ASTM F1669M-96

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

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.  
1.4 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: 31-Dec-1995
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.10 - Electrical

Standards Content (Sample)

Designation: F 1669M – 96 An American National Standard [METRIC]
METRIC
Standard Specification for
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Insulation Monitors for Shipboard Electrical Systems [\]
This standard is issued under the fixed designation F 1669M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope for Shipboard Systems; Electrical Power, Alternating
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Current
1.1 This specification covers two (2) types of electrical
system insulation monitoring devices.
3. Terminology
1.1.1 Type I is an ac 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
3.1.1 ac or dc ungrounded electrical system, n—a system
to ground in active ac ungrounded electrical systems up to
that has no intentional connection to ground and can continue
1000 VAC, having dc components up to 1500 VDC.
to perform normally if one conductor becomes connected to
1.1.2 Type II is a dc device intended as a permanently
ground.
installed unit for use in the detection of ohmic insulation faults
3.1.2 measuring signal, n—the output signal from the insu-
to ground in dc ungrounded electrical systems up to 1500
lation monitor that is superimposed between the ac or dc
VDC.
ungrounded system to be monitored and ground.
1.2 Limitations—This specification does not cover devices
3.1.3 response value, n—the adjustable or preset set-point
that are intended for operation in ac ungrounded systems
value of the system insulation resistance at which an insulation
without dc components.
monitor will provide an alarm indication.
1.3 The values stated in SI units are to be regarded as the
3.1.4 system leakage capacitance, n—the total capacitance
standard. The values given in parentheses are for information
to ground of the system including all connected consumers.
only.
3.1.5 touch voltage, n—the voltage appearing during an
1.4 The following precautionary caveat pertains only to the
insulation fault, between simultaneously accessible parts. This
test methods portion, Section 7 of this specification: This
term is used only in connection with protection against indirect
standard does not purport to address all of the safety concerns,
human contacts, that is, no direct human contact with a live
if any, associated with its use. It is the responsibility of the user
conductor. The International Electrotechnical Commission
of this standard to establish appropriate safety and health
(IEC) limits the maximum prospective touch voltage which can
practices and determine the applicability of regulatory limita-
be maintained indefinitely to 50 VAC rms or 120 V ripple-free
tions prior to use.
dc.
2. Referenced Documents
4. Ordering Information
2.1 UL Standard:
4.1 Orders for monitoring devices under this specification
UL STD 840 Insulation Coordination Including Clearances
2 shall state the following information:
and Creepage Distances for Electrical Equipment
4.1.1 Type and quantity.
2.2 IEC Standards:
3 4.1.2 Nominal system voltage and frequency (for ac sys-
IEC 255-5 Insulation Tests for Electrical Relays
tem).
IEC 364-4-41 Electrical Installations of Buildings/
3 4.1.3 Input supply voltage.
Protection for Safety/Protection Against Electrical Shock
4.1.4 Response value/set-point range expressed in K-Ohms.
2.3 Military Standard:
4.1.5 ASTM designation and year of issue.
MIL-STD-1399 (NAVY) Section 300A Interface Standards
4.1.6 System leakage capacitance or data from which an
estimate of its magnitude can be determined.
4.1.7 Special requirements such as Test/Reset buttons, ohm-
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meters, visual indicators, memory fault retention, etc.
This specification is under the jurisdiction of ASTM Committee F-25 on
Shipbuilding and is the direct responsibility of Subcommittee F25.10 in Electrical,
Electronics and Automation.
5. Materials and Manufacturing Methods
Current edition approved June 10, 1996. Published August 1996.
2 5.1 The materials and manufacturing methods used shall be
Available from Underwriters Laboratories, Inc., 333 Pfingsten Rd., Northbrook,
IL 60062.
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Available from American National Standards Institute, 11 W. 42nd St., 13th 4
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
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F 1669M
such that the resulting products will conform to the properties and over surface (creepage) as stated in UL STD 840 for the
and characteristics prescribed in this specification. intended maximum circuit voltage.
6.10 Impulse Voltage Withstand Tests—The insulation
6. Performance Requirements
monitor shall meet the IEC 255-5 Clas
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