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SECTION 16709 - TRANSIENT VOLTAGE SURGE SUPPRESSORS
PART 1 - GENERAL
1.01
1.02
DESCRIPTION
A.
Surge Suppressors for AC Power Systems
B.
Surge Suppressors Communication Circuits
RELATED WORK
A.
1.03
Section 16110: Raceways and Conduits
APPLICABLE PUBLICATIONS
A.
General: The latest edition of the following standards and publications shall
apply to the work of this section;
1. ANSI/IEEE C62.33 IEEE Standard Test Specifications for Varistor Surge
Protective Devices.
2. ANSI/IEEE C62.35 IEEE Standard Test Specification for Avalanche
Junction Semiconductor Surge Protective Devices.
3. ANSI/IEEE C62.36 IEEE Standard Test Methods for Surge Protectors
Used in Low-Voltage AC Power Circuits.
4. ANSI/IEEE C62.41 IEEE Guide on Surge Testing for Equipment
Connected to Low-Voltage AC Power Circuits.
5. ANSI/IEEE C62.45 Guide on Surge Testing for Equipment Connected to
Low Voltage AC Power Circuits.
6. IEEE Standard 142 - Recommended Practice for Grounding
7. IEEE Standard 518 Recommended Guide on Electrical Noise
8. UL-1283 Standard for Safety - Electromagnetic Interference Filters
9. UL-1449, 2nd Edition Standard for Safety - Transient Voltage Surge
Suppressors
10. NFPA 70 National Electrical Code
11. NFPA 75 Standard for Protection of Electronic Computer Systems
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-1
12. NFPA 780 Standard for the Installation of Lightning Protection
Systems
13. Military Standard (MIL Std.) 220A
14. Federal Information Processing Standards (FIPS) Publication 94
a.
CCITT Rec. K-17 Waveform specification for electronic systems
15. NEMA LS-1 Low Voltage Surge Protective Devices
1.04
SYSTEM DESCRIPTION
A.
B.
1.05
General: Transient voltage surge suppressor (TVSS) or Surge Protective
Device (SPD) is the equipment required for the protection, within specified
and tested limits, of AC electrical circuits and electronic equipment from the
effects of lightning induced voltages, external switching transients and
internally generated switching transients. Individual suppressors shall be
provided where shown on the drawings.
Definitions (Clauses)
SUBMITTALS
A.
Submit in accordance with Section 16010, Basic Electrical Requirements.
B.
Submit installation details for all suppressors demonstrating mechanical and
electrical connections to equipment being protected.
C.
Submit specific test data for the actual method of installation proposed.
Submittals will not be reviewed unless they include proper project related
data. Interpretation of standard manufacturers published data will not be
acceptable unless the data coincides with the actual installation procedure.
D.
Submittals shall include, but shall not be limited to, the following data;
1. Complete data for each suppressor type indicating conductor sizes,
conductor types, connection configuration, lead lengths and all
appropriate dimensions.
2. Dimensions for each suppressor type indicating mounting dimensions
and required accessory hardware.
3. Certified test data from a nationally recognized independent testing
laboratory indicating the ability of the product to meet or exceed all
requirements of this specification. Tested units shall survive all testing
and be fully functional without damage.
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-2
4. If requested, a sample, which will be returned, of each suppressor type
to be used shall be submitted.
5. Drawings shall be provided indicating suppressor mounting arrangement
and lead length configuration, and mounting arrangement of remote
diagnostic equipment and assemblies.
6. List and detail all protection systems such as fuses, disconnecting
means and protective materials.
7. Documentation of type of suppression Components utilized within the
TVSS to perform the rated and tested purpose. Documentation provided
to UL for listing purposes is acceptable. Confidentiality agreements will
be signed as required for access to this documentation.
8. Listing to UL 1449, 2nd Edition and include UL 1449 2nd Edition
listing/classification page verifying UL clamping voltage stated on
catalog data.
9. Conformance to appropriate referenced standards and publications
listed in paragraph 1.03A.
1.06
10.
The submittal shall include a listed comparison and proof of compliance with
each paragraph of these specifications.
E.
Submitted components shall comply through verified testing to the minimum
and maximum values listed and shall be equal to or better than the
characteristics specified herein.
F.
Electrical performance data shall be provided on form A included at the end of
this section.
SUBMITTALS FOR INFORMATION
A.
