Application note 3193
Effective March 2019
Supersedes July 2015
BUSSMANN
For UL Type 1, 2, 3 and
Type 4 component assembly,
and data signal surge protective devices
SERIES
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
Effective March 2019
Contents
Description Page
Description Page
The need for surge protection
UL Listed 4th Edition open Type 1 DIN-Rail high SCCR SPDs
•
Case studies for industrial and commercial applications
3
•
Causes and relevance of transients and surges
3
•
Damage caused by transients and surges
3
UL SPD Types and NEC locations
•
UL SPD standards
4
•
NEC SPD installation/connection
4
•
Applying UL SPD Types by NEC location
• NEC 285 Type 1
5
5
•
NEC 285 Type 2
5
•
NEC 285 Type 3
5
Bussmann series UL power, control and data signal SPD
product lineup
•
•
UL Type 1 NEMA 1 and NEMA 4X SPDs
• BSPD high surge current capacity Type 1 and Type 2
BSPA Type 1 and Type 2
6
•
SurgePOD PRO Type 1
6
•
•
Non SCCR power and control
(blue label Type 4 component assembly)
UL 497B DIN-Rail and data signal SPDs
• 4 wire universal/twisted pair
•
RJ45/Ethernet video/data cable
6
6
6
2-Pole 26-27
•
3-Pole 28-29
•
4-Pole 30-31
UL Recognized Type 4 component assembly DIN-Rail nonSCCR AC/DC power and control SPDs
•
1-Pole UL low voltage power SPDs
32-33
•
2-Pole UL low voltage control SPDs
34-35
UL Listed data signal SPDs for telecom and instrumentation
data signal applications
6
UL SPD selection flowchart for ≤ 600 V systems
7
UL SPD types, markets and applications table
8
•
1-Pole 24-25
•
6
•
UL DIN-Rail SPDs
• High SCCR open Type 1 (black label)
•
Applying UL Type 1, Type 2 and Type 4 component
assembly SPDs by surge current capacity (Imax) 8
NEC surge protection requirements
9
•
Overview 36
•
DIN-Rail universal 4 wire SPDs
•
DIN-Rail RJ45/Ethernet cable SPD
Frequently Asked Questions (FAQs)
Installing surge protective devices in accordance
with NEC Article 240 and Feeder Tap Rule
Electrical system connections for SPDs
Installing UL Type 1 and Type 2 SPDs
10-11
12
Type 1 NEMA 1 and NEMA 4X UL Listed SPDs
•
BSPD 120-400 kA surge current capacity
14-17
•
BSPA 50-200 kA surge current capacity
18-21
•
SurgePOD PRO, 40 kA surge current capacity
22-23
2
Eaton.com/bussmannseries
ANSI/UL 1449 short-circuit current rating and
NEC Article 285.6
SPD glossary
Online resources — visit Eaton.com/bussmannseries
36-37
38
39-43
44
45
46-47
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
The need for surge protection
Effective March 2019
•
Plant Services Magazine – 35% of lost production hours can be
attributed to transient voltage problems.
•
Florida Light and Power 1999 Study — Sources of Facility Surge
and Overvoltage Events:
• ~60% Internally Generated
•
~40% Externally Generated
Causes and relevance of transients and surges
•
Lightning strikes — Large scale impact, high current and
voltage, but least common occurrence.
•
Power switching — Increasing occurrences:
• Utility and customer load switching – Motors, large loads,
faults, capacitor banks, fuse and circuit breaker operation*, etc.
•
Today’s world is full of electronic products and electrical devices that
are susceptible to damage from overvoltage surges.
Surges caused by static discharge, capacitive and inductive loads or
lightning can quickly destroy sophisticated electronic equipment and
components used in industrial and commercial applications. These
surges cripple operations – particularly the data and communication
systems that virtually every enterprise relies upon today, including
UL® 508A panels with their reliance on control circuits.
Also, the NEC requires a listed SPD to be installed on various
equipment types including elevators on emergency systems [NEC
620.51(E)], critical operations data systems (NEC 645.18), industrial
machinery with safety interlock circuits (NEC 670.6), wind electric
systems [NEC 694.7(D)], fire pump controllers (NEC 695.15),
emergency panelboards and switchboards (NEC 700.8) and critical
operations power systems (NEC 708.20).
Source switching — Smart grid, gensets, photovoltaic power
systems and wind power generation, etc.
* During overcurrent events, both circuit breakers and fuses can produce arc
voltages 2-3 times the system voltage in accordance with the UL standards.
