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SECTION 264313 – TRANSIENT-VOLTAGE SUPPRESSION FOR LOW-VOLTAGE ELECTRICAL
POWER CIRCUITS
PART 1 - GENERAL
1.1
RELATED DOCUMENTS
A.
Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 01 Specification Sections, apply to this Section.
B.
The Institute of Electrical and Electronics Engineers, Inc.
1.
2.
3.
C.
InterNational Electrical Testing Association
1.
D.
NFPA 70: National Electrical Code
Underwriters Laboratories Inc.
1.
2.
1.2
NEMA 250: Enclosures for Electrical Equipment (1000 Volts Maximum)
NEMA LS 1: Low Voltage Surge Protection Devices
NFPA
1.
F.
NETA ATS: Acceptance Testing Specifications: "Surge Arresters, Low-Voltage Surge
Protection Devices"
National Electrical Manufacturers Association
1.
2.
E.
IEEE C62.41: IEEE Guide on the Surge Environment in Low-Voltage (1000 V and
Less) AC Power Circuits (ANSI)
IEEE C62.41.2: IEEE Recommended Practice on Characterization of Surges in LowVoltage (1000 V and Less) AC Power Circuits (ANSI)
IEEE C62.45: IEEE Recommended Practice on Surge Testing for Equipment Connected
to Low-Voltage (1000 V and Less) AC Power Circuits (ANSI)
UL 1283: Electromagnetic Interference Filters
UL 1449: Transient Voltage Surge Suppressors
SUMMARY
A.
Section includes field-mounted high-energy transient voltage surge suppressor devices (TVSS)
for low-voltage (120 to 600 V) power distribution and control equipment application. The
TVSS systems shall provide effective high-energy surge current diversion, sine wave tracking
for electrical line noise filtering, and be suitable for application in ANSI/IEEE C62.41 Category
A, B, and C environments as tested by ANSI/IEEE C62.11, C62.45, and MIL-STD-220A.
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B.
The TVSS devices specified in this section shall be connected in parallel with the protected
system. No series connected elements shall be used which limit the load current or kVA
capability of the protected system.
C.
TVSS devices that are factory installed in switchboards, switchgear, and panelboards are not
acceptable.
D.
Related Sections:
1.
1.3
Division 26 Section "Wiring Devices" for devices with integral TVSS.
DEFINITIONS
A.
ATS: Acceptance Testing Specifications.
B.
SVR: Suppressed voltage rating.
C.
TVSS: Transient voltage surge suppressor(s), both singular and plural; also, transient voltage
surge suppression.
1.4
ACTION SUBMITTALS
A.
1.5
Product Data: For each type of product indicated. Include rated capacities, operating weights,
electrical characteristics, furnished specialties, and accessories.
INFORMATIONAL SUBMITTALS
A.
Product Certificates: For TVSS devices, from manufacturer.
B.
Field quality-control reports.
C.
Warranties: Sample of special warranties.
1.6
CLOSEOUT SUBMITTALS
A.
1.7
Operation and Maintenance Data: For TVSS devices to include in emergency, operation, and
maintenance manuals.
MAINTENANCE MATERIAL SUBMITTALS
A.
Furnish extra materials that match products installed and that are packaged with protective
covering for storage and identified with labels describing contents.
1.
Replaceable Protection Modules: One of each size and type installed.
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QUALITY ASSURANCE
A.
Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70,
by a testing agency, and marked for intended location and application.
B.
Comply with ANSI/IEEE C62.41 and tested according to ANSI/IEEE C62.11 and C62.45.
C.
Comply with NEMA LS 1 – Low Voltage Surge Protection Devices.
D.
Comply with NFPA 70 – The National Electrical Code.
E.
Comply with UL 1449, Second Edition – Standard for Transient Voltage Surge Suppressions.
Permanently affix the surge ratings to the TVSS device.
1.9
PROJECT CONDITIONS
A.
Interruption of Existing Electrical Service: Do not interrupt electrical service to all or any
portion of facilities occupied by Owner or others unless permitted under the following
conditions and then only after arranging to provide temporary electrical service according to
requirements indicated:
1.
2.
3.
B.
Service Conditions: Rate TVSS devices for continuous operation under the following
conditions unless otherwise indicated:
1.
2.
3.
4.
5.
6.
7.
1.10
Prepare a detailed Method of Procedure (MOP) for each outage as described in Division
26 Section “Common Work Results for Electrical.”
Notify Construction Manager no fewer than 7 days in advance of proposed electrical
service interruptions.