1.07
Submit in accordance with Section 16010, Basic Electrical Requirements.
PROJECT CLOSEOUT SUBMITTALS
A.
Record actual locations of suppressors, grounding terminations, bonding
connections, and routing of system conductors in project record documents.
B.
Installation Certification: After installation, the manufacturer shall furnish a
letter indicating that the installation was inspected by a factory authorized
representative, the date of inspection, date equipment was put into service,
and that it meets all of the manufacturer's wiring and installation
requirements. Submit three copies to the Engineer for review.
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-3
1.08
1.09
1.10
QUALITY ASSURANCE
A.
Surge suppression, grounding and bonding shall effectively protect within
tested limits, the systems to which applied against lightning transients,
internal and external switching transients, and other surge transients
throughout the useful life of the system. Surge Protective devices (SPD) and
related grounding and bonding systems shall be designed and installed in
such a manner that normal operation, performance ratings, and listing of the
system is not impaired by the installation of such devices, wiring or
connections.
B.
Any SPD which shows evidence of failure or incorrect operation during the
ten year warranty period shall be repaired or replaced at no expense to
Owner including labor and materials. Since "Acts of Nature" or similar
statements include the lightning threat to which these suppression devices
shall be exposed, any such general clause limiting warranty responsibility in
the general conditions of this specification shall not apply to this section. The
warranty shall cover the entire device not just the modules.
C.
Installation of SPD in or on electrical or electronic distribution systems and
equipment shall in no way compromise or violate equipment listing, function,
labeling, or warranty of the distribution equipment.
D.
All surge protective devices (SPD) and supporting components shall be
guaranteed by the installing contractor to be free of defects in materials and
workmanship for a period of ten years from the date of substantial completion
for the system to which the SPD is attached. Suppressors or components
damaged prior to substantial completion shall be replaced at no cost to the
Owner.
QUALIFICATIONS
A.
Manufacturer: Company specializing in surge suppression equipment of the
type herein specified with minimum ten years documented experience.
B.
Installer: Installation shall be by the manufacturer or a duly licensed electrical
contractor.
FIELD MEASUREMENTS
A.
1.11
Verify that field measurements are as indicated on shop drawings.
COORDINATION
A.
Coordinate work with electrical installations.
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-4
PART 2 - PRODUCTS
2.01
MANUFACTURERS
A.
The intent of this specification is to allow manufacturers with similar
equipment utilizing silicon avalanche diode or metal oxide varistor (MOV)
technology to provide transient voltage surge suppression which will
adequately protect equipment within the guidelines set forth herein.
B.
The surge protective devices manufacturer shall offer factory repair service
and replacement for all units. The manufacturer shall provide this service
within four working days, and provide replacement components shipped to
the Owner for installation within the allocated response time.
C.
Single Sources of Supply: All AC power suppressors (SPD) shall be
manufactured by a single manufacturer - Transtector, PowerLogics,
Advanced Protection Technology (APT), Raychem Rayvoss, Leviton, Cutler
Hammer, Northern Technologies, Inc. All electronic system suppressors shall
be manufactured by a single manufacturer, Transtector, Northern
Technologies, EDCO, Phoenix, Polyphaser or Atlantic Scientific.
Manufacturers listed herein have demonstrated that they can provide
equipment that meets or exceeds all specification requirements, however
other manufacturers will also be considered. Specific demonstration of
meeting all specification requirements is required for any submitted
equipment whether listed herein or not.
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-5
2.02
COMPONENTS
A.
Main Service and Distribution Equipment Suppressors (SPD): The A.C.
Voltage Surge Protective Devices shall be a high speed, high current solidstate device designed to protect electronic equipment and electrical systems
from transient over voltages. It shall limit the magnitude of a transient
overvoltage present on the A.C. service or distribution power lines. The
suppressor shall provide continuous bi-polar, bi-directional, non-interrupting
protection and be capable of instant automatic reset with no degradation in
protection capabilities. Gas tubes are not acceptable. The suppressor shall
be solid state, utilizing silicon junction avalanche diodes or MOV's. It shall
start to suppress the transient at a minimum of 115% of the peak voltage of
the sine wave. This is the Minimum Voltage Protection Level (MVPL). At
maximum surge current dissipation, the device shall not exceed the maximum
voltage protection level (MXVPL). The suppressor assembly shall be installed
in parallel with the service main disconnect, distribution or branch panel main
lugs as shown. Connect suppressor to over current protection sized as
shown with an AIC rating equal to panel rating. The suppressor shall be
contained in an enclosure appropriate for the environmental application in
accordance with paragraph 2.02C. In addition, it shall have status indicator
lights, dry contacts with remote alarm capabilities and an audible alarm.
