ASTM F1669M-96(2007)

Standard Specification for Insulation Monitors for Shipboard Electrical Systems [Metric]

ABSTRACT
This specification covers insulation monitoring devices for shipboard electrical systems. Materials covered by this specification include Type I (ac device) and Type II (dc device) electrical system insulation monitoring devices used in the detection of ohmic insulation faults to ground in either active ac ungrounded electrical systems with dc components (Type I) or dc ungrounded electrical systems (Type II). However, devices used in ac ungrounded systems without dc components are not included. The devices shall undergo conformance and routine tests to ensure that the device meets the requirements specified. Conformance tests shall included testing of response time, peak voltage, input impedance or resistance, built-in meters, and impulse voltage withstand capabilities, whereas routine tests shall include testing of response value, self-test function, built-in meters, and voltage.
SCOPE
1.1 This specification covers two (2) types of electrical system insulation monitoring devices.
1.1.1 Type I is an ac device intended as a permanently installed unit for use in the detection of ohmic insulation faults to ground in active ac ungrounded electrical systems up to 1000 VAC, having dc components up to 1500 VDC.
1.1.2 Type II is a dc device intended as a permanently installed unit for use in the detection of ohmic insulation faults to ground in dc ungrounded electrical systems up to 1500 VDC.
1.2 Limitations - This specification does not cover devices that are intended for operation in ac ungrounded systems without dc components.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
The following precautionary caveat pertains only to the test methods portion, Section 7 of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 30-Apr-2007
• ICS: 47.020.60 - Electrical equipment of ships and of marine structures
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.10 - Electrical

Relations

• Replaces: ASTM F1669M-96(2002) - Standard Specification for Insulation Monitors for Shipboard Electrical Systems [Metric]
• Effective Date: 01-May-2007
• Replaced By: ASTM F1669M-12 - Standard Specification for Insulation Monitors for Shipboard Electrical Systems [Metric]
• Effective Date: 01-Oct-2012

