ASTM F1507-99(2017)

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: Historical
• Publication Date: 31-Jul-2017
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.10 - Electrical

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F1507 −99 (Reapproved 2017) 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 Aug. 1, 2017. Published August 2017. Originally
approved in 1994. Last previous edition approved in 2011 as F1507 – 99 (2011). Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
DOI: 10.1520/F1507-99R17. 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 (2017)
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 (2017)
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 sh
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F1507 − 99 (Reapproved 2011) F1507 − 99 (Reapproved 2017)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
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.
2. Referenced Documents
2.1 The following documents of the issue in effect on the date of material purchase form a part of this specification to the extent
referenced herein: herein.
2.2 AmericanAmerican National Standards:
ANSI/IEEE Std 4 IEEE Standard Techniques for High Voltage Testing
ANSI/IEEE C62.41 Recommended Practice on Surge Voltage in Low-Voltage AC Power Circuits
ANSI/IEEE C62.45 Guide on Surge Testing for Equipment Connected to Low-Voltage AC Power Circuits
ANSI/IEEE C84.1 Electrical Power Systems and Equipment—Voltage Ratings
This specification is under the jurisdiction of ASTM Committee F25 on Ships and Marine Technology and is the direct responsibility of Subcommittee F25.10 on
Electrical.
Current edition approved April 1, 2011Aug. 1, 2017. Published April 2011August 2017. Originally approved in 1994. Last previous edition approved in 20062011 as
F1507 – 99 (2011).(2006). DOI: 10.1520/F1507-99R11.10.1520/F1507-99R17.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1507 − 99 (2017)
2.3 Military Standard:
MIL-STD-1399 Section 300; Military Standard Interface Standard for Shipboard Systems, Section 300, Electric Power,
Alternating Current
2.4 Underwriters Laboratories Standard:
UL 1449 Transient Voltage Surge Suppressors, 2nd Edition
3. Terminology
3.1 Definitions:
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
harmonization of terms.
3.1.1 combination wave, n—a surge delivered by an instrument that has the inherent capability of applying a 1.2/50-μs voltage
wave across an open circuit and delivering an 8/20-μs current wave into a short circuit. The exact wave that is delivered is
determined by the instantaneous impedance to which the combination wave is applied. (Also called combination voltage/current
surge or combination V/I surge.)
3.1.2 crest (peak) value (of a wave, surge or impulse), n—the maximum value that a wave, surge, or impulse attains.
3.1.3 electric power source, n—the electric power that is supplied for testing.
3.1.4 electric power system ground, n—ground is a plane or surface used by the electric power system as a common reference
to establish zero potential. Usually, this surface is the metallic hull of the ship. On a nonmetallic hull ship, a special ground system
is installed for this purpose.
3.1.5 follow (power) current, n—the current from the connected power source that flows through a surge protective device
following the passage of discharge current.
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 considered to be 610 % of
nominal frequency.
3.1.7 inrush current, n—the inrush current is a sudden change in line current that occurs during startup or as a result of a change
to the operating mode. Inrush current is dependent on the type of load connected to the surge suppressor, and typically will rise
to a maximum value in a few milliseconds and decay to rated value in several milliseconds to several seconds.
3.1.8 leakage current, n—line current drawn, either line-to-line or line-to-ground, by the suppressor when operated at the
maximum continuous operating voltage.
3.1.9 maximum continuous operating voltage, n—maximum sinusoidal rms voltage which may be continuously applied without
degradation or deleterious effects.
3.1.10 measured limiting voltage, n—the crest (peak) value of the voltage measured at the leads, terminals, receptacle contacts
and the like, intended for connection to the load(s) to be protected, and resulting from application of a specified surge.
3.1.11 nominal frequency, n—the nominal frequency is the designated frequency in Hz.
3.1.12 nominal system voltage, n—a nominal value assigned to designate a system of a given voltage class in accordance with
ANSI/IEEE C84.1. For the purpose of this standard, nominal system voltages are 120, 208, 240, and 480 vac. All voltages in this
standard are root-mean-square (rms) unless stated otherwise. All tolerances are expressed in percent of the nominal system voltage.
3.1.13 one-port transient voltage surge suppressor, n—a TVSS having one set of electrical connections (terminals, leads and the
like) intended only for shunt-connection to the ac power circuit, such that load current in the ac power circuit bypasses the TVSS.
3.1.14 peak overshoot voltage, n—maximum voltage above the voltage protection level (peak voltage minus suppression
voltage rating) across the suppressor output terminals during initial response to a voltage spike.
3.1.15 power interface, n—the electrical points where the surge suppression device is electrically connected to the ac power
system.
3.1.16 rated rms voltage (varistor), n—maximum continuous sinusoidal rms voltage which may be applied to a varistor.
3.1.17 response time (varistor), n—the time between the point at which the wave exceeds the voltage protection level
(suppression voltage rating) and the peak of the voltage overshoot. For the purpose of this definition, voltage protection level is
defined with an 8/20-μs current waveform of the peak current amplitude as the waveform used for this response time.
3.1.18 secondary surge arrestor, n—a surge protector device acceptable ahead of the service entrance equipment on circuits not
exceeding 1000-V rms (location category C as described in ANSI/IEEE C62.41).
3.1.19 surge, n—a transient overvoltage superimposed on the ac power circuit. A voltage surge is generally one in which the
superposition of the surge and normal power frequency voltage involves peak voltage levels of twice or more the normal voltage
of the ac power system and generally lasting not more than one-half period of the nominal system voltage waveform.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, DLA Document Services, Building 4/D, 700 Robbins Ave., Philadelphia, PA
19111-5098, http://dodssp.daps.dla.mil.19111-5094, http://quicksearch.dla.mil.
