AS IEC-60990-2018 pdf download.Methods of measurement of touch current and protective conductor current.
I Scope
This International Standard defines measurement methods for
— d.c. or a.c. current of sinusoidal or non-sinusoidal waveform, which could flow through the human body, and
— current flowing through a protective conductor.
The measuring methods recommended for TOUCH CURRENT are based upon the possible effects of current flowing through a human body. In this standard, measurements of current through networks representing the impedance of the human body are referred to as measurements of TOUCH CURRENT. These networks are not necessarily valid for the bodies of animals.
The specification or implication of specific limit values is not within the scope of this standard. IEC TS 60479 series provides information regarding the effects of current passing through the human body from which limit values may be derived.
This standard is applicable to all classes of EQUIPMENT, according to IEC 61140.
The methods of measurement in this standard are not intended to be used for
— TOUCH CURRENTS having less than 1 s duration,
— patient currents as defined in IEC 60601-1,
— a.c. at frequencies below 15 Hz, and
— currents above those chosen for ELECTRIC BURN limits.
This basic safety publication is primarily intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51. It is not intended for use by manufacturers or certification bodies independent of product standards.
One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements, test methods or test conditions of this basic safety publication only apply when specifically referred to or included in the relevant publications.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC TS 60479-1:2005, Effects of current on human beings and livestock — Part 1: General aspects
IEC TS 60479-2:2007, Effects of current on human beings and livestock — Part 2: Special aspects
© Standards Australia LimIted 2018
AS IEC 60990:2018
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IEC 61140, Protection against electric shock — Common aspects for installation and
equipment
ISO/IEC Guide 51:2014, Safety aspects — Guidelines for their inclusion in standards
IEC Guide 104:2010, The preparation of safety publications and the use of basic safety publications and group safety publications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 TOUCH CURRENT
electric current through a human body or through an animal body when it touches one or more accessible parts of an installation or of EQUIPMENT
(SOURCE: IEC 60050-195:1998, 195-05-21]
3.2 PROTECTIVE CONDUCTOR CURRENT
current which flows in a protective conductor
3.3 EQUIPMENT
organized Collection of electromechanical component parts and features to accomplish a defined task (as specified in the relevant product standard).
Note 1 to entry: If not specified In the relevant standard, see Annex A.
3.