ASTM F1507-99(2022)

Standard Specification for Surge Suppressors for Shipboard Use

ABSTRACT
This specification establishes the performance requirements for surge suppressors used on shipboard ac power circuits that may consist of a single circuit element or may be a hybrid device using several suppression devices. The surge suppressor shall be a protective device for limiting voltage transients on equipment by discharging, dissipating internally, bypassing surge current, or a combination thereof, and which prevents continued flow of follow current to ground and is capable of repeating these functions. Surge suppressors shall be classified into the following classes and types: Class A—surge suppressor associated with long circuit branch; Class B—surge suppressor for short branch circuit; and Type I—permanent connected type; Type II—plug-in type; Type III—cord-connected type; and Type IV—power director (power center) type. The surge suppressors shall conform to specified performance, operating, grounding, and supplementary protection requirements. They shall also undergo designated design, and conformance production tests such as insulation withstand test, power frequency withstand test, impulse voltage-time tests (including fast-front impulse suppression tests and slow-front impulse suppression tests), voltage protection level tests, duty cycle tests, life cycle tests (including voltage and current impulses), load current and voltage drop tests (including rated current and voltage drop and inrush current), and ground continuity test.
SCOPE
1.1 This specification establishes performance requirements of surge suppressors for use on shipboard ac power circuits.  
1.2 Surge suppressor shall be a protective device for limiting voltage transients on equipment by discharging, dissipating internally, bypassing surge current, or a combination thereof and which prevents continued flow of follow current to ground and is capable of repeating these functions.  
1.3 Surge suppressors covered by this specification may consist of a single circuit element or may be a hybrid device using several suppression devices.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Sep-2022
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.10 - Electrical

Overview

ASTM F1507-99(2022), Standard Specification for Surge Suppressors for Shipboard Use sets forth the performance and design criteria for surge suppressors deployed on shipboard AC power circuits. Developed by ASTM International, this standard ensures that surge suppressors effectively protect shipboard electrical systems from voltage transients by discharging, dissipating, or bypassing surge currents. Recognized globally, this specification supports safe, reliable, and consistent functioning of electronic equipment in marine environments, addressing both individual and hybrid surge protection devices.

Key Topics

• Device Functionality: Surge suppressors covered by this standard must limit voltage transients and prevent continuous fault current flow to ground. They are required to repeatedly provide these protective functions during normal operation.
• Classification of Suppressors:
  • Class A: For long circuit branches, typically greater than 30 feet from the distribution panel.
  • Class B: For short branch circuits, installed either within 30 feet of the panel or in the panel itself.
  • Type I: Permanently connected devices (panel or hard-wired installation).
  • Type II: Plug-in devices for direct connection to receptacles.
  • Type III: Cord-connected devices, designed for flexibility and portability.
  • Type IV: Integrated “power director” units, combining suppression with circuit breaker and switching functions.
• Performance Requirements: Covered surge suppressors must meet rigorous criteria for voltage withstand, impulse testing, voltage protection levels, response times, leakage current limits, grounding provisions, and life cycle durability.
• Testing Protocols: Specifies insulation withstand, impulse voltage, duty cycle, voltage protection level, and life cycle testing-as well as requirements for production and conformance verification.
• Materials and Construction: Mandates corrosion-resistant enclosures, robust insulation, and the use of suitable plastics or metals.

Applications

Surge suppressors conforming to ASTM F1507-99(2022) are essential for:

• Shipboard Electrical Distribution: Protects sensitive navigation, communication, and control systems from damaging voltage spikes and surges.
• Marine Power Centers: Ensures the longevity and reliable operation of distributed power circuits, even in harsh marine environments.
• Plug-in and Portable Equipment: By specifying Types II and III, the standard supports use-cases where equipment needs protection without permanent installation.
• Retrofit and New Build Ships: Both new installations and modernization projects within commercial, naval, and research vessels can benefit from compliant surge suppressors.