Available from Underwriters Laboratories (UL), 2600 N.W. Lake Rd., Camas, WA 98607-8542, http://www.ul.com.
F1507 − 99 (2017)
3.1.20 surge protective device (SPD), n—a protective device composed of any combination of linear or non-linear circuit
elements and intended for limiting surge voltages on equipment by diverting or limiting surge current; it prevents continued flow
of follow (power) current and is capable of repeating these functions as specified.
3.1.21 temporary overvoltage (TOV), n—a voltage swell from a sudden change in voltage which goes outside the voltage
tolerance limits but does not exceed 120 % of nominal system voltage and returns to and remains within these limits within 2 s
after the initiation of the disturbance.
3.1.22 transient voltage surge suppressor (TVSS), n—a surge protective device intended for connection electrically on the load
side of the main overcurrent protection in circuits not exceeding 600 V. (Location Categories A and B as described in ANSI/IEEE
C62.41.)
3.1.23 two-port transient voltage surge suppressor, n—a TVSS having one set of electrical connections (terminals, leads and the
like) intended for connection to the ac power circuit and one or more separate sets of electrical connections (terminals, leads, outlet
receptacles, and so forth) intended for connecting the load(s) to be protected. This device is series-connected such that load current
will flow through the transient voltage surge suppressor.
3.1.24 voltage drop, n—voltage differential measured from input terminals to output terminals under conditions of rated load
current for two-port surge suppressors.
3.1.25 voltage protection level, n—a suppression rating (or ratings) in volts or kilovolts, selected by the manufacturer that is
based on the measured limiting voltage determined during surge testing. Also referred to as the suppression voltage rating.
3.1.26 voltage spike, n—a voltage spike is a voltage change of very short duration (100 μs to ⁄2 cycle). The standard 1.2/50-μs
lightning impulse, as defined by ANSI/IEEE Std 4, is the characteristic voltage spike used for test purposes.
3.1.27 voltage tolerance, n—voltage tolerance is the maximum permitted departure from nominal system voltage during normal
operation, excluding transient voltage variations. Voltage tolerance includes variations such as those caused by load changes,
switchboard meter error, and drift. Unless otherwise specified, voltage tolerance shall be considered to be 610 % of nominal
system voltage.
3.2 power interface—The electrical points where the surge suppression device is electrically connected to the ac power system.
3.3 combination wave—A surge delivered by an instrument that has the inherent capability of applying a 1.2/50-μs voltage wave
across an open circuit and delivering an 8/20-μs current wave into a short circuit. The exact wave that is delivered is determined
by the instantaneous impedance to which the combination wave is applied. (Also called combination voltage/current surge or
combination V/I surge.)
3.4 crest (peak) value (of a wave, surge or impulse)—The maximum value that a wave, surge, or impulse attains.
3.5 electric power source—The electric power that is supplied for testing.
3.6 electric power system ground—Ground is a plane or surface used by the electric power system as a common reference to
establish zero potential. Usually, this surface is the metallic hull of the ship. On a nonmetallic hull ship, a special ground system
is installed for this purpose.
3.7 follow (power) current—The current from the connected power source that flows through a surge protective device
following the passage of discharge current.
3.8 frequency tolerance—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 considered to be 610 % of
nominal frequency.
3.9 inrush current—The inrush current is a sudden change in line current that occurs during startup or as a result of a change
to the operating mode. Inrush current is dependent on the type of load connected to the surge suppressor, and typically will rise
to a maximum value in a few milliseconds and decay to rated value in several milliseconds to several seconds.
3.10 leakage current—Line current drawn, either line-to-line or line-to-ground, by the suppressor when operated at the
maximum continuous operating voltage.
3.11 maximum continuous operating voltage—Maximum sinusoidal rms voltage which may be continuously applied without
degradation or deleterious effects.
3.12 measured limiting voltage—The crest (peak) value of the voltage measured at the leads, terminals, receptacle contacts and
the like, intended for connection to the load(s) to be protected, and resulting from application of a specified surge.
3.13 nominal frequency—the nominal frequency is the designated frequency in Hz.
3.14 nominal system voltage—A nominal value assigned to designate a system of a given voltage class in accordance with
ANSI/IEEE C84.1. For the purpose of this standard, nominal system voltages are 120, 208, 240, and 480 vac. All voltages in this
standard are root-mean-square (rms) unless stated otherwise. All tolerances are expressed in percent of the nominal system voltage.
3.15 one-port transient voltage surge suppressor—A TVSS having one set of electrical connections (terminals, leads and the
like) intended only for shunt-connection to the ac power circuit, such that load current in the ac power circuit bypasses the TVSS.
F1507 − 99 (2017)
3.16 peak overshoot voltage—Maximum voltage above the voltage protection level (peak voltage minus suppression voltage
rating) across the suppressor output terminals during initial response to a voltage spike.
3.17 rated rms voltage (varistor)—Maximum continuous sinusoidal rms voltage which may be applied to a varistor.
3.18 response time (varistor)—The time between the point at which the wave exceeds the voltage protection level (suppression
voltage rating) and the peak of the voltage overshoot. For the purpose of this definition, voltage protection level is defined with
an 8/20-μs current waveform of the peak current amplitude as the waveform used for this response time.
3.19 secondary surge arrestor—A surge protector device acceptable ahead of the service entrance equipment on circuits not
exceeding 1000-V rms (loc
...