Suppressors shall be assembled as modular units to permit quick, easy
replacement of failed components. Provide one spare “module” of each type
suppressor for Owner’s use. If entire suppressor is one module, provide one
complete spare.
1. Electrical Service
Voltage
Frequency
Phases
Wiring configuration
e. IEEE 62.41-1991
(Table 4) catagories
unless otherwise
indicated on the
drawings:
Service Entrance Sizes
< 600A
> 600 A to 1.2 kA
> 1.2 kA
Distribution or
Sub –panels
f. IEEE 62.41-1991
(Table 8) 10/1000 waveform
requirements. Use
“High Exposure”
level for all suppressor
a.
b.
c.
d.
480/277 VAC
50/60 Hz
3 phase
4 wire, Wye
120/208 VAC
50/60 Hz
3 phase
4 wire, Wye
B3/C1
C2
C3
B3/C1
C2
C3
B2
B2
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-6
locations.
2.
1 kV & 4 kA
0.5 kV & 2 kA
Electrical Performance
a. Min. Voltage Protection Level 470 volts
(MVPL)(L-N) (10x1000 µsec peak
waveform)
200 volts
peak
b. Max. Voltage Protection Level 700 volts
300 volts
peak
(MXVPL)(L-N)(10x1000 µsec peak
waveform)
c. Max. Voltage Protection
Level per
IEEE 6241-1991
(6 & 10kV 1.2/50µs,
3 & 5 Ka 8/20µs)
800 volts
peak
400 volts
peak
(20KV 1.2/50µs; 10KA 8/20µs) 900 volts
peak
500 volts
peak
UL 1449 2nd Edition SVR’s
700 volts
(6 kv, 1.2/50µs;0.5 ka 8/20µs) peak
330 volts
peak
d. Max. Continuous Operating
Voltage (MCOV) of nominal
line
115%
minimum
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-7
115%
minimum
e. Max. Surge Current Dissipation
See 2.02.A.1.e & f
See 2.02.A.1.e & f
per Phase per Polarity (the voltage
protection levels per paragraphs
2.02.A.2.b & c shall not be
exceeded during this performance test.)
f.
Response Time
≤5 ns
≤5 ns
g. Min. Service Life
The suppressor shall be provided
with a 10 year unconditional
warranty or shall meet the
following surge tests
without being damaged or
changing the voltage protection
level (clamping voltage) by 10%
of initial value provided.
Maximum 50-60 seconds between
pulses.
(1) Shortwave Test –
surge current
1000 surges
(6kV, 1.2/50µs; 3kA, 8/20µs)
(2) Longwave - surge current 5000 surges
(10 x 1000 µs)
(1kv & 4 kA @ 277V
0.5 kV & 2 kA @ 120V)
1000 surges
5000 surges
h. Temperatures –
(1) Operating
(2) Storage
0oC to +50oC.
-20oC to +65oC.
i.
Electrical Safety
UL 1449
2nd Edition Lst.
j.
Suppression system shall be normal
mode (L-N) only (for 480/277VAC
& 208/120 VAC services).
0oC to +50oC.
-20oC to +65oC.
UL 1449
2nd Edition Lst.
k. Power On Indicators and Failure Detection (for 480/277VAC & 208/120
VAC): A lighted panel on the cover shall provide indication that the
suppressor is properly activated and shall also indicate mode failure. If the
suppressor fails, an isolated 2 amp 120 VAC contact shall close. In
addition, an audible alarm shall be provided with manual reset.
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-8
l.
Failure mode – SPD’s shall be designed to fail shorted. Any fuses in series
with the SPD’s shall not open during a surge event.
B.
Disconnect: Main service suppressors shall be provided with an integral
fused disconnect switch or external branch circuit breaker as shown or
required by UL. Breakers and suppressors shall have an AIC fault withstand
rating equal or greater than the AIC rating of the equipment to which it is
connected. The length of wiring from the tap at the service conductors to the
suppressor being protected, however, shall not exceed the maximum length
permitted by manufacturer, to maintain the maximum voltage protection level.
