SECTION 26 43 13
TRANSIENT VOLTAGE SUPPRESSION FOR
LOW-VOLTAGE ELECTRICAL POWER CIRCUITS
PART 1 - GENERAL
1.01
SUMMARY
A.
1.02
RELATED DOCUMENTS
A.
1.03
Section Includes: This specification includes requirements for a high energy
transient voltage surge suppression and electronic filtering system (TVSS) used to
protect AC electrical distribution from the effects of lightning, utility switching
events, and voltage impulses generated internally within a facility.
Drawings and general provisions of the Contract, including General and
Supplementary Conditions and Division 1 Specifications, apply to this Section.
REFERENCES
A.
All TVSS devices will be designed, tested, manufactured, listed, and installed in
accordance with the applicable publications, resources, and standards shown
below:
1.
2.
3.
4.
B.
1.04
ANSI/IEEE C84.1-1989, American National Standard for Electric Power
Systems and Equipment - Voltage Ratings (60 Hertz)
ANSI/IEEE C62.41-1991(Reaffirmed 1995), IEEE Guide for Surge Voltages in
Low-Voltage AC Power Circuits
ANSI/IEEE C62.45-1997 , IEEE Guide on Surge Suppressor Testing
Underwriters Laboratories UL 1449 Standard for Safety - Transient Voltage
Surge Suppressors, Second Edition August 17 1998
Electrical work shall meet the requirements of national, state, and local codes that
govern the project. It shall be the Contractor's responsibility to be aware of and
abide by the governing codes.
SYSTEM DESCRIPTION
A.
Design Requirements, Performance Requirements:
1.
2.
System shall be tested to meet ANSI/IEEE C62.41,2002, and tested per
ANSI/IEEE C62.45 2002 . The system shall be UL 1449 listed as a complete
system under the UL 1449 Second Edition standard for Transient Voltage
Surge Suppressors. Systems not UL 1449 2nd Edition listed are not
acceptable.
The surge suppression, bonding, and grounding required in this specification
for the protection of electrical and electronic systems shall effectively protect
the systems to which it is applied against transient surges caused by lightning
and other causes throughout the useful life of the system. The connection of
the required protective devices, bonds, and grounds shall neither impair nor
26 43 13 - 1
TRANSIENT VOLTAGE SUPPRESSION FOR
LOW-VOLTAGE ELECTRICAL POWER CIRCUITS
USAF Academy
Project No. XQPZ 10-0105C
interrupt the normal operation of any electrical or electronic system.
1.05
SUBMITTALS
A.
Product Data: Provide complete product data detailing compliance, or exception in
a paragraph by paragraph listing, to all provisions of this specification. In addition,
provide the following:
1.
2.
3.
4.
B.
1.06
UL Standard 1283 Listing and supporting documentation on all applicable
devices.
UL Standard 1449 (Second Edition) listing. Indicate the type of internal or
external fusing that is incorporated in the TVSS system and what impact the
fusing has on the performance of the device with respect to surge capacity
and clamping levels.
Provide the UL card for each proposed TVSS model in the submittal
package.
Equipment supplier shall complete the TVSS submittal compliance form at
the end of this specification and include with his submittal.
Shop Drawings: Provide electrical and mechanical drawings that include detail on
unit dimensions, weights, wire size, field connections and mounting provisions.
Installation instructions shall clearly state whether the system requires an external
overcurrent device to maintain the system’s UL 1449 listing.
QUALITY ASSURANCE
A.
Qualifications:
1.
2.
B.
Regulatory Requirements:
1.
2.
3.
C.
Each complete suppression unit shall be supplied by a manufacturer whose
Quality System has been certified as compliant with ISO 9001:2000 or has a
UL-Certified Test Laboratory.
Manufacturers shall provide proof that they have been regularly engaged in
the design, manufacturing and testing of TVSS equipment for not less than
10 years.
Each complete suppression unit shall be Underwriters Laboratories (UL)
1449 Second Edition listed.
Units shall bear the suppressed voltage rating issued by UL for all protected
modes.
The TVSS shall be marked with a short circuit current rating and shall not be
installed at a point on the system where the available fault current is in
excess of that short circuit current rating. If the short circuit rating of the
device is less than the available fault current, then surge suppression-type
fuses with fuseholder/disconnect must be included with the submittal. The
surge suppression fuses shall have a 200,000 amp interrupting rating, and a
surge rating appropriate for the TVSS device.
Manufacturer's Representative Support: The Manufacturer’s representative shall
be located within a two-hour driving distance of the job site for field support.
26 43 13 - 2
TRANSIENT VOLTAGE SUPPRESSION FOR
LOW-VOLTAGE ELECTRICAL POWER CIRCUITS
USAF Academy
Project No. XQPZ 10-0105C
1.07
WARRANTY
A.