Damage caused by transients and surges
•
Disruptive – A voltage transient enters an electronic component
and it interprets the transient as a valid logic command, resulting
in system lock-up, malfunction, faulty output or corrupted files.
•
Dissipative – Associated with short duration repetitive low energy
level surges, resulting in equipment failure over time including
electronic components, ballasts, motors and controllers, service
entrance equipment, panelboards and switchgear.
•
Destructive – Associated with high level energy surges, resulting
in immediate equipment failure including electronic components,
ballasts, motors and controllers, service entrance equipment,
panelboards and switchgear.
We offer a wide selection of Bussmann™ series surge protection
products that help assure power quality by eliminating damaging
surges.
Case studies and references for industrial and commercial
applications
•
G.W. Allen and D. Segall with IBM – Two year study at over 200
locations in 25 cities – 88.5% of AC power problems are transient
voltage related.
•
2011 Erimar Systems Integration — A lightning strike entered the
metals fabricating facility and destroyed $20,000 worth of control
panels, electrical infrastructure and Cisco infrastructure. Loss of
data system also cost 11 days of production.
•
IEEE Emerald Book and NFPA 780 both recommend using
surge protection as a part of a building’s lightning protection
system. Suppressors at the service entrance only reduce, but not
completely eliminate, the high-energy transient. A second surge
protective device must be applied upstream of critical equipment.
All SPDs should comply with UL 1449 4th Edition or later.
•
1999-2001 Electric Power Research Institute (EPRI) Study –
Concluded downtime from power sags, surges and transients
cost US industry:
• $50 Billion+ in 1999
•
$100 Billion+ in 2000
•
$200 Billion+ in 2001
•
Continues to escalate as more electronic equipment is used
Internal damage — PCB destroyed by a surge
Service entrance destroyed by a surge
Eaton.com/bussmannseries
3
Application Note 3193
Effective March 2019
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
UL SPD types and NEC locations
NEC SPD installation/connection
Both UL and the NEC define surge protective device Types, but they
are NOT the same. They differ significantly by the following.
NEC Article 285, Surge-Protective Devices (SPDs), 1 kV or Less
states the following on where in an electrical system SPDs can be
installed and or connected.
UL SPD standards
SURGE PROTECTIVE DEVICES — UL 1449, 4th Edition, Section 1
effective August 20, 2014, states the following on UL Types covering
enclosed and open-type Surge Protective Devices (SPDs) designed
for repeated limiting of transient voltage surges as specified in the
standard on 50 or 60 Hz power circuits not exceeding 1000 V and for
PV applications up to 1500 Vdc and designated as follows:
Type 1 — One port, permanently connected SPDs, except for
watt-hour meter socket enclosures, intended for installation
between the secondary of the service transformer and the line
side of the service equipment overcurrent device, as well as
the load side, including watt-hour meter socket enclosures and
Molded Case SPDs intended to be installed without an external
overcurrent protective device. Type 1 SPDs for use in PV systems
can be connected between the PV array and the main service
disconnect.
Type 2 — Permanently connected SPDs intended for installation
on the load side of the service equipment overcurrent device;
including SPDs located at the branch panel and Molded Case
SPDs.
II. Installing SPDs
285.13 Type 4 and Other Component Type SPDs. Type 4 component
assemblies and other component type SPDs shall only be installed
by the equipment manufacturer.
III. Connecting SPDs
285.21 Connection. Where an SPD device is installed, it shall comply
with 285.23 through 285.28.
285.23 Type 1 SPDs. Type 1 SPDs shall be installed in accordance
with 285.23(A) and (B).
(A) Installation. Type 1 SPDs shall be installed as follows:
(1) Type 1 SPDs shall be permitted to be connected to the
supply side of the service disconnect as permitted in 230.82(4)
or
(2) Type 1 SPDs shall be permitted to be connected as specified
in 285.24.
(B) At the Service. When installed at services, Type 1 SPDs shall
be connected to one of the following:
(1) Grounded service conductor
Type 3 — Point of utilization SPDs, installed at a minimum
conductor length of 10 meters (30 feet) from the electrical
service panel to the point of utilization, for example cord
connected, direct plug-in, receptacle type and SPDs installed at
the utilization equipment being protected. See marking in 80.3.
The distance (10 meters) is exclusive of conductors provided with
or used to attach SPDs.
285.24 Type 2 SPDs. Type 2 SPDs shall be installed in accordance
with 285.24(A) through (C).