Key benefits:

• Enhances safety of onboard personnel and equipment
• Reduces unplanned downtime and electrical failures
• Complies with international trade and maritime safety regulations

Related Standards

Surge suppressors for shipboard use should be selected with reference to the following standards, which are harmonized or referenced within ASTM F1507-99(2022):

• MIL-STD-1399 Section 300 – Military Standard for Shipboard AC Power Interface
• UL 1449 – Safety standard for Transient Voltage Surge Suppressors
• ANSI/IEEE C62.41 – Recommended Practice on Surge Voltages in Low-Voltage AC Power Circuits
• ANSI/IEEE Std 4 – High Voltage Testing Procedures
• ANSI/IEEE C62.45 – Guide on Surge Testing for Equipment Connected to Low-Voltage AC Power Circuits
• ANSI/IEEE C84.1 – Voltage Ratings for Electrical Power Systems

These related documents ensure compatibility, safety, and performance for surge suppression in demanding marine environments.

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Keywords: surge suppressor, ASTM F1507-99, shipboard AC power, voltage transient, surge protection, marine electrical, hybrid suppressor, maritime safety, power quality, IEEE C62.41, UL 1449, MIL-STD-1399

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:F1507 −99 (Reapproved 2022) An American National Standard
Standard Specification for
Surge Suppressors for Shipboard Use
This standard is issued under the fixed designation F1507; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.3 Military Standard:
MIL-STD-1399 Section 300; Military Standard Interface
1.1 This specification establishes performance requirements
Standard for Shipboard Systems, Section 300, Electric
of surge suppressors for use on shipboard ac power circuits.
Power, Alternating Current
1.2 Surge suppressor shall be a protective device for limit-
2.4 Underwriters Laboratories Standard:
ing voltage transients on equipment by discharging, dissipating
UL 1449 Transient Voltage Surge Suppressors, 2nd Edition
internally, bypassing surge current, or a combination thereof
and which prevents continued flow of follow current to ground
3. Terminology
and is capable of repeating these functions.
3.1 Definitions:
1.3 Surge suppressors covered by this specification may
consist of a single circuit element or may be a hybrid device NOTE 1—These definitions other than specific to the standard are taken
from UL 1449, ANSI/IEEE C62.41, and MIL-STD 1399 to provide for
using several suppression devices.
harmonization of terms.
1.4 This international standard was developed in accor-
3.1.1 combination wave, n—a surge delivered by an instru-
dance with internationally recognized principles on standard-
ment that has the inherent capability of applying a 1.2/50-µs
ization established in the Decision on Principles for the
voltage wave across an open circuit and delivering an 8/20-µs
Development of International Standards, Guides and Recom-
current wave into a short circuit. The exact wave that is
mendations issued by the World Trade Organization Technical
delivered is determined by the instantaneous impedance to
Barriers to Trade (TBT) Committee.
which the combination wave is applied. (Also called combi-
nation voltage/current surge or combination V/I surge.)
2. Referenced Documents
3.1.2 crest (peak) value (of a wave, surge or impulse),
2.1 The following documents of the issue in effect on the
n—the maximum value that a wave, surge, or impulse attains.
dateofmaterialpurchaseformapartofthisspecificationtothe
3.1.3 electric power source, n—the electric power that is
extent referenced herein.
supplied for testing.
2.2 American National Standards:
3.1.4 electric power system ground, n—ground is a plane or
ANSI/IEEE Std 4 IEEE Standard Techniques for High
surface used by the electric power system as a common
Voltage Testing
reference to establish zero potential. Usually, this surface is the
ANSI/IEEE C62.41 Recommended Practice on Surge Volt-
metallic hull of the ship. On a nonmetallic hull ship, a special
age in Low-Voltage AC Power Circuits
ground system is installed for this purpose.
ANSI/IEEE C62.45 Guide on Surge Testing for Equipment
3.1.5 follow (power) current, n—the current from the con-
Connected to Low-Voltage AC Power Circuits
nected power source that flows through a surge protective
ANSI/IEEE C84.1 Electrical Power Systems and
device following the passage of discharge current.
Equipment—Voltage Ratings
3.1.6 frequency tolerance, n—frequency tolerance is the
maximum permitted departure from nominal frequency during
normal operation, excluding transient and cyclic frequency
variations. This includes variations such as those caused by
load changes, switchboard frequency meter error, and drift.
Unless specified otherwise, frequency tolerance shall be con-
