ASTM F1207M-96(2007)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F1207M −96(Reapproved 2007) An American National Standard
Standard Specification for
Electrical Insulation Monitors for Monitoring Ground
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 3.1.3 dc internal resistance—a monitor’s ohmic resistance
between the measuring and ground terminals.
1.1 This specification covers electrical insulation monitor-
3.1.4 input voltage—the supply voltage at the terminals of
ing devices, intended as permanently installed units, for use in
an insulation monitor.
the detection of ohmic insulation faults to ground in active, ac
ungrounded electrical systems.
3.1.5 measuring voltage—the output dc voltage from the
insulation monitor that is superimposed between the ac un-
1.2 Limitations—This specification does not cover devices
grounded system and ground.
which are not intended for operation for: dc ungrounded
systems or ac ungrounded systems with dc components unless
3.1.6 nominal contact voltage—the voltage rating for a
ac to dc conversion is isolated from the monitored system with
monitor’s internal relay contacts.
transformers.
3.1.7 nominal frequency—the frequency of a monitored
1.3 The values stated in SI units are to be regarded as the system.
standard. The values given in parentheses are for information
3.1.8 nominal voltage—the voltage (phase-to-phase) of a
only.
monitored system.
1.4 The following precautionary caveat pertains only to the
3.1.9 response value—the adjustable or preset set point
test methods portion, Section 9, of this specification: This
value of system insulation resistance for which an insulation
standard does not purport to address all of the safety concerns,
monitor will provide alarm indication.
if any, associated with its use. It is the responsibility of the user
3.1.10 system insulation resistance—the total insulation re-
of this standard to establish appropriate safety and health
sistance to ground to be monitored which is measured by dc
practices and determine the applicability of regulatory limita-
voltage.
tions prior to use.
4. Monitor Classification
2. Referenced Documents
4.1 Type 1—Insulationmonitorfor115-V,3-phaseorsingle-
2.1 UL Standard:
phase, 60-Hz, ac ungrounded electrical systems.
UL1053Ground-Fault Sensing and Relaying Equipment
4.2 Type 2—Insulationmonitorfor115-V,3-phaseorsingle-
3. Terminology
phase, 400-Hz, ac ungrounded systems.
3.1 Definitions:
4.3 Type 3—Insulationmonitorfor440-V,3-phaseorsingle-
3.1.1 ac internal resistance—a monitor’s impedance be-
phase, 60-Hz, ac ungrounded systems.
tween the measuring terminals and ground terminals.
4.4 Type 4—Insulationmonitorfor440-V,3-phaseorsingle-
3.1.2 ac ungrounded electrical system—a monitored system
phase, 400-Hz, ac ungrounded systems.
that has no intentional connection from phase or neutral to
4.5 Type 5—Insulationmonitorforupto1000-V,3-phaseor
ground and can continue to perform normally if one conductor
single-phase, 50 to 400-Hz, ac ungrounded systems.
becomes connected to ground.
5. Ordering Information
This specification is under the jurisdiction ofASTM Committee F25 on Ships
5.1 Monitoring devices shall be ordered by specifying the
and Marine Technology and is the direct responsibility of Subcommittee F25.10 on
following information:
Electrical.
Current edition approved May 1, 2007. Published June 2007. Originally
5.1.1 Nominal voltage and frequency.
approved in 1989. Last previous edition approved in 2002 as F1207M-96(2002).
5.1.2 Response value/set point range in kilohm.
DOI: 10.1520/F1207M-96R07.
5.1.3 Special options, that is, test buttons, ohmeters, visual
Available from Underwriters Laboratories (UL), 333 Pfingsten Rd.,
Northbrook, IL 60062-2096, http://www.ul.com. indicators, and so forth.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1207M − 96 (2007)
6. Requirements shall have creepage and air gap separation in accordance with
UL1053forvoltagesupto300V.Forhighernominalvoltages,
6.1 The measuring voltage shall not increase more than
see IEC Report 664.
10% when the monitor is supplied with 110% of the input
voltage.
7. Product Marking
6.2 The monitor shall be capable of both continuous and
7.1 The following data shall be identified on an insulation
on-demand operation.
monitor’s enclosure:
6.3 The monitor shall have provisions for an external
7.1.1 Name of manufacturer.
(remote)audibleorvisualalarmtooperatewhentheresistance
7.1.2 Type of monitor.
value falls below the response value or a remote indication of
7.1.3 Connection diagram.
theinsulationvalueoftheacungroundedsysteminkilohms,or 7.1.4 Nominal voltage rating.
both.
7.1.5 Input voltage.
7.1.6 Nominal frequency.
6.4 The ac internal resistance shall be at least 250-Ω/V
7.1.7 Response value or range.
nominalvoltage.Theminimumresistanceshallnotbelessthan
7.1.8 Test resistance value in accordance with 6.9.
15 kΩ.
7.1.9 Serial number, or year of production.
6.5 The dc internal resistance shall be at least 30-Ω/V
nominalvoltageandshalllimitthemeasuringdcoutputcurrent
8. Equipment Manual
from exceeding 12 mA.
8.1 The manufacturer’s equipment manual shall provide the
6.6 The monitor’s response tolerance shall not exceed
following information in addition to that required in 7.1:
65%ofthesetpointvalueatroomtemperature(25 65°C(72
8.1.1 Description of operation.
6 9°F)) and rated input voltage.
8.1.2 Values for ac and dc internal resistance.
8.1.3 Connection diagram.
6.7 When specified, insulation monitors shall be furnished
8.1.4 Nominal value of dc measuring voltage, based on
with adjustable response values and designed to preclude
possible supply voltages.
tampering or unauthorized changes.
8.1.5 Maximum dc measurement current at short-circuit
6.8 The insulation monitor shall reliably function in an
conditions.
ambient temperature range from 0 to 50°C (32 to 122°F).
8.1.6 Nominal contact voltage and current ratings for inte-
Storage temperatures of −20 to +60°C (−4 to 140°F) must not
gral relays in accordance with 6.12.
d
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