Type 4 Component Assemblies — Component assembly
consisting of one or more Type 5 components together with a
disconnect (integral or external) or a means of complying with the
limited current tests in 44.4.
(A) Service-Supplied Building or Structure. Type 2 SPDs shall be
connected anywhere on the loadside of a service disconnect
overcurrent device required in 230.91, unless installed in
accordance with 230.82(8).
Type 1, 2, 3 Component Assemblies — Consists of a Type 4
component assembly with internal or external short circuit
protection.
(B) Feeder-Supplied Building or Structure. Type 2 SPDs shall be
connected at the building or structure anywhere on the loadside of
the first overcurrent device at the building or structure.
Type 5 — Discrete component surge suppressors, such as
MOVs that may be mounted on a PWB, connected by its leads
or provided within an enclosure with mounting means and wiring
terminations.
(C) Separately Derived System. The SPD shall be connected on
the loadside of the first overcurrent device in a separately derived
system.
(2) Grounding electrode conductor
(3) Grounding electrode for the service
(4) Equipment grounding terminal in the service equipment
285.25 Type 3 SPDs. Type 3 SPDs shall be permitted to be installed
on the loadside of branch-circuit overcurrent protection up to the
equipment served. If included in the manufacturer’s instructions, the
Type 3 SPD connection shall be a minimum 10 m (30 ft) of conductor
distance from the service or separately derived system disconnect.
285.26 Conductor Size. Line and grounding conductors shall not be
smaller than 14 AWG copper or 12 AWG aluminum.
285.27 Connection Between Conductors. An SPD shall be permitted
to be connected between any two conductors — ungrounded
conductor(s), grounded conductor, equipment grounding conductor,
or grounding electrode conductor. The grounded conductor and the
equipment grounding conductor shall be interconnected only by the
normal operation of the SPD during a surge.
285.28 Grounding Electrode Conductor Connections and Enclosures.
Except as indicated in this article, SPD grounding connections shall
be made as specified in Article 250, Part III. Grounding electrode
conductors installed in metal enclosures shall comply with
250.64(E).
4
Eaton.com/bussmannseries
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
Effective March 2019
Applying UL SPD Types by NEC location
Outside and service
entrance
Feeders and short
branch circuits
Outlets and long
branch circuits
Note: Only Type 1 SPDs
permitted to be installed
upstream of the service
entrance overcurrent
protective device
Pad-mounted
transformer
NEC 285 Type 1
Type 1 SPDs shall be installed as:
Service entrance
(1) Type 1 SPDs shall be
permitted to be connected to
the supply side of the service
disconnect as permitted
in 230.82(4) or... as well
as the loadside, including
watt-hour meter socket
enclosures and intended to be
installed without an external
overcurrent protective device.
(2) Type 1 SPDs shall be
permitted to be connected as
specified in 285.24.
Feeder circuit
Branch circuit
UL Type 1 SPD
Lineside or loadside
of service entrance
overcurrent protective device
Device
NEC 285 Type 2 *
Type 2 SPDs shall be installed in accordance with 285.24(A) through (C).
(A) Service-Supplied Building or Structure. Type 2 SPDs shall be
connected anywhere on the loadside of a service disconnect
overcurrent device required in 230.91, unless installed in
accordance with 230.82(8).
(B) Feeder-Supplied Building or Structure. Type 2 SPDs shall be
connected at the building or structure anywhere on the loadside
of the first overcurrent device at the building or structure.
UL Type 1 SPD
Loadside
of service entrance
overcurrent protective device
UL Type 1 SPD
≥ 30 feet (10 m)
from the service entrance
overcurrent protective device
(C) Separately Derived System. The SPD shall be connected on the
loadside of the first overcurrent device in a separately derived
system.
NEC 285 Type 3*
Type 3 SPDs shall be permitted to be installed on the loadside of
branch-circuit overcurrent protection up to the equipment served.
If included in the manufacturer’s instructions, the Type 3 SPD
connection shall be a minimum 10 m (30 ft) of conductor distance
from the service or separately derived system disconnect.
UL open Type 1† SPD
Loadside
of service entrance
overcurrent protective device
* Includes Type 2 or Type 4 component assemblies.
UL open Type 1† and
Type 4† component
assembly SPDs
≥ 30 feet (10 m)
from the service entrance
overcurrent protective device
† Must be installed in an enclosure.
Eaton.com/bussmannseries
5
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
Effective March 2019
Bussmann series UL power, control and data signal SPD product lineup
This guide suggests which series best meets your needs and applications.