This specification is under the jurisdiction of ASTM Committee F25 on Ships sidered to be 610 % of nominal frequency.
and Marine Technology and is the direct responsibility of Subcommittee F25.10 on
Electrical.
Current edition approved Oct. 1, 2022. Published October 2022. Originally
approved in 1994. Last previous edition approved in 2017 as F1507 – 99 (2017). Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
DOI: 10.1520/F1507-99R22. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
2 4
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St., Available from Underwriters Laboratories (UL), 2600 N.W. Lake Rd., Camas,
4th Floor, New York, NY 10036, http://www.ansi.org. WA 98607-8542, http://www.ul.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1507−99 (2022)
3.1.7 inrush current, n—the inrush current is a sudden 3.1.20 surge protective device (SPD), n—aprotectivedevice
change in line current that occurs during startup or as a result composed of any combination of linear or non-linear circuit
of a change to the operating mode. Inrush current is dependent elements and intended for limiting surge voltages on equip-
on the type of load connected to the surge suppressor, and ment by diverting or limiting surge current; it prevents contin-
typically will rise to a maximum value in a few milliseconds ued flow of follow (power) current and is capable of repeating
and decay to rated value in several milliseconds to several these functions as specified.
seconds.
3.1.21 temporary overvoltage (TOV), n—a voltage swell
3.1.8 leakage current, n—line current drawn, either line-to-
from a sudden change in voltage which goes outside the
line or line-to-ground, by the suppressor when operated at the voltage tolerance limits but does not exceed 120 % of nominal
maximum continuous operating voltage.
system voltage and returns to and remains within these limits
within 2 s after the initiation of the disturbance.
3.1.9 maximum continuous operating voltage, n—maximum
sinusoidal rms voltage which may be continuously applied
3.1.22 transient voltage surge suppressor (TVSS), n—a
without degradation or deleterious effects. surge protective device intended for connection electrically on
3.1.10 measured limiting voltage, n—the crest (peak) value the load side of the main overcurrent protection in circuits not
of the voltage measured at the leads, terminals, receptacle exceeding 600V. (Location CategoriesAand B as described in
contacts and the like, intended for connection to the load(s) to ANSI/IEEE C62.41.)
be protected, and resulting from application of a specified
3.1.23 two-port transient voltage surge suppressor, n—a
surge.
TVSShavingonesetofelectricalconnections(terminals,leads
3.1.11 nominal frequency, n—the nominal frequency is the and the like) intended for connection to the ac power circuit
designated frequency in Hz. and one or more separate sets of electrical connections
(terminals, leads, outlet receptacles, and so forth) intended for
3.1.12 nominal system voltage, n—anominalvalueassigned
to designate a system of a given voltage class in accordance connecting the load(s) to be protected. This device is series-
connected such that load current will flow through the transient
with ANSI/IEEE C84.1. For the purpose of this standard,
nominal system voltages are 120, 208, 240, and 480 vac. All voltage surge suppressor.
voltages in this standard are root-mean-square (rms) unless 3.1.24 voltage drop, n—voltage differential measured from
stated otherwise.All tolerances are expressed in percent of the
input terminals to output terminals under conditions of rated
nominal system voltage. load current for two-port surge suppressors.
3.1.13 one-port transient voltage surge suppressor, n—a
3.1.25 voltage protection level, n—a suppression rating (or
TVSShavingonesetofelectricalconnections(terminals,leads
ratings) in volts or kilovolts, selected by the manufacturer that
and the like) intended only for shunt-connection to the ac
is based on the measured limiting voltage determined during
power circuit, such that load current in the ac power circuit
surgetesting.Alsoreferredtoasthesuppressionvoltagerating.
bypasses the TVSS.
3.1.26 voltage spike, n—a voltage spike is a voltage change
3.1.14 peak overshoot voltage, n—maximum voltage above
of very short duration (100 µs to ⁄2 cycle). The standard
the voltage protection level (peak voltage minus suppression
1.2/50-µs lightning impulse, as defined byANSI/IEEE Std 4, is
voltage rating) across the suppressor output terminals during
the characteristic voltage spike used for test purposes.
initial response to a voltage spike.
3.1.27 voltage tolerance, n—voltage tolerance is the maxi-
3.1.15 power interface, n—the electrical points where the
mum permitted departure from nominal system voltage during