Suppressors may be installed within switchgear or panelboards where UL
label or listing is not affected, suppressors are completely and easily
accessible, indicator lights are visible and audible alarm can be easily heard.
C.
Enclosures: Enclosures for main service suppressors shall be as follows;
1.
Minimum 14 gauge painted steel or suitable enclosure to meet the
NEMA selected requirements as listed with fully hinged door and
lockable latch.
a.
b.
c.
d.
D.
NEMA 1 (General Purpose).
NEMA 4 Watertight, and dust-tight.
NEMA 4X Watertight, dust-tight and corrosion resistant.
NEMA 12 Dust-tight and drip-tight (where specified on drawings).
Operation Status Indicator Audible remote signaling and Visual Systems:
Service entrance equipment
1.
Install in front enclosure of equipment
a.
Visual System
Equipment with LED indicator lights per phase.
1.
2.
3.
(4)
b.
Protection: Suppressor Working - Green LED's.
Warning/Fault: Suppressor Burnout - Red LED's.
LED's shall be field replaceable.
Other visual indicators where approved.
Remote Signaling
(1)
Relay with Auxiliary Form C contacts: Two sets @ 2
ampere, 120 volts each. 1 Set N.O. and 1 set N.C. to
operate upon failure of suppression module, blown fuse
or tripped circuit breaker in suppressor module or in
disconnect switch for alarm connection to remote
location.
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-9
c.
E.
Audible – The audible alarm shall activate upon a fault condition
within the suppressor. An alarm silence/reset switch and push-totest switch shall be provided.
Plug-in Receptacle SPD Devices: (Receptacles Suppressor) - Unit shall
include the following features:
1.
Instant automatic reset after safely eliminating transient surges from
switching transients, induced lightning, inductive motor switching and
other forms of transient over voltages in normal mode (L-N) only.
2.
Designed for 120 VAC, 1 phase (3 wire service), plug-in applications
arranged to plug into any 15 or 20 amp, duplex, grounded receptacle.
3.
A minimum of two single or one duplex, grounded 20 amp receptacles.
4.
To be connected in parallel.
5.
Employ only solid-state, silicon avalanche junction diode suppressors
or metal oxide varistors.
6.
Response time: less than 5 nanoseconds.
7.
Suppression power: Minimum 12,000 watts or 12 joules. (10 x1000 µs
pulse), at a max.VDL of 300Vpeak.
8.
Operating temperature: -0/C to 50/C.
9.
Voltage (V peak) protection level: 220 Minimum, 300 Maximum
(10x1000 µs pulse). 330 maximum per UL 1449. 2nd Edition.
10.
Service Frequency: 50/60 Hertz.
11.
Life expectancy: 10 years plus.
12.
Indicator light to turn on when unit is non-operational. (Usually Off)
13.
Internally fused to take unit off-line if it self-sacrifices to protect against
catastrophic power failure. Equipment plugged into suppressor shall
continue to operate.
14.
Warranty: 3 year guarantee to be repaired or replaced at no cost if
damaged by normal operating use during the warranty period.
15.
U.L. 1449, 2nd Edition listed (6kV 1.2/50 µs; 500 A 8/20 µs).
16.
IEEE C62.41 Cat. A3 and B3 tests. (B3 = 6kV and 3kA)
Minimum 10 year unconditional
warranty.
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-10
F.
G.
Receptacle suppressor with one input and one output RJ-11 jacks: Unit shall
be same as in paragraph `A' above with the addition of 1-telephone protector
and 2-RJ-11 (input and output) jacks with common grounds with the AC
power. Telephone protector shall have the following characteristics and shall
provide common and normal mode protection.
1.
D-C Protective Level voltage (maximum)
T-R .....................................300-380V
T-G......................................300-380V
R-G......................................300-380V
2.
Leakage Current (max @ 60HZ).............<10µa
3.
Holding current (min.)...................260 ma
4.
Peak On-State Voltage IT = 1A............3V
5.
Response time............................<1ns
6.
Peak Pulse Current (10x1000µs)
a.
Applied between T-R, T-G, R-G…….100A
b.
Applied simultaneously T-G and R-G.......200A
7.