Market
Commercial/industrial
Main switchgear, switchboard, motor control
center, outdoor load
Equipment type
NEC SPD requirements*
620.51(E), 645.18, 694.7(D), 700.8
IEEE exposure category
C
Typical panel amps
Peak kA rating per phase
UL 1449/CSA type
UL 1283 EMI/RFI filtering**
NEMA Enclosure
Agency information
OEMs/UL 508A panel shops
Control panel, point of use
670.6, 695.15, 708.20
A
Unlimited
Up to 4000
120-400
50—200
40
50
200
200
200
200
120—600 Vac
120—600 Vac
120—600 Vac
120—600 Vac
1 and 2
1 and 2
1
1
SCCR (kA)
Nominal voltage
Light commercial
Distribution panelboard,
subpanel, loadcenter
620.51(E), 645.18,
695.15, 700.8, 708.20
B
Up to 1000
Up to 200
Single-phase, point
of use
40 / N/A
50 dB
40 dB
N/A
N/A
N/A
24-120 Vac
24-200 Vdc
4 component
assemblies
N/A
1 and 4X
4X
4X
cULus/CSA/RoHS
cULus/CSA/RoHS
cULus/CSA/RoHS
N/A
UL Listed open Type 1/
CSA/RoHS
5
N/A
UL/cUL/CSA/KEMA/
RoHS
5
Warranty (years)
10
5
2
Side-mount
Side-mount
Rear nipple
DIN-Rail
DIN-Rail
Yes-LED
Yes-LED
Yes-LED
Yes-Local
Yes-Local
Audible alarm
Yes
Yes
No
No
No
Form C contacts
Yes
Yes
No
Yes - standard
Yes - standard
Surge counter
Yes
No
No
No
No
EMI/RFI filtering
Yes
Yes
No
No
No
BSPD
BSPA
SurgePOD PRO
BSPM1A/BSPH2A
10209
10661
10033
BSPMA
10771 (1-pole), 10772
(2-pole), 10773 (3-pole),
107744 (4-pole)
Features/mounting
Status indication
Options
Product family
Data sheet
2056 (1-pole),
2057 (2-pole)
* Product family and rating is dependent upon the application and exposure to surge activity.
** Selecting filtering option changes normally Type 1 SPDs to Type 2.
† With online registration.
†† Available on some models.
Bussmann series UL 497B data signal surge protective devices
These surge protectors complement any power protection SPDs by protecting data signal lines. See pages 36 to 38 for details.
DIN-Rail universal 4 wire
•
6
Eaton.com/bussmannseries
For nominal 5 and 24 V systems
DIN-Rail RJ45/Ethernet cable
•
For nominal voltages up to 48 V
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
Effective March 2019
UL SPD selection flowchart for ≤600 V systems
Step 1. Determine location and suitable type*
Start
Service
entrance
lineside
or loadside
of
OCPD?
No
Yes
Surge current
capacity 50 to 200kA
and surge counter
required?
Inside
of
enclosure?
UL 96A std.
installation
requirements
on lightning
protection
systems?
No
Install
Type 1 BSPA,
go to pages
18 to 21
No
UL 508A
industrial control
panel?
Install
Type 1 or Type 2 BSPD,
go to pages
14 to 17
No
Yes
Yes
Yes
Yes
No
Stand alone
equipment such
as, panelboards,
switchboards
or motor control
centers?
No
Call Applications
Engineering toll free
1-855-BUSSMANN
No
Non UL panel?
Yes
Yes
Go to Step 2
* If EMI/RFI filtering is required, select the BSPD or BSPA configuration required for the system.
Step 2. Determine Type 1, and DIN-Rail open Type 1 and Type 4 (Type 2 and 3 applications) SPDs
Start
SCCR power
application?
Yes
Install
Type 1 BSPA
go to pages
18 to 21
or
Open Type 1 black label
SCCR DIN-Rail SPD,
go to pages
24 to 31
No
≤30’ (10 m)
from
service entrance
disconnect?
No
Yes
Yes
75-120 Vac
or
100-200 Vdc
Install
Type 4 component
assembly blue label
low voltage SPD,
go to pages
34 to 35
Yes
No
No
24-150 Vac/dc?