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: F1669M −96(Reapproved 2007) An American National Standard
Standard Specification for
Insulation Monitors for Shipboard Electrical Systems
[Metric]
This standard is issued under the fixed designation F1669M; 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 IEC 364-4-41 Electrical Installations of Buildings/
Protection for Safety/Protection Against Electrical Shock
1.1 This specification covers two (2) types of electrical
2.3 Military Standard:
system insulation monitoring devices.
MIL-STD-1399(NAVY) Section 300A Interface Standards
1.1.1 Type I is an ac device intended as a permanently
for Shipboard Systems; Electrical Power, Alternating
installed unit for use in the detection of ohmic insulation faults
Current
to ground in active ac ungrounded electrical systems up to
1000 VAC, having dc components up to 1500 VDC.
3. Terminology
1.1.2 Type II is a dc device intended as a permanently
3.1 Definitions of Terms Specific to This Standard:
installed unit for use in the detection of ohmic insulation faults
to ground in dc ungrounded electrical systems up to 1500 3.1.1 ac or dc ungrounded electrical system, n—a system
that has no intentional connection to ground and can continue
VDC.
to perform normally if one conductor becomes connected to
1.2 Limitations—This specification does not cover devices
ground.
that are intended for operation in ac ungrounded systems
3.1.2 measuring signal, n—the output signal from the insu-
without dc components.
lation monitor that is superimposed between the ac or dc
1.3 The values stated in SI units are to be regarded as the
ungrounded system to be monitored and ground.
standard. The values given in parentheses are for information
3.1.3 response value, n—the adjustable or preset set-point
only.
valueofthesysteminsulationresistanceatwhichaninsulation
1.4 The following precautionary caveat pertains only to the
monitor will provide an alarm indication.
test methods portion, Section 7 of this specification:This
3.1.4 system leakage capacitance, n—the total capacitance
standard does not purport to address all of the safety concerns,
to ground of the system including all connected consumers.
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health 3.1.5 touch voltage, n—the voltage appearing during an
practices and determine the applicability of regulatory limita-
insulation fault, between simultaneously accessible parts. This
tions prior to use. termisusedonlyinconnectionwithprotectionagainstindirect
human contacts, that is, no direct human contact with a live
2. Referenced Documents
conductor. The International Electrotechnical Commission
(IEC)limitsthemaximumprospectivetouchvoltagewhichcan
2.1 UL Standard:
be maintained indefinitely to 50 VAC rms or 120 V ripple-free
UL STD840Insulation Coordination Including Clearances
2 dc.
and Creepage Distances for Electrical Equipment
2.2 IEC Standards:
4. Ordering Information
IEC255-5Insulation Tests for Electrical Relays
4.1 Orders for monitoring devices under this specification
shall state the following information:
4.1.1 Type and quantity.
This specification is under the jurisdiction ofASTM Committee F25 on Ships
4.1.2 Nominal system voltage and frequency (for ac sys-
and Marine Technology and is the direct responsibility of Subcommittee F25.10 in
Electrical. tem).
Current edition approved May 1, 2007. Published June 2007. Originally
4.1.3 Input supply voltage.
approved in 1996. Last previous edition approved in 2002 as F1669M-96(2002).
4.1.4 Response value/set-point range expressed in K-Ohms.
DOI: 10.1520/F1669M-96R07.
Available from Underwriters Laboratories (UL), 333 Pfingsten Rd.,
Northbrook, IL 60062-2096, http://www.ul.com.
3 4
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St., AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
4th Floor, New York, NY 10036, http://www.ansi.org. Robbins Ave., Philadelphia, PA 19111-5098, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1669M − 96 (2007)
4.1.5 ASTM designation and year of issue. connection to an external alarm shall have a continuous rating
4.1.6 System leakage capacitance or data from which an of at least 4 amperes at 250 VAC. The break capacity shall be
estimate of its magnitude can be determined. at least 2 amps at 250 VAC (0.7 power factor) and 0.3 amps at
4.1.7 SpecialrequirementssuchasTest/Resetbuttons,ohm- 120 VDC.
meters, visual indicators, memory fault retention, and so forth.
6.8 Built-In Display of Insulation Resistance—If provisions
are made to indicate (display) the current insulation resistance
5. Materials and Manufacturing Methods
level,thenthemanufacturershallprovideinformationastothe
5.1 The materials and manufacturing methods used shall be
accuracyofthisindicationduringnormaloperatingconditions.
such that the resulting products will conform to the properties
6.9 Clearance and Creepage Distances—The insulation
and characteristics prescribed in this specification.
monitor shall have protective spacings through air (clearance)
and over surface (creepage) as stated in UL STD 840 for the
6. Performance Requirements
intended maximum circuit voltage.
6.1 Response of Insulation Monitor to a Step Input —The
6.10 Impulse Voltage Withstand Tests—The insulation
insulation monitor measures the combined parallel resistance
monitor shall meet the IEC 255-5 Class III Impulse Voltage
to ground from all power or circuit conductors. The time to
Withstand Test Requirements.
respond to a step change in the actual resistance to a value less
than or equal to 50% of the desired response value shall be
7. Operating Environment
governed by the expression:
7.1 The insulation monitor shall reliably function over an
t ~s!# 100140 ~R 3 C ! (1)
I s
ambient temperature range of 0 to 50°C (32 to 122°F) and at a
relative humidity of 95%. Storage temperatures of −20 to
where:
+60°C (−4 to 140°F) shall not damage the insulation monitor.
R = internal resistance of monitor, ohm, and
I
C = total system capacitance, farad.
s 8. Test Methods
For example,
8.1 Conformance Test—Conformance testing of insulation
monitors shall be performed to confirm that the response
t 5 124sifR 5 120000 ohm and C 5 5 310
I s
farad. tolerances stipulated are not exceeded and that the require-
ments of Section 6 are met.
6.2 Measuring Signal Voltage Limits—Thepeakvalueofthe
8.1.1 Response Value Tests—The measuring devices used
measuringsignalshallunderalloperatingconditionsbelimited
for testing shall enable a slow stepless or step-by-step change
to a magnitude deemed acceptable by applicable safety stan-
of the simulated insulation resistance and shall allow the
dards for the intended use. The peak value of the measuring
connection of artificial system leakage capacitances. To simu-
signal shall be less than the touch voltage limits: 120 VDC
late the system leakage capacitance, capacitors with an isola-
ripple-free and 50 VAC rms.
tionresistanceof100timesthedesiredresponsevalueandwith
6.3 Internal Impedance and Internal Resistance—The ac
a tolerance of +10% maximum shall be used. On testing, the
internal impedance and dc internal resistance shall be at least
resistance shall be decreased slowly and the insulation moni-
30 ohms per volt nominal system voltage but in either case
tor’sresponseshallbeobserved.Fortestingtheresponsevalue,
shall not be less than 12 K-Ohms.
the test arrangement with its insulat
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