surge suppression device is electrically connected to the ac
normal operation, excluding transient voltage variations. Volt-
power system.
age tolerance includes variations such as those caused by load
3.1.16 rated rms voltage (varistor), n—maximum continu-
changes, switchboard meter error, and drift. Unless otherwise
ous sinusoidal rms voltage which may be applied to a varistor.
specified, voltage tolerance shall be considered to be 610 % of
3.1.17 response time (varistor), n—the time between the nominal system voltage.
point at which the wave exceeds the voltage protection level
(suppression voltage rating) and the peak of the voltage 4. Classification
overshoot.Forthepurposeofthisdefinition,voltageprotection
4.1 Surge suppressors covered in this specification shall be
level is defined with an 8/20 µs current waveform of the peak
classified by class and type.
current amplitude as the waveform used for this response time.
4.2 The two classes of surge suppressors covered in this
3.1.18 secondary surge arrestor, n—asurgeprotectordevice
specification are based on and reflect ANSI/IEEE C62.41
acceptable ahead of the service entrance equipment on circuits
locations.
not exceeding 1000-Vrms (location category C as described in
ANSI/IEEE C62.41). 4.2.1 Class A—Surge suppressor associated with long cir-
cuitbranchthatbeinggreaterthan30-ftcabledistancefromthe
3.1.19 surge, n—a transient overvoltage superimposed on
distribution panel and usually installed as a series-connected
the ac power circuit.Avoltage surge is generally one in which
TVSS at the distribution system receptacle (wall outlet).
the superposition of the surge and normal power frequency
voltage involves peak voltage levels of twice or more the 4.2.2 Class B—Surge suppressor for short branch circuit,
normal voltage of the ac power system and generally lasting either installed at loads within 30-ft cable distance from the
not more than one-half period of the nominal system voltage circuit breaker distribution panel or within the distribution
waveform. panel.
F1507−99 (2022)
4.3 Type designations for surge suppressors covered in this
System frequency tolerance ±10 % of nominal frequency
B
Voltage protection level:
specification are as follows:
 120-V nominal suppressor ±350 V
4.3.1 Type I; Permanent Connected Type—A suppressor
 208-V, 240-V nominal suppressor ±700 V
designedforhard-wiredorpanel-mountapplications.Thistype
 480-V nominal suppressor ±1200 V
Maximum peak overshoot voltage Less than 250-V overvoltage protection
surge suppressor is the only one-port-type TVSS.
level for voltage spike with 5 kV/µs or
4.3.2 Type II; Plug-In Type—A suppressor provided with
lower rate of rise
blades for direct connection at a receptacle and with integral
Response time Less than 50 ns
Maximum leakage current Less than 30-mA line-line or line-ground
output receptacle(s). By nature of its design, a plug-in suppres-
Inrush current 10 times rated current for 10 cycles
sor is inserted into the circuit as a series connection.
Peak surge current 3000 A
4.3.3 Type III; Cord-Connected Type—A suppressor that is Operating temperature −10 to 60 °C
Storage temperature −40 to 85 °C
connected to a receptacle through a flexible cord that is
Minimum insulation resistance to 10 MΩ at 500 VDC
permanently attached to the suppressor device. The cord shall
case
be in accordance with requirements of UL 1449. Cord- Humidity resistance 0 to 100 %
Minimum life 2000 operations
connected devices shall not have means for permanent mount-
ing.
A
For two-port (plug-in and series-connected) suppressors only.
4.3.4 Type IV; Power Director (Power Center) Type—A
B
Measured line-to-line and line-to-neutral with an 8/20-µs, 3000-A peak waveform
suppressor unit with two-pole main circuit breaker, a master in accordance with ANSI/IEEE C62.41 applied.
switch for controlling all receptacle outlets, and individual
7.2 Operating Requirements:
switches for controlling all outlets.
7.2.1 Protection modes for all two-port hybrid surge protec-
tive devices shall provide protection for common mode (line-
5. Ordering Information
to-ground and neutral-to-ground) and normal mode (line-to-
5.1 Orders for suppressors under this specification shall
line) transients.
include the following:
7.2.2 Fails to an open (versus short) circuit unless otherwise
5.1.1 This specification number;
specified and provides indication (visual) of failure.
5.1.2 Nominal system voltage—120, 208, 240, and 480 V;
7.2.3 Capable of installation into a dedicated container for
5.1.3 Frequency—50, 60, and 400 Hz;
mounting or as an assembly or component of a switchboard or
5.1.4 Service—single-phase, three-phase delta, three-phase
power supply.
wye;
7.2.4 Maximum voltage drop for two-port devices at full
5.1.5 Load current;
current/voltage shall not exceed 0.25 % of nominal system