1.08
Manufacturer's Warranty: Manufacturer shall provide a product warranty for a
period of not less than 5 years. The warranty shall cover unlimited replacement,
including travel and jobsite labor of equipment or components for any reason
(lightning strike, utility fault, manufacturing defects, etc.). Special warranties in
excess of the unit’s standard warranty for purpose of this bid are not acceptable.
SYSTEM STARTUP
A.
The suppressor manufacturer or manufacturer’s representative shall perform
experienced, qualified power quality application and field supervision engineering
services, on an as-needed (reimbursable) basis.
B.
The manufacturer’s representative shall provide startup, testing, and training as
required by the Electrical Contractor and the contract specifications.
PART 2 - PRODUCTS
2.01
APPROVED MANUFACTURERS
A.
The following manufacturers are approved for this project (NO EXCEPTIONS):
1.
2.
3.
4.
2.02
Joslyn Total Protection Solutions
Current Technology
LEA International
Liebert Corporation
MANUFACTURED UNITS
A.
Equipment design shall provide a multi-stage parallel protector with voltage ratings
as specified below. The equipment surge current rating minimum surge current,
clamping voltage, and maximum continuous operating, shall be based on an 8 x 20
microsecond waveform per ANSI/IEEE C62.41 Category C3.
B.
The system’s protection design shall contain balanced metal oxide varistor (MOV)
array circuits. There may also be Silicon Avalanche Diode arrays which function
in coordination with the MOV arrays. Each protection array shall be capable of
withstanding over 1,000 sequential 10,000-amp ANSI/IEEE C62.41 Category C3
impulses without degradation or failure. Each system must have indicator lights to
report the status of each surge suppression mode (L-N, L-G, N-G, etc.). Indication
of AC line status only is not acceptable. The failure of a single MOV shall result in
annunciation via an indicating light. Systems that require external testing
equipment or tests to insure proper surge protection operation are expressly
excluded.
26 43 13 - 3
TRANSIENT VOLTAGE SUPPRESSION FOR
LOW-VOLTAGE ELECTRICAL POWER CIRCUITS
USAF Academy
Project No. XQPZ 10-0105C
2.03
C.
The specified unit shall be fused per UL 1449 Second Edition with fuses capable of
allowing the suppressor’s maximum rated transient current to pass through
suppressor without fuse operation. Fuses, whether internal or external, must be
UL Listed. If any external current limiting devices are required, those devices shall
be detailed and included in the submittal/proposal. If any external device is to be
included, its impact on surge current capability and clamping level shall be
provided. All overcurrent protection circuits shall be monitored and provide
indication of suppression operability or failure.
D.
Protection modes: The TVSS shall provide bi-directional, positive, and negative
impulse protection for Line to Neutral (L-N)(WYE); Line to Ground (L-G)(WYE or
Delta); Neutral to Ground (N-G)(WYE); and Line to Line (L-L)(Delta) surges, or as
specified. Protection modes are identified in the tables below.
E.
Operating conditions shall be 30 to 130°F, 10 to 85% humidity, non-condensing,
sea level to 6,000-foot elevation.
EQUIPMENT
A.
Suppressors for Branch Circuit Panelboards and Subpanels:
1.
Suppressors for application at panelboard or subpanelboard locations shall
have the following minimum surge current ratings per mode (8 x 20 µs
Waveform, Single Impulse):
100 – 225-amp Panelboards or Subpanelboards: 80,000 amps/mode
2.
Suppressors for application at panelboard or subpanelboard locations shall
have peak clamping or let-through voltages as follows: Testing shall be done
in accordance with ANSI/IEEE C62.41-1991, on the complete suppression
unit with lead length comparable to that needed to connect the TVSS to the
equipment to be protected. Lead length is defined as the length between the
TVSS device enclosure exterior to the connection point. The lead length
parameter must be specified on test documentation and shall not be less than
6 inches.
Nominal System Voltage
UL 1449 Suppressed Voltage Rating,
6 kV, 500-amp Bi-Wave Angle per
CBEMA (ITIC)
120/240V RMS, Single-Phase
L-N: 400 – 600 (Dynamic)
L-L: 800 (Dynamic)
L-G: 400 - 600 (Dynamic)
N-G: 400 - 600 (Static)
120/208V RMS, Three-Phase
L-N: 400 - 600 (Dynamic)
L-L: 800 (Dynamic)
L-G: 400 - 600 (Dynamic)
N-G: 400 - 600 (Static)
26 43 13 - 4
TRANSIENT VOLTAGE SUPPRESSION FOR
LOW-VOLTAGE ELECTRICAL POWER CIRCUITS
USAF Academy
Project No. XQPZ 10-0105C
277/480V RMS, Three-Phase
3.
L-N: 800 –1,200 (Dynamic)
L-L: 1,500 (Dynamic)
L-G: 800 – 1,200 (Dynamic)
N-G: 800 – 1,200 (Static)
Suppressors for application at panelboard or subpanelboard locations shall
have be rated for the following maximum continuous operating voltages
(MCOV):
Nominal System Voltage
120/240V RMS, Single-Phase
MCOV
L-N, L-G, N-G: 230
L-L: 300
120/208V RMS, Three-Phase
L-N, L-G, N-G: 230
L-L: 300
277/480V RMS, Three-Phase
L-N, L-G, N-G: 530
L-L: 550
PART 3 - EXECUTION
3.01
3.02
EXAMINATION
A.
