ASTM F1207M-12

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: F1207M −12 An American National Standard
Standard Specification for
Electrical Insulation Monitors for Monitoring Ground
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Resistance in Active Electrical Systems [Metric]
This standard is issued under the fixed designation F1207M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1 AC internal resistance—a monitor’s impedance be-
tween the measuring terminals and ground terminals.
1.1 This specification covers electrical insulation monitor-
ing devices intended as permanently installed units for use in 3.1.2 AC ungrounded electrical system—a monitored sys-
the detection of ohmic insulation faults to ground in activeAC
tem that has no intentional connection from phase or neutral to
ungrounded electrical systems. ground and can continue to perform normally if one conductor
becomes connected to ground.
1.2 Limitations—This specification does not cover devices
which are not intended for operation for: DC ungrounded
3.1.3 DC internal resistance—a monitor’s ohmic resistance
systems or AC ungrounded systems with DC components
between the measuring and ground terminals.
unless AC to DC conversion is isolated from the monitored
3.1.4 input voltage—the supply voltage at the terminals of
system with transformers.
an insulation monitor.
1.3 The values stated in SI units are to be regarded as the
3.1.5 measuring voltage—the output DC voltage from the
standard. The values given in parentheses are for information
insulation monitor that is superimposed between the AC
only.
ungrounded system and ground.
1.4 The following precautionary caveat pertains only to the
3.1.6 nominal contact voltage—the voltage rating for a
test methods portion, Section 9, of this specification: This
monitor’s internal relay contacts.
standard does not purport to address all of the safety concerns,
if any, associated with its use. It is the responsibility of the user 3.1.7 nominal frequency—the frequency of a monitored
of this standard to establish appropriate safety, health, and system.
environmental practices and determine the applicability of
3.1.8 nominal voltage—the voltage (phase-to-phase) of a
regulatory limitations prior to use.
monitored system.
1.5 This international standard was developed in accor-
3.1.9 response value—the adjustable or preset set point
dance with internationally recognized principles on standard-
value of system insulation resistance for which an insulation
ization established in the Decision on Principles for the
monitor will provide alarm indication.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
3.1.10 system insulation resistance—the total insulation re-
Barriers to Trade (TBT) Committee.
sistance to ground to be monitored, which is measured by DC
voltage.
2. Referenced Documents
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4. Monitor Classification
2.1 UL Standard:
UL1053Ground-Fault Sensing and Relaying Equipment
4.1 Type 1—Insulationmonitorfor115-V,3-phaseorsingle-
phase, 60-Hz, AC ungrounded electrical systems.
3. Terminology
4.2 Type 2—Insulationmonitorfor115-V,3-phaseorsingle-
3.1 Definitions:
phase, 400-Hz, AC ungrounded systems.
4.3 Type 3—Insulationmonitorfor440-V,3-phaseorsingle-
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This specification is under the jurisdiction ofASTM Committee F25 on Ships
phase, 60-Hz, AC ungrounded systems.
and Marine Technology and is the direct responsibility of Subcommittee F25.10 on
Electrical.
4.4 Type 4—Insulationmonitorfor440-V,3-phaseorsingle-
Current edition approved Oct. 1, 2012. Published November 2012. Originally
phase, 400-Hz, AC ungrounded systems.
approved in 1989. Last previous edition approved in 2007 as F1207M–96 (2007).
DOI: 10.1520/F1207M-12.
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4.5 Type 5—Insulationmonitorforupto1000-V,3-phaseor
Available from Underwriters Laboratories (UL), 333 Pfingsten Rd.,
Northbrook, IL 60062-2096, http://www.ul.com. single-phase, 50 to 400-Hz, AC ungrounded systems.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F1207M − 12
5. Ordering Information 6.12 Built-in relays for connection to external alarms shall
have a switching capacity of at least 2Aat 250-VAC or 0.5A
5.1 Monitoring devices shall be ordered by specifying the
at 120-V DC.
following information:
6.13 Between isolated, outgoing circuits and between these
5.1.1 Nominal voltage and frequency.
circuits and extraneous conductive parts, insulation monitors
5.1.2 Response value/set point range in kilohm.
shall have creepage and air gap separation in accordance with
5.1.3 Special o
...