5.1.6 Surge suppressor—class and type;
voltage.
5.1.7 Protection modes;
7.3 Grounding Requirements:
5.1.8 Voltage protection level (suppression rating), if
7.3.1 The surge suppressor shall be provided with a means
known;
for grounding all exposed dead-metal parts that might become
5.1.9 Quantity;
energized. Grounding shall be accomplished in accordance
5.1.10 Testing requirements—include only if tests other
with the requirements of UL 1449.
thantheproductiontestsrequiredbythisspecificationaretobe
7.3.2 Type I (permanently connected) suppressors requiring
performed;
grounding shall have a field-wiring terminal or an insulated
5.1.11 Certification requirements; and
ground lead that is intended solely for connection of a
5.1.12 Packaging and shipping requirements.
grounding conductor.
7.3.3 The flexible cord of Types III and IV suppressors
6. Materials and Manufacture
which requires grounding shall have a grounding conductor
6.1 Materials—All materials used in the construction of
connected to the suppressor enclosure. Type II, direct plug-in,
these surge suppressors shall be of a quality suitable for the
suppressors requiring grounding shall be provided with a
purpose intended and shall conform to the requirements of this
grounding pin as one of the attachment plug contacts.
specification.
7.3.4 Any leads emanating from a suppressor are to be of
6.1.1 All metallic enclosures shall be either painted or
color coded insulated wire. The color green shall be used for
coated with corrosion resistant material.
the grounding conductor and shall not be used for any other
6.2 Manufacture—Plastic, when used, shall be a suitable
purpose.
thermoplastic or thermosetting material so molded as to
7.4 Supplementary Protection:
produce a dense solid structure, uniform in texture, finish, and
7.4.1 Surge protective devices that are series-connected
mechanical properties.
(Types II, III, and IV) shall have supplementary overcurrent
protection and overtemperature protection.
7. Requirements
7.4.2 Supplementary overcurrent protection using fuses
7.1 Performance Requirements:
shall be readily replaceable while circuit breaker protected
Maximum continuous operating 110 % of nominal voltage
devices shall be resettable.
voltage
7.4.3 Supplementary overcurrent protection shall interrupt
Temporary overvoltage withstand 120 % of nominal voltage for 2 s
A
Voltage drop Less than 0.25 % of nominal voltage at all phases of the source circuit plus the circuit neutral where
rated current
applicable to assure suppressor isolation of the load.
F1507−99 (2022)
7.4.4 Overtemperature protection shall sense suppressor 10.2.1 Maximum Continuous Operating Voltage—The three
enclosureorsuppressiondeviceovertemperatureconditionand test samples shall be placed in a controlled-temperature cham-
initiate opening of the voltage supply.
ber with an ambient temperature of 85 °C 6 5 °C and the rated
7.4.5 Suppressor supplementary protection shall provide a maximum continuous operating voltage shall be applied for a
visual or audible indication or both of the opening of the
period of 1000 h. The suppressor leakage currents shall be
protective device.
measured at the beginning of the test (after the suppressor
temperature has stabilized), and again after 1000 h. The
8. Enclosures
leakage currents at the conclusion of the test shall be less than
8.1 Unless specified differently by the purchaser, the sup-
30 mA and shall be less than 110 % of the initial leakage
pressor shall be packaged in a safety grounded enclosure with
current for each sample.
foundation attachments that meets the requirements of UL
10.2.2 Maximum Line-to-Ground Voltage—Ratedmaximum
1449.
continuous operating voltage shall be applied to the three test
8.1.1 The enclosure shall be capable of confining any
suppressorsbetweeneachlineterminalandgroundforaperiod
material that may be expelled during a catastrophic failure of
of 1 h. A single-phase voltage source may be applied between
any suppression device.
all line terminals (in parallel) and ground for this test. Leakage
current to ground shall not increase by more than 10 % at the
9. Receptacles
conclusion of this test.
9.1 Receptacles provided as part of a suppressor shall have
10.2.3 Temporary Overvoltage—The three test samples
a current rating not more that the current rating of the
shall be exposed to ten cycles of temporary overvoltage. Each
suppressor and a voltage rating consistent with rating of the
overvoltage cycle shall consist of 120 % of rated nominal
suppressor.
voltage for a period of 2 s followed by the maximum
9.2 All receptacles shall be of the grounding type.
continuousoperatingvoltageforaperiodof1min.Theleakage
currents shall not exceed 30 Ma and the leakage current
10. Design Tests
immediately following the 1-min period of the last cycle shall