Call Applications
Engineering toll free
1-855-BUSSMANN
Install
Type 4 component
assembly blue label
low voltage SPD,
go to pages
32 to 33
Eaton.com/bussmannseries
7
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
Effective March 2019
UL SPD types, markets and applications
UL Listed Type 1 and Type 2
Markets
UL Listed Type 1 and Type 2 SPDs
SCCR rated 120-600 Vac
MOV and thermal disconnect technology
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Pump panels requiring SCCR ratings
Service panels
Elevator control
Emergency generator control
Feeders
Fire pump control
HVAC
Lighting panels
Main switchgear
Motor control centers
Step down transformer primary
UL 508A panels requiring SCCR ratings
UPS
Installation on outside of enclosure or
ahead of service entrance disconnect
• Emergency generator control
• Feeders
• HVAC
• Main switchgear
• Power distribution unit
• Remote power panel
• UPS
• Emergency generator control
• HVAC
• Lighting panels
• Main switchgear
• Motor control centers
• Step down transformer primary
• UL 508A panels requiring SCCR ratings
• UPS
• VFD
Agriculture
Commercial/
institutional
Contractor
Data centers
Industrial
• Installation on outside of enclosure
• UL 508A panels requiring SCCR ratings
OEM
• Emergency generator control
• Lighting panels
• Main switchgear
• Motor control centers
• Step down transformer primary
• UL 508A panels requiring SCCR ratings
• UPS
• VFD
• Service entrance
Oil and gas
Residential
•
UL 508A shops
Waste water/
water treatment
•
•
•
UL Types
DIN-Rail UL Listed open Type 1 and Recognized Type 4 component assembly
Type 4 component assembly power and
UL Listed open Type 1 SPDs
control blue label SPDs
SCCR rated black label 120-600 Vac
24-120 Vac, 24-200 Vdc
MOV technology
MOV or hybrid technology
• AC/DC Pump panels not requiring
• Pump panels requiring SCCR ratings
SCCR ratings
• Elevator control
• Emergency generator control
• Fire pump control
• HVAC
• Mission critical panelboards
• UPS
• UL 508A panels requiring SCCR ratings
• VFD
•
•
•
•
•
•
•
Elevator control
Emergency generator control
Fire alarm
Fire pump control
HVAC
Security systems
UPS
—
•
•
•
•
•
Emergency generator control
HVAC
Power distribution unit
Remote power panel
UPS
—
•
•
•
•
Emergency generator control
HVAC
Servers
UPS
• Conveyor systems
• Crane control
• HVAC
• Power supplies
• Step down transformer primary
• UL 508A panels requiring SCCR ratings
• VFD
•
•
•
•
•
•
Discrete control
HMI
HVAC
PLCs
Power supplies
Sensors
• I/Os
• PLCs
• Power supplies
• Step down transformer primary
• UL 508A panels requiring SCCR ratings
• VFD
•
•
•
•
•
•
HMI
I/Os
PLCs
Power supplies
Sensors
Step down transformer primary
• Conveyor systems
• Crane control
• Power supplies
• Step down transformer primary
• UL 508A panels requiring SCCR ratings
• VFD
•
•
•
•
•
Discrete control
HMI
PLCs
Power supplies
Sensors
N/A
• I/Os
• Installation on the lineside of the
Installation on outside or inside of
enclosure disconnect OCPD
enclosure or ahead of service entrance • PLC
disconnect
• Power supplies
• Step down transformer primary
• VFD
Main switchgear
• Control panels
Motor control centers
• UL 508A panels requiring SCCR ratings
UL 508A panels requiring SCCR ratings • VFD
N/A
•
•
•
•
•
•
HMI
I/Os
PLCs
Power supplies
Sensors
Step down transformer primary
• PLC
• Power supplies
• Sensors
Applying UL Type 1, Type 2 and Type 4 SPDs by surge current capacity (Imax)
Bussmann series product
BSPD Type 1 and Type 2
BSPD Type 2
BSPA Type 1 and Type 2
SurgePOD™ PRO Type 1
1-, 2-, 3- and 4-pole high SCCR open Type 1 (black label)
1-pole non SCCR Type 4 for Type 2 application (blue label)
2-pole non SCCR Type 4 for Type 3 application (blue label)
* Total discharge current.
8
Eaton.com/bussmannseries
Installation location
Switchboards, service entrance
Large panelboards
Panelboards, control panels
Panelboards, control panels
Control panels
Control panels (power)
Control panels (control)
Surge current capacity (Imax)
200 kA to 400 kA
120 kA to 200 kA
50 kA to 200 kA
40 kA
50 kA
40 kA
2-4 kA*
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
NEC surge protection requirements
In recent years, with the proliferation of electronics and devices
sensitive to transient voltage and current surges, the need for
surge protection has become increasingly important, particularly for
equipment and systems used for life safety or where reliability is
highly critical.
