IS 9858 : 1981 Safety requirements for electronic measuring apparatus

1 Scope

1.1 This standard applies to This apparatus, whether or notdesigned for mains supply :

a) electronic measuring apparatus;

b) accessories used with electronic measuring apparatus,including auxiliary apparatus and supply apparatus; and

c) electronic accessories for non-electronic measuringinstruments.

1.2 This standard applies to apparatus for indoor use.

NOTE 1 - The conditions for indoor use are specified by theUsage Group 1 of IS 9176 : 1979. These values indicate theconditions of safe operation of apparatus designed and tested inaccordance with this standard. Such apparatus may occasionally besubjected to temperatures between + 5� and - 10�C without degradation of their safety.

NOTE 2 - Requirements for apparatus to be used under the moresevere environmental conditions of Usage Group II or III may bedealt with in the future.

NOTE 3 - For apparatus to be used in special areas, such as coalmines or aircraft, as also for drip-proof or splash-proofapparatus, different or additional requirements may apply.

1.3 This standard does not apply to electronic measuringapparatus in medical diagnostic and therapeutic applications. Therequirements for such apparatus are contained in IS 8607 : Part I :19771.

1.4 For electronic measuring apparatus used in connection withionizing radiation, additional requirements may apply.

1.5 This standard may not be appropriate for:

a) some types of direct indicating -instruments and some typesof recording instruments, or parts of them, containing electronicdevices (see 3.2);

b) apparatus designed for a rated supply voltage exceeding:

i) 480 V (rms) between phases for apparatus for three-phasesupply, and

ii) 250 V (rms) for all other apparatus;

c) electronic apparatus whose measuring function is usedexclusively for control purposes.

1.6 This standard is concerned with safety only and not with theother properties of electronic measuring apparatus (see 3).

2 References

IS 2 :1960Rules for rounding off numerical values

IS 434 : Part I :1964 Rubber-insulated cables: Part I With copper conductors

IS 616 :1981Safety requirements for mains-operatedelectronic and related apparatus for householdand similar general use

IS 694 :1977PVC insulated cables for working voltages upto and including 1 100 volts

IS 2106 : Part XVI :1971 Environmental test for electronic andelectrical equipment:Part XVI Vibration test

IS 3452 : Part I :1966 Toggle switches:Part I General requirements and tests

IS 3452 : Part II :1970 Toggle switches:Part II Toggle switches, Types I and II

IS 3723 : Part I :1973 Capacitor for radiointerference suppression:Part I General requirements and methods of test

IS 6089 : Part I :1971 Sensitive switches:Part I General requirements and tests

IS 6756 :1972Technical documentation to be supplied withelectronic measuring equipment

IS 8145 :1976Test chambers of non-injection type forconstant relative humidity

IS 8607 : Part I :1977 General and safetyrequirements for electricalequipment used in medical practice:Part I General

IS 9176 :1979Method for specifying the functionalperformance of the electronic measuringequipment

IS 9249 : Part I :1979 Safety requirements forindcating andrecording electrical measuring instruments andtheir accessories:Part I Common safety requirements forinstruments