Capacitance..............................<100pf
120V direct connected Hard Wired suppressors shall be provided with
mounting provisions and wire leads for hardwire connection. Suppressors
shall have the same characteristics as the above specified receptacle
suppressors (E).
H.
Bonding and Grounding Conductors and Materials for Main Service
Suppressors:
1.
Size: Conductors utilized for surge suppressor connections to service
conductors shall be a minimum of #6 AWG stranded insulated copper
unless otherwise specified.
2.
Bus: Ground bus or strip material where used shall be copper, a
minimum of 1/4 inch thickness and two inches wide unless otherwise
specified. Bus materials shall be secured to surfaces with a
appropriate insulators and mechanical fasteners. Bus connections
shall be bolted and reinforced as necessary to provide a permanent
and secure connection.
3.
Connections Compliance: Connectors, splices, and other fittings used
to interconnect grounding conductors, bonding to equipment or ground
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-11
bars, shall comply with requirements of the National Electric Code and
be accepted by Underwriters' Laboratories for the purpose.
4.
Connectors: Connectors and fittings for grounding and bonding
conductors shall be of the compression type in above grade locations.
Connections below grade shall be exothermically welded.
5.
Dissimilar Materials: Bonding connections between electrically
dissimilar metals shall be made using exothermic welds or using bimetal connectors designed to prevent galvanic corrosion.
I.
Communication Lines: The following standard for separately mounted
telephone and signal line suppressors shall apply. All protectors shall be
securely mounted at protected equipment location. All suppressors shall
provide common (L-G) and normal (L-L) protection. Suppressors shall be
tested in accordance with IEEE C62.36-1994 as a minimum. Protective
interfacing with the telephone wire pairs shall be listed to UL 497A.
J.
Data Line Protection: Solid state, silicon avalanche diode circuitry for
protection from over voltages on long cable runs employing standard RS-232,
9, 15, or 25-pin "D" connectors utilized to interface a remote station with a
host CPU. Unit shall have 2 built-in or ribbon cable attached connectors (in
and out) and an external ground lug or cable. Connect ground lug or cable to
CPU or terminal grounding system with a No. 12 copper green insulated
stranded ground wire as short as possible. Select pins requiring protection
based on protected equipment wiring requirements. Protectors shall be
designed to be easily installed on multiplex panels with connector spacing at
a minimum of 1.0 inch centers.
1.
2.
3.
4.
5.
6.
Signal line voltage (max).........................15v peak
Leakage at signal voltage........................<5m amp
Voltage protection level. .........................16v peak
Response time...................................5 nanoseconds or less
Impedance per line................................40 OHM max.
Peak power dissipation..........................15,000 watts (10/1000 Test Wave
form)
7. Temperature range...............................-20oC to +65oC
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-12
8. Capacitance:
a. data rates <20,000 baud - <2,000 pf
b. data rates 20,000 baud to 2Mhz - <100 pf
c. data rates >2MHz to 100 Mhz - <40 pf
9. UL 497B listed.
K.
Signal line protection (telephone) - solid state, silicon avalanche diode
circuitry for protection from over voltages on 2 or 4 wire signal lines such as
balanced pair telephone, metallic pair telephone, buried and overhead field
cable, remote radio equipment, and control systems. Unit shall have an
external ground lug or wire. Connect ground lug or wire to protected
equipment grounding system with a No. 12 green insulated stranded ground
wire as short as possible.
1. L-L & L-G voltage (peak)
13
27
54
120
160
L-L & L-G Voltage Protection Level
16
33
67
150
200
2.
3.
4.
5.
L-L and L-G Leakage @ max L-L and L-G voltage...<5µa
Response time......................................,.<5 nanoseconds
Series impedance(each line)........................33 Ohm max.
Peak power dissipation (L-L) or (L-G)......15,000 watts (10 x 1000 Test
Form)
6. Temperature Range...............................-20oC to +65oC
7. U.L. 497B listed
Wave
L.
Modem protector for leased lines - solid state silicon avalanche diode circuitry
for non-faulting/non-interrupting protection from over voltages on leased
phone lines. Full duplex protection shall be provided for both send and
receive channels. Terminals shall be provided for 4-wire leased line input and
output to equipment plus ground. Connect ground terminal to equipment
ground.
1.
2.
3.
4.
5.
6.
7.
M.