10.1 Insulation Withstand Test—The assembled insulating
notexceed110 %ofthevalueobtainedattheconclusionofthe
members of the surge suppressor shall withstand impulse and
maximum continuous operating voltage test.
power-frequency voltages applied between each pair of line
10.3 Impulse Voltage-Time Tests—Theimpulsevoltage-time
terminals and between each line terminal and the grounded
tests demonstrate the suppressor’s ability to limit overvoltage
case. Internal parts designed to conduct to discharge impulses
in response to varying voltage spike rates of rise. Voltage
shall be removed or rendered inoperative to permit these tests.
impulses with fast (5–kV/µs) and slow (150–V/µs) rates of rise
10.1.1 Impulse Insulation Withstand—A 1.2/50 µs impulse
andofbothpolaritiesshallbeappliedbetweeneachsetofinput
voltage wave, as defined byANSI/IEEE Std 4, shall be applied
line terminals and between each line terminal and ground.
between each set of line terminals and between each line
Normal operating voltage need not be applied for these tests.
terminal and ground. The magnitude of the impulse voltage
The tests shall be performed on three samples, and the highest
shall be at least 1.2 times the sum of the voltage protection
crest voltage recorded at the output terminals shall be less than
level (suppression rating) and the maximum peak overshoot
the maximum peak voltage (voltage protection level plus peak
voltage, but need not exceed 6 Kv.
overshoot).The response time shall also be less than 50 ns. For
10.1.2 Power Frequency Insulation Withstand—An ac po-
one-port type suppressors, input and output terminals are the
tential of the nominal system frequency shall be applied for a
sameterminals.Wherethree-phasesuppressorsconsistofthree
period of 1 min between each set of line terminals and between
identical circuits, these tests need only be performed on one of
each line terminal and ground. The magnitude of the test
the three circuits in each sample. If the suppressor discharge
voltage shall be 1000 V plus twice nominal system voltage.
current exceeds 3000 amps, a resistance of up to 2Ω may be
The same test voltage magnitude shall be applied for line-to-
added in series with the surge generator to limit the current
line and line-to-ground tests.
after suppressor operation to 3000 amps.
10.2 Power Frequency Withstand Test—Power frequency
10.3.1 Fast-Front Impulse Suppression Tests—A 1.2/50-µs
withstand tests shall be performed to demonstrate the ability of
voltage impulse wave having a prospective crest voltage of
the surge suppressor to withstand sustained periods of opera-
6-kV (5-kV/µs rate of rise) shall be used for the fast-front test.
tion at the maximum continuous operating voltage and periods
Five impulses of each polarity shall be applied to each set of
of transient power frequency overvoltage without degradation.
terminals and the maximum peak voltage and response time
The power supply voltage, measured at the input terminals of
obtained line to line and line to ground shall be recorded.
the suppressor, shall be maintained as close as practicable to,
but not less than, the specified test voltage. Three suppressors 10.3.2 Slow-Front Impulse Suppression Tests—Slowfront
tests shall be performed using a voltage impulse with a
shall be connected across a power supply within the tolerances
of the nominal frequency. The power supply shall have a short prospective crest of 4.5 kV and a wavefront (time from zero to
crest) of 30 µs to 60 µs (approximately 150-V/µs rate of rise).
circuit capacity, measured at the suppressor input terminals, of
at least 500 amps. For multi-phase suppressors, tests shall be The time to half-crest value on the tail of the prospective
waveform should be at least twice the wavefront time. Five
performed for the assembled suppressor and power frequency
voltage shall be applied to all phases. impulses of each polarity shall be applied to each set of
F1507−99 (2022)
terminals and the maximum voltage and response time ob- overvoltages and clamping overvoltages determined by the
tained line-to-line and line-to-ground shall be recorded. previous tests are within 10 % for all three phases, only one
line-to-line and one line-to-ground test need be performed.
10.4 Voltage Protection Level Tests—The purpose of this
test is to determine the voltage protection provided by the 10.6 Life Cycle Tests—Life cycle tests establish the ability
of the suppressor to retain its voltage limiting function follow-
suppressor when passing a surge current. The voltage protec-
tion level shall be measured at the output terminals of the ing exposure to a large number of impulses equivalent to the
suppressor’s life expectancy.
suppressor using 8/20-µs current impulse waveforms of both
polarities applied to the input terminals. Three new spec
...