ASTM_F_1669M_-_12.pdf

Designation:F1669M12An American National StandardStandard Specification forInsulation Monitors for Shipboard Electrical SystemsMetric1This standard is issued under the fixed designation F1669M;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers two(2)types of electricalsystem insulation monitoring devices.1.1.1 Type I is an AC device intended as a permanentlyinstalled unit for use in the detection of ohmic insulation faultsto ground in active AC ungrounded electrical systems up to1000 VAC,having DC components up to 1500 VDC.1.1.2 Type II is a DC device intended as a permanentlyinstalled unit for use in the detection of ohmic insulation faultsto ground in DC ungrounded electrical systems up to 1500VDC.1.2 LimitationsThis specification does not cover devicesthat are intended for operation in AC ungrounded systemswithout DC components.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 The following precautionary caveat pertains only to thetest methods portion,Section 7 of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 UL Standard:UL STD 840 Insulation Coordination Including Clearancesand Creepage Distances for Electrical Equipment22.2 IEC Standards:3IEC 255-5 Insulation Tests for Electrical RelaysIEC 364-4-41 ElectricalInstallationsofBuildings/Protection for Safety/Protection Against Electrical Shock2.3 Military Standard:MIL-STD-1399(NAVY)Section 300A Interface Standardsfor Shipboard Systems;Electrical Power,AlternatingCurrent43.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 AC or DC ungrounded electrical system,na systemthat has no intentional connection to ground and can continueto perform normally if one conductor becomes connected toground.3.1.2 measuring signal,nthe output signal from the insu-lation monitor that is superimposed between the AC or DCungrounded system to be monitored and ground.3.1.3 response value,nthe adjustable or preset set-pointvalue of the system insulation resistance at which an insulationmonitor will provide an alarm indication.3.1.4 system leakage capacitance,nthe total capacitanceto ground of the system including all connected consumers.3.1.5 touch voltage,nthe voltage appearing during aninsulation fault,between simultaneously accessible parts.Thisterm is used only in connection with protection against indirecthuman contacts,that is,no direct human contact with a liveconductor.The International Electrotechnical Commission(IEC)limits the maximum prospective touch voltage which canbe maintained indefinitely to 50 VAC rms or 120 V ripple-freeDC.4.Ordering Information4.1 Orders for monitoring devices under this specificationshall state the following information:4.1.1 Type and quantity.4.1.2 Nominal system voltage and frequency(for AC sys-tem).4.1.3 Input supply voltage.4.1.4 Response value/set-point range expressed in K-Ohms.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.10 inElectrical.Current edition approved Oct.1,2012.Published November 2012.Originallyapproved in 1996.Last previous edition approved in 2007 as F1669M-96(2007).DOI:10.1520/F1669M-12.2Available from Underwriters Laboratories(UL),333 Pfingsten Rd.,Northbrook,IL 60062-2096,http:/.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5098,Attn:NPODS.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.5 ASTM designation and year of issue.4.1.6 System leakage capacitance or data from which anestimate of its magnitude can be determined.4.1.7 Special requirements such as Test/Reset buttons,ohmmeters,visual indicators,memory fault retention,and soforth.5.Materials and Manufacturing Methods5.1 The materials and manufacturing methods used shall besuch that the resulting products will conform to the propertiesand characteristics prescribed in this specification.6.Performance Requirements6.1 Response of Insulation Monitor to a Step Input Theinsulation monitor measures the combined parallel resistanceto ground from all power or circuit conductors.The time torespond to a step change in the actual resistance to a value lessthan or equal to 50%of the desired res