Do not proceed with interruption of electrical service without Construction Manager's
written permission.
Maximum Continuous Operating Voltage: Not less than 115 percent of nominal system
operating voltage.
Operating Temperature: -40 to 140 deg F (-40 to 60 deg C).
Humidity: 0 to 95 percent, noncondensing.
Altitude: Less than 18,000 feet above sea level.
Audible Noise: Less than 45 dBa at 5 feet.
Operating Frequency: 47 to 63 Hz.
Magnetic Fields: No appreciable magnetic fields shall be generated that would limit use
inside computer rooms.
COORDINATION
A.
Coordinate location of field-mounted TVSS devices to allow adequate clearances for
maintenance while maintaining the shortest conductor length possible for connection of the unit.
B.
Coordinate TVSS devices with Division 26 Section "Electrical Power Monitoring and Control."
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WARRANTY
A.
The manufacturer shall provide as a minimum a full 5 year parts and labor warranty from the
date of shipment against any failure when installed in compliance with manufacturer’s written
instructions, UL Listing requirements, and any applicable national, state or local electrical
codes.
B.
Direct factory trained certified employees must be available for 48 hour assessment. A 24 hour
800 number must be available to support the warranty.
PART 2 - PRODUCTS
2.1
ACCEPTABLE MANUFACTURERS
A.
Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1.
2.
3.
2.2
Liebert Corporation; a division of Emerson Network Power
Current Technology Inc.; Danaher Power Solutions.
LEA International
SURGE SUPPRESSION DEVICES
A.
System Description: TVSS devices shall be constructed using multiple surge current diversion
arrays. Each array shall be constructed of individually fused metal oxide varistors (MOV)
computer matched and tested for manufacturing defects. The arrays shall be designed and
constructed to ensure MOV surge current sharing.
B.
Electrical requirements: Voltage, configuration, and grounding as required by point of
application shown on the drawings.
C.
Life Cycle Testing: TVSS devices shall be life cycle tested to withstand 10 kA (8x20
microsecond), 20 kV (1.2x50 microsecond) IEEE C62.41 Category C surge without failing or
degrading of the UL 1449 surge suppression ratings by more than 5 percent. The minimum
number of surges the devices shall be capable of surviving are specified elsewhere in the
section.
D.
Fuses: All suppression components shall be individually fused. Failure of a single component or
the operation of a single fuse element shall not render the entire mode, or product, deficient by
more than 5%. The fuses shall allow the maximum rated transient current to pass through
without operating but shall be capable of opening to clear both high and low impedance fault
conditions. The fusing shall be capable of interrupting up to 200 kA symmetrical amperes of
fault current with 600 volts AC applied to the TVSS device. The fuse protection shall be
monitored to provide indication of suppression failure. Replaceable fusing on the input feeders
or the use of single fuses to protect two or more suppression paths is not acceptable.
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E.
Noise Attenuation: Each TVSS device shall be UL 1283 listed as an electromagnetic
interference (EMI) filter. Each device shall provide up to 120 dB insertion loss from 100 kHz to
100 MHz when used in a coordinated facility system.
F.
Protection Modes: TVSS devices shall provide protection for the modes indicated based on the
electrical distribution system configuration at the point of application.
1.
2.
3.
4.
5.
Wye Connected 3-Phase 4-Wire Circuits: Line-to-line, line-to-neutral, line-to-ground,
and neutral-to-ground.
Delta Connected 3-Phase 3-Wire Circuits: Line-to-line and line-to-ground.
Single Phase 3-wire Circuits: Line-to-line, line-to-neutral, and neutral-to-ground.
Delta Connected 3-Phase, 4-wire Circuits with a High or Wild Leg: Line-to-neutral, lineto-ground, and neutral-to-ground.
Single Phase 2-wire Circuits: Line-to-neutral and neutral-to-ground.
G.
Component Testing and Monitoring: In compliance with NEAM LS-1, the TVSS devices shall
be single pulsed surge current tested in all modes at rated surge currents by an industry
recognized independent testing laboratory. The test shall include a UL 1449 surge impulse 6 kV
(1.2x50 microsecond), 500 ampere (8x20 microsecond) waveform to benchmark the unit’s
suppression voltage. The applied impulse shall be followed by a single pulse surge of the
maximum rated surge current magnitude followed by a second UL 1449 impulse as a means of
measuring clamping deviation (component degradation). Compliance is achieved if two
measured suppression voltages do not vary by more than 5 percent.
H.