The NEC recognizes this need and has adopted the following
provisions where surge protection is required.
Regardless of whether surge protection is required or not, it’s
prudent to have surge protection on all circuits as many portable
appliances and communications devices with sensitive electronics
may be powered from circuits where transient overvoltage surge is
an issue.
Effective March 2019
694.7(D) “A surge protection device shall be installed between
a wind electric system and any loads served by the premises
electrical system.”
Added in 2011, surge
protective devices should
be on the circuit serving the
wind electric system or on the
service disconnect’s loadside.
695.15 “A listed surge protection device shall be installed in or
on the fire pump controller.”
Added in 2017, this NEC
provision requires a listed SPD to
be installed in or on the fire pump
controller to provide protection. A
study commissioned by the Fire
Protection Research Foundation
found that 12% of those surveyed
had surges damaging their fire
pumps.
Below are the major NEC Sections requiring surge protection. On
page two is a selection chart for Bussmann series surge protective
devices (SPD)based upon application.
620.51(E) “Where any of the disconnecting means in 620.51 has
been designated as supplying an emergency system load, surge
protection shall be provided.”
Added in 2017, this section was
added to address emergency
system loads such as elevators,
escalators, moving sidewalks,
chairlifts and associated
equipment.
700.8 “A listed SPD shall be installed in or on all emergency
systems switchboards and panelboards.”
Added in 2014, this requirement
helps ensure emergency electrical
systems continue powering vital,
life-safety loads in the event of
damaging surges.
645.18 “Surge protection shall be provided for Critical
Operations Data Systems.”
Added in 2017, Critical Operation
Data Systems is defined by the
NEC as “Information technology
equipment systems that require
continuous operation for public
safety, emergency management,
national security or business
continuity.”
670.6 “Industrial machinery with safety interlock circuits shall
have surge protection installed.”
708.20 “Surge protection devices shall be provided at all facility
voltage distribution levels.”
Added in 2008, Critical Operation
Power Systems (COPS) are
power systems that can include
HVAC, fire alarms, security,
communications and signaling
for designated critical operations
areas. Surge protection helps
ensure these systems will operate
as intended in an emergency
situation.
Added in 2017, this section was
added to address the concern
with safety interlock failure on
machinery causing a safety
risk to operators who may not
be aware of disabled safety
mechanisms.
Eaton.com/bussmannseries
9
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
Effective March 2019
Electrical system connections for SPDs
The following diagrams show the SPD connection points for the
various electrical systems likely to be encountered, along with the
Bussmann series SPD models that may be applied.
Understanding the following points will help ensure that the correct
surge protective device is specified for the electrical system or
equipment.
•
Typical North American electrical systems include single-phase,
split-phase, Delta and Wye.
•
Selecting the wrong SPD generally arises from misunderstanding
the nominal system voltage, ground and neutral connections.
•
General convention has it that a “ground” wire is not counted as
a wire in the system description (e.g., 3 wire, 4 wire, etc.), but it
is counted as a connection point if the selected SPD has a ground
wire.
•
Selection of a device voltage rating for Wye systems must be
based upon its nominal system voltage rating and not on the legto-leg voltages in the Wye.
•
Bonded N-G configurations do not require protection at the
service entrance transformer, but protection is suggested in
downstream bonded N-G systems if the length of conductor
making the bond is greater than 10 feet (3 m)*.
The following are the BSPD, BSPA and SurgePOD PRO catalog
numbers, and the electrical systems and voltages to which they
can be applied along with any notes that help in understanding the
context of the application.
The examples show circuit breakers as the most typical means of
making connections to the panel phases, although connection with
fusible switches and lug connections are permitted, provided the
terminals are rated for the 10 AWG conductors used by the BSPD,
BSPA and SurgePOD SPDs.
Note: UL does not require using overcurrent protective devices
such as circuit breakers or fused switches as the SPD’s thermal
disconnect technology will safely take the SPD offline in the event
of a failure. Use of these devices is for facilitating connection to the
panel buses and installation convenience.
Contact Bussmann Application Engineering for electrical systems not
covered in this section.
* See FAQ #25 for more information.
