ASTM F1669M Standard Specification for Insulation Monitors for Shipboard Electrical Systems [Metric]
ASTM F1669M船上電氣系統絕緣監控器規格（米制）
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.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. 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.
2. Referenced Documents (purchase separately)
UL Standard
ULSTD840 Insulation Coordination Including Clearances and Creepage Distances for Electrical Equipment
IEC Standards
IEC364-4-41 Electrical Installations of Buildings/Protection for Safety/Protection Against Electrical Shock
Military Standard
MIL-STD-1399 (NAVY) Section 300A Interface Standards for Shipboard Systems; Electrical Power, Alternating Current
Index Terms
ac electrical systems; dc components; dc electrical systems; electrical insulation monitoring; electrical systems; ohmic insulation faults;