Site Verification of Conditions: The manufacturer’s representative shall examine
the areas and conditions under which the transient voltage surge suppressors are
to be installed and advise the Electrical Contractor in writing of conditions
detrimental to the completion of work. Furnish installation instructions for use by
the Electrical Contractor.
B.
The Electrical Contractor shall verify the proper application of the TVSS (i.e.,
voltage, phases, etc.) and coordinate with upstream and downstream transient
suppression. The Electrical Contractor shall assure that all neutral conductors are
bonded to the system ground at the service entrance or the serving isolation
transformer prior to installation of the associated TVSS.
INSTALLATION/APPLICATION
A.
Special techniques: The Electrical Contractor shall install the transient voltage
surge suppressors as indicated in the manufacturer’s installation instructions, in
accordance with the applicable portions of NEC, and in accordance with
recognized industry practices to ensure that the product complies with
requirements. NEC, State, and local codes will prevail.
B.
Suppressors shall be installed without unnecessary bends and as close as
practical to the equipment, switchboard, or panelboard being protected in such a
way as to minimize connecting lead length. Suppressor leads shall not extend
beyond either the manufacturer's recommended length or three feet, whichever is
less, without approval.
26 43 13 - 5
TRANSIENT VOLTAGE SUPPRESSION FOR
LOW-VOLTAGE ELECTRICAL POWER CIRCUITS
USAF Academy
Project No. XQPZ 10-0105C
3.03
3.04
C.
Panelboard- or switchboard-mounted suppressors shall be connected to the
service by means of a suitably rated circuit breaker or fused disconnect switch. All
interconnection wiring to source protected panel shall be #6 AWG or larger for
smaller panels, and #2 AWG or larger for service entrance equipment. No smaller
wiring shall be used or permitted for connection. Terminals shall be provided for all
necessary power and ground connections.
D.
Interface with Other Work: Coordinate with other electrical work as necessary to
interface installation of the transient voltage surge suppression systems with other
work on the site. This includes verification of ground conductor termination
capabilities, coordination of TVSS supply breaker/fuse, and verification of TVSS
location and space requirements on the switchboard, panelboard, etc.
FIELD QUALITY CONTROL
A.
Site Tests, Inspection: The manufacturer’s representative shall inspect each TVSS
installation and provide the Contracting Officer’s Technical Representative with a
letter stating equipment and installation meets intent of Contract Documents, and
manufacturer's warranties and guarantees are in effect.
B.
Manufacturers' Field Services:
The manufacturer’s representative shall be
available for consultation to provide all necessary instructions for proper installation
of the equipment.
TRAINING
A.
The manufacturer’s representative shall provide up to two hours training of the
theory, operation, maintenance, and troubleshooting of the TVSS system.
END OF SECTION 26 43 13
26 43 13 - 6
TRANSIENT VOLTAGE SUPPRESSION FOR
LOW-VOLTAGE ELECTRICAL POWER CIRCUITS
USAF Academy
Project No. XQPZ 10-0105C
Attachment 1 - TVSS Submittal Compliance Form
Performance/Feature
Specification Requirement
Proposed
_______ L-N
_______ L-N
_______ L-G
_______ L-G
_______ N-G
_______ N-G
_______ L-N
_______ L-N
_______ L-L
_______ L-L
_______ L-G
_______ L-G
_______ N-G
_______ N-G
Individually Fused Components
Provided? ___ No ___ Yes
Provided? ___ No ___ Yes
External Fuses (if required)
Provided? ___ No ___ Yes
Provided? ___ No ___ Yes
50 KHz ____ dB
50 KHz ____ dB
100 KHz ____ dB
100 KHz ____ dB
Single Impuse Surge Current
Rating Per Mode (8 x 20 µs)
UL 1449 Suppressed Voltage
Rating for 6 kV, 500A Bi-wave
Warranty For Damage To TVSS
Due To Lightning
Dispatch Location For Local
Support And Start-Up
MCOV For All Components
Protection Modes Provided
Category C3 Repetitive Surge
Current Capacity
High Frequency Noise Filtering
Attenuation (where required)
Low Impedance Internal
Disconnect
1 MHZ ____ dB
1 MHZ ____ dB
10 MHZ ____ dB
10 MHZ ____ dB
100 MHZ ____ dB
100 MHZ ____ dB
Required? ___ No ___ Yes
Provided? ___ No ___ Yes
26 43 13 - 7
TRANSIENT VOLTAGE SUPPRESSION FOR
LOW-VOLTAGE ELECTRICAL POWER CIRCUITS
USAF Academy
Project No. XQPZ 10-0105C