Two wire single-phase,
2 connection points
Three wire split-phase/
2-pole, 3 connection points
Three wire split-phase/
2-pole, 3 connection points
Application: Sub-panel or feeder
panel
Application: Service entrance
panel
Application: Sub-panel or feeder
panel
Volts: 120, 240 (L-N)
Volts: 120, 240 (L-N)
Note: Must be installed within
10 feet (3 m) of a bonded neutral
ground connection per IEEE
C62.41-1991.
Note: Installation for where the
SPD is greater than 10 feet (3 m)
from a bonded neutral-ground
connection.
Volts: 120, 240 (L-N), 240, 480
(L1-L2)
Note: Installation at or less
than 10 feet (3 m) from the
transformer and within 10 feet (3
m) of a bonded-neutral ground
connection.
G
Dedicated one-pole
circuit breaker,
or one-pole
fusible switch
L1
N
L2
Dedicated one-pole
circuit breaker,
or one-pole
fusible switch
Three wire split-phase/
2-pole plus ground,
4 connection points
Application: Service entrance
equipment
Volts: 120, 240 (L-N), 240 (L1L2)
Note: Installation where greater
than 10 feet (3 m) of a bondedneutral ground connection.
Dedicated two-pole
common trip
circuit breaker, or
two-pole
fusible switch
Dedicated two-pole
common trip
circuit breaker, or
two-pole
fusible switch
Black
Black
Black
Black
Black
Black
White
White
White
White
L1
L1
L1
Green
L1
G
G
G
N
L2
N
N
G
SPD catalog numbers:
••
BSPA
••
••
SPD catalog numbers:
••
Specify from build-a-code
catalog number system
SurgePOD™ PRO
••
10
SPP40SP1120SN
Eaton.com/bussmannseries
BSPA
••
L2
Green
SPD catalog numbers:
••
Specify from build-a-code
catalog number system
BSPA
••
••
Specify from build-a-code
catalog number system
SurgePOD PRO
••
SPP40SP2240PN
N
SPD catalog numbers:
••
BSPA
••
Specify from build-a-code
catalog number system
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
Three wire split-phase/
2-pole plus ground,
4 connection points
Application: Sub-panel or feeder
panel
Volts: 120, 240 (L-N), 240 (L1L2)
Note: For installation greater
than 10 feet (3 m) of a bondedneutral ground connection.
Effective March 2019
Three wire Wye plus ground,
4 connection points
Four wire Wye plus ground,
5 connection points
Four wire Wye plus ground,
5 connection points
Application: Sub-panel or feeder
panel
Application: Service entrance
equipment
Application: Sub-panel or feeder
panel
Volts: 208, 480, 600 (L-L)
Volts: 120, 127, 277, 347 (L-N),
208, 220, 480, 600 (L-L)
Volts: 120, 127, 277, 347 (L-N),
208, 220, 480, 600 (L-L)
Note: Common system
configuration with Neutral pulled
into facility and bonded to
ground.
Note: Common system
configuration with Neutral pulled
into facility and bonded to
ground.
Note: A common MCC
configuration for pumping and
water/waste water treatment.
L 1 N L2
L1
N
L2
Dedicated two-pole
common trip
circuit breaker, or
two-pole
fusible switch
Dedicated three-pole
common trip circuit
breaker, or three-pole
fusible switch
Black
Black
White
L2
Black
Dedicated three-pole
common trip circuit
breaker, or three-pole
fusible switch
Black
Black
Black
White
Black
L1
Black
Green
L1
L2
L3
Green
G
SPD catalog numbers:
BSPA
••
L3
G
N
G
N
L1
••
L2
Green
Black
White
G
Dedicated three-pole
common trip circuit
breaker, or three-pole
fusible switch
Black
Black
L1
L3
L3
Green
N
SPD catalog numbers:
••
Specify from build-a-code
catalog number system
BSPA
••
••
Three wire Delta plus ground,
4 connection points
L2
Specify from build-a-code
catalog number system
••
••
SPP40SP3208WYG
••
SPP40SP3480WYG
••
SPP40SP3600WYG
BSPA
••
••
Specify from build-a-code
catalog number system
BSPA
••
SPD catalog numbers:
SurgePOD PRO
••
SPD catalog numbers:
••
Specify from build-a-code
catalog number system
BSPD
••
Specify from build-a-code
catalog number system
BSPD
••
Specify from build-a-code
catalog number system
Application: Service entrance
equipment, sub-panel or feeder
panel
Volts: 240, 480, 600 (L-L)
Dedicated three-pole
common trip circuit
breaker, or three-pole
fusible switch
Black
Black
Black
L1
L2
L3
Green
G
SPD catalog numbers:
••
BSPA
••
••
Specify from build-a-code
catalog number system
BSPD
••
Specify from build-a-code
catalog number system
Eaton.com/bussmannseries
11
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
Effective March 2019
Installing UL Type 1 and Type 2 SPDs
While differences will arise in the installation of different SPD
models on various electrical systems and locations inside an
electrical system, the following are general procedures and
considerations to follow.
At the start of this section are diagrams indicating the connection
points for the Type 1 and Type 2 SPDs contained in this guide and
the electrical system to which they can be connected.
Installation steps
1. Inspect the electrical panelboard to be sure it is properly grounded
in accordance with prevailing code requirements.
2. Inspect the SPD unit to determine:
•
It has the correct nominal system and MCOV voltage rating
and is the correct configuration for the installation.
•
It is not damaged; If the unit is damaged or not correct for the
system, do not install it. Secure a proper replacement before
proceeding with the installation.
3. Deenergize panelboard and follow established lockout / tagout
procedures. Remove panelboard cover(s) to gain access to the
interior. Check to make sure the entire panelboard is deenergized
before proceeding.
4. Select a location on the panelboard that accommodates mounting
the SPD and allows the leads to reach their intended connection
points. Be sure the SPD unit can be positioned so that the LED
status indicator(s) is visible. A location that permits the shortest
lead lengths is preferred.
5. Remove a 3/4” knockout or make a 1-1/16” diameter hole where
the SPD is to be mounted.
6. Remove the locknut from the unit and insert leads through the
panelboard wall being careful not to damage the conductor
insulation. (For NEMA 4X installations, use appropriate gaskets or
sealing means to retain the NEMA 4X rating on the installation —
see Figure 1.) Reinstall locknut and tighten to specified torque.
Installation option A: using feed through lugs
7. Determine if the lugs are rated for stranded 10 AWG conductors.
If lugs are not rated for this size conductor, DO NOT install the
SPD unit, or replace lugs with appropriately rated lugs before
proceeding, or install the unit using installation option B.
8. Route and trim the leads so they reach their connection points
with the least amount of length.
9. Strip the lead ends to lug manufacturer’s specifications, insert
them into the appropriate ports and torque to the specified value
NOTE: DO NOT install more than one lead into the same lug
port.
Go to step 13.
Installation option B: circuit breaker or fused switch
When using a circuit breaker or fused switch, see suggested
ampacities in Table A for the SPD family product being installed.
10. Place in the OFF position and install a new, dedicated common
trip circuit breaker or fusible switch with fuses sized by SPD
family and located as close as possible to where the SPD unit is
mounted.
11. Route and trim the leads so they reach their intended connection
points with the least amount of length.
12. Strip the lead end to fit the connection points, insert into the
terminal lugs and torque to the specified value.
Go to step 13.
Finishing the installation
13. Reinstall the panelboard cover(s).
14. Test the SPD installation by energizing the panelboard and
placing the circuit breaker or fusible switch (requires fuses to be
installed) in the ON position. Verify the LED status indicators are
functioning according to the installed SPD model. If LEDs are
not properly displaying for a correctly installed and functioning
SPD (per model), see the troubleshooting procedures for
possible causes and remedy.
NEMA 4X installation requires appropriate
customer-supplied gasket between
the SPD and enclosure wall.
Tighten locknut to
20.3 lb-in (2.3 N•m)
Suggested minimum ampacity
SPD family
SurgePOD PRO (SPP)
BSPA
BSPD
Fused switch
30 A
60 A
100 A
Circuit breaker
30 A
30 A
30 A
Table A — Circuit breaker and fused switch sizing guide
Figure 1.
If using conduit, keep the run as straight and short as possible, and
avoid using 90 elbows.
NOTE: For optimum performance, trim the leads to the shortest
length possible and avoid sharp bends. Make electrical connections
appropriate for the application.
12
Eaton.com/bussmannseries
Application Note 3193
UL Type 1, 2, 3 and Type 4 component assembly,
and data signal surge protective devices
Effective March 2019
BSPD, BSPA and SurgePOD PRO comparisons
SPD model / color
Product warranty*
System types
BSPD — grey
Commercial and industrial
with high surge current
10 years
Delta and Wye
Nominal system voltages
120/208, 240, 277/480, 480,
600
Max. continuous operating AC voltage (MCOV) [VC]
Sized to nominal voltage
(150 V to 840 V)
200 kA
20 kA
120, 200, 300, 400 kA
3, 5 Wires
Yes