Signal line voltage (max)...................160V peak
Leakage @ signal voltage............................5µa
Clamp point.......................................200V peak
Response time...............................<5 nanoseconds.
Series impedance..........................33 Ohm max.
Peak power dissipation...................15,000 watts
Operating Temperature................-20oC to +65oC
Modular, twisted pair protection - solid state, silicon avalanche diode circuitry
for protection from over voltages on twisted pair data or audio lines.
Protectors shall clip mount on 66 punch down blocks furnished with grounding
bar or studs and shall be totally enclosed. Units shall be securely mounted at
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-13
terminal locations where shown and shall be grounded to the main building
ground with a minimum No. 8 stranded copper green insulated ground
conductor as short as possible. Terminals shall be screw insertion lug type.
No crimp fork or ring type permitted.
1.
2.
3.
4.
5.
N.
Response time..............................<5 nanoseconds
Peak power dissipation (1ms)...............15,000 watts
Temperature range..........................-20o C to +50o C
Maximum voltage protection levels (peak) utilizing a 10 x 1000µs
waveform for normal and common mode protection shall be 240-380V
or 45V as indicated on the drawings.
Peak repetitive pulse current.
a.
1. x 2. µsec - 225 amp
b.
8 x 20µsec - 150 amp
c.
10 x 1000µsec - 100 amp
75 ohm coaxial cable protectors - Solid state, silicon avalanche diode
circuitry for non-interrupting overvoltage protection of RG- 59/U coaxial cable.
Unit shall be provided with one female input connector for "F" series male
connector, one output RG-59/U coax cable terminated with an "F" series
male cable end connector and A #16 stranded, 18 inch long grounding wire
on output end of unit or similar arrangement. Securely mount adjacent to
protection equipment and ground to equipment or local building ground if an
equipment ground is not available.
1.
Normal Operating Characteristics
a.
b.
c.
d.
2.
Voltage .........................5.8V max
Current.......................500ma max
Frequency.....................DC to 10 Mhz
Insertion Loss................3.5db @ 4Mhz
Protection Requirements
a.
b.
c.
d.
Transient suppression level.........7.5v Voltage Protection Level
Transient response............<5 nanoseconds
Operating temp................-20o C to +50o C
Energy dissipation............15,000 watts (10X1000 Test Wave)
PART 3 - EXECUTION
3.01
INSTALLATION OF MAIN SERVICE AND DISTRIBUTION EQUIPMENT SURGE
SUPPRESSORS
A.
Suppressors shall be installed at Service Entrance switchboards and
distribution equipment where shown as close as practical to equipment to be
protected consistent with the available space. Where installation space
permits and where no code restrictions apply, suppressors may be installed
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-14
within protected equipment. Suppressors installed in this manner shall utilize
the equipment ground bus or enclosure as a medium for bonding of their
ground terminals. Bonding jumpers not exceeding two inches in length shall
be installed between the ground bus or enclosure and suppressor ground
terminals. Bolted connections with star washers shall be used to insure
electrical and mechanical integrity of connections to the ground bus or
enclosure. Remove paint where connections are made to the enclosure.
Conductors from suppressors shall attach to main service bus in the service
entrance equipment on the load side of any electrical metering equipment.
3.02
B.
Suppressors shall be installed in a neat, workmanlike manner. Lead dress
shall be consistent with recommended industry practices for the system on
which these devices are installed.
C.
All system wiring shall be classified into protected and non-protected
categories. Wiring on the exposed side of suppression devices shall be
considered unprotected.
Surge suppressor grounding
and bonding
conductors shall also fall into this category.
D.
All wiring between surge suppressors and protected equipment shall be
considered protected and connected in accordance with the latest edition of
the NEC.
E.
A minimum of three inches of separation shall be provided between parallel
runs of protected and unprotected wiring in control panels, terminal cabinets,
terminal boards and other locations. In no case shall protected and
unprotected wiring be bundled together or routed through the same conduit.
Where bundles of protected and unprotected wiring cross, such crossings
shall be made at right angles.
FIELD QUALITY CONTROL
A.
Disconnect suppressor prior to megger testing of service entrance distribution
equipment and panelboards.
B.
Supply certified test reports for all tested parts, elements and/or systems or
where required by the Owner to substantiate published ratings of claims.
END OF SECTION 16709
TRANSIENT VOLTAGE SURGE SUPPRESSORS 16709-15
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