Enclosures: Enclosures shall be heavy duty with no ventilation openings. The cover shall be
hinged and require a tool for access to internal components. All monitoring must be visible
without opening the cover. The disconnect handle shall be operable from the outside of the
enclosure with the cover closed.
1.
2.3
Indoor Enclosures: NEMA 250 Type 1 .
SWITCHBOARD AND SWITCHGEAR DEVICES
A.
Type of Construction: Modular design with MOV arrays grouped into field replaceable
modules. A sufficient number of modules shall be provided to provide redundancy and meet the
required surge current capacity specified.
B.
Module Connections: All surge current diversion modules shall be interconnected by lowimpedance copper plates. Modules shall be bolted to the plates to provide reliable lowimpedance connections. The system shall be designed for field servicing by a qualified
electrician. All connections, conductors, and terminals must be appropriately sized for the
specified surge current capacity. Devices requiring factory service are not acceptable. Devices
utilizing “plug-in” type modules are not acceptable.
C.
Life Cycle Testing: The minimum number of surges the devices shall be capable of surviving
are 12,000 surges per mode when tested as described in this section.
D.
Noise Attenuation: TVSS devices used for these applications shall provide noise attenuation of
41dB at 100kHz, 31 dB at 1MHz, 35 dB at 10 MHz, 53 dB at 100 MHz , per 50 Ohm Insertion
Loss Methodology from MIL 220A.
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E.
Disconnect Switch: An integral non-fused disconnect switch with an external operator shall be
provided that will disconnect all incoming phase conductors from the supplying power to the
surge current modules.
F.
Standard Features:
1.
2.
3.
4.
5.
6.
7.
G.
Unit Testing: A built-in monitoring circuit shall continually verify the protection status
during operation and display the information on a front cover status panel. A built-in test
circuit shall verify the integrity of all fuse links and each associated MOV by cyclically
sending test signals to all phase and neutral-to-ground modules. The integrity of all fuses
must be indicated on the status panel. All testing must be performed without
disconnecting power to the TVSS device.
Unit Status Indicators: Red and Green LED for each phase and neutral-to-ground (where
applicable) mounted within the enclosure but externally visible.
Remote Monitoring: Electrically isolated Form “C” dry contacts rated at 5 A and 250
Volts AC, one normally open and one normally closed, for remote monitoring of
protection status. Contacts shall reverse on failure of any surge diversion module or on
opening of any current-limiting device. Coordinate with building power monitoring and
control system.
Undervoltage Protection: Device shall be equipped with 70 percent undervoltage
detection.
Phase Loss Monitoring: Device shall be equipped with phase loss monitoring.
Power Loss Monitoring: Device shall be equipped with power loss monitoring.
Audible Alarm: Device shall be equipped with an audible alarm that is activated by a
fault condition. An alarm ON/OFF switch shall be provided to silence the alarm. A pushto-test button shall be provided to test the alarm function. A visible LED will confirm
whether the alarm has been disabled. The switch and pushbutton shall be located on the
hinged front cover of the device.
Optional Features:
1.
Transient Counter: Single or dual adjustable transient counters shall be provided to tally
the number of transient voltage surge and swell events. The readout shall be at least a
seven-digit LCD located on the cover of the device. The counter reset switches may be
inhibited and may either be remotely located or be located inside the unit and only
accessible with the cover open. The counter shall be equipped with lithium batteries
having a 10-year nominal life to maintain accurate counts in the event of a power failure.
H.
Peak Single-Impulse Surge Current Rating: [320 kA per mode/640 kA] [240 kA per
mode/480 kA] [160 kA per mode/320 kA] per phase.
I.
Protection modes and UL 1449 SVR for 480Y/277 V 208Y/120 V , 3-phase, 4-wire circuits
shall be as follows:
1.
2.
3.
Line to Neutral: 800 V for 480Y/277 V and 400 V for 208Y/120 V .
Line to Ground: 800 V for 480Y/277 V and 400 V for 208Y/120 V .
Neutral to Ground: 800 V for 480Y/277 V and 400 V for 208Y/120 V .
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PANELBOARD DEVICES
A.
Type of Construction: Non-Modular design using surge current diversion arrays. A sufficient
number of arrays shall be provided to provide redundancy and meet the required surge current
capacity specified. The status of each array shall be continuously monitored with a green LED
illuminated if the array is in full working order. All protection modes including neutral-toground (where applicable) shall be monitored.
B.
Life Cycle Testing: The minimum number of surges the devices shall be capable of surviving
are 6,000 surges per mode when tested as described in this section.
C.
Noise Attenuation: TVSS devices used for these applications shall provide noise attenuation of
30dB at 100kHz, 60dB at 500kHz, 40dB at 1MHz, 12dB at 10MHz, per 50 Ohm Insertion Loss
Methodology from MIL 220A.
D.
Standard Features:
1.
2.
3.
4.
5.
Unit Status Indicators: The device shall have an integral circuit that monitors the
operational status of all modes of protection provided by the unit including neutral-toground (where applicable).No manual testing shall be required to determine the integrity
of the suppression and filter systems. A green LED will indicate that the unit is
functioning properly. A red LED will indicate that the unit has failed.
Summary Alarm Relay Contacts: The device shall be equipped with a summary alarm
relay having one set of electrically isolated Form “C” dry contacts rated at 1 A and 125
Volts AC, one normally open and one normally closed, for remote monitoring of unit
status. Contacts shall change state to indicate a failure of the unit. Coordinate with
building power monitoring and control system.
Undervoltage Protection: Device shall be equipped with 70 percent undervoltage
detection.
Phase Loss Monitoring: Device shall be equipped with phase loss monitoring.
Power Loss Monitoring: Device shall be equipped with power loss monitoring.
E.
Peak Single-Impulse Surge Current Rating: [120 kA per mode/240 kA] [80 kA per mode/160
kA] [65 kA per mode/130 kA]per phase.
F.
Protection modes and UL 1449 SVR for 480Y/277 V 208Y/120 V , 3-phase, 4-wire circuits
shall be as follows:
1.
2.
3.
Line to Neutral: 800 V for 480Y/277 V and 400 V for 208Y/120 V .
Line to Ground: 800 V for 480Y/277 V and 400 V for 208Y/120 V .
Neutral to Ground: 800 V for 480Y/277 V and 400 V for 208Y/120 V .
.
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PART 3 - EXECUTION
3.1
INSTALLATION
A.
The contractor shall follow the TVSS manufacturer’s recommended installation practices as
found in the installation, operation, and maintenance manual and comply with all applicable
codes.
B.
Switchboard and Switchgear Installation: Mount the TVSS device on top of the gear, preferably
directly above the intended point of connection. Connect the TVSS device directly to a tap on
the main bus located on the load side of the main overcurrent protection device. Bond the
ground lead to service entrance ground.
1.
2.
C.
Panelboard Installation: Mount the TVSS device immediately adjacent to the panelboard with
conductors between suppressor and points of attachment as short and straight as possible. No
connection shall be longer than 18-inches and conductors shall be twisted together to reduce the
input inductance. Do not bond neutral and ground.
1.
3.2
Conductors or busses between the suppressor and points of attachment shall be as short
and as straight as possible. No connection shall be longer than 10 feet.
If conductors are used, all conductors must be the same length and must be twisted
together to reduce the input inductance.
Provide multiple-pole, 100-A circuit breaker as a dedicated disconnecting means for
TVSS unless otherwise indicated.
FIELD QUALITY CONTROL
A.
Manufacturer's Field Service: Engage a factory-authorized service representative to inspect,
test, and adjust components, assemblies, and equipment installations, including connections.
1.
B.
Perform tests and inspections.
1.
C.
Verify that electrical wiring installation complies with manufacturer's written installation
requirements.
Manufacturer's Field Service: Engage a factory-authorized service representative to
inspect components, assemblies, and equipment installations, including connections, and
to assist in testing.
Tests and Inspections:
1.
2.
3.
Perform each visual and mechanical inspection and electrical test stated in NETA ATS,
"Surge Arresters, Low-Voltage Surge Protection Devices" Section. Certify compliance
with test parameters.
After installing TVSS devices but before electrical circuitry has been energized, test for
compliance with requirements.
Complete startup checks according to manufacturer's written instructions.
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D.
TVSS device will be considered defective if it does not pass tests and inspections.
E.
Prepare test and inspection reports.
3.3
STARTUP SERVICE
A.
Do not energize or connect protected equipment
are installed, connected, and tested.
B.
Do not perform insulation resistance tests of the distribution wiring equipment with the TVSS
installed. Disconnect before conducting insulation resistance tests, and reconnect immediately
after the testing is over.
3.4
to their sources of power until TVSS devices
DEMONSTRATION
A.
Engage a factory-authorized service representative to train Owner’s maintenance personnel to
maintain TVSS devices. The training program shall be not less than 4 hours in duration and the
class size shall be limited to 4 persons. Training date shall be coordinated with the facility
owner.
END OF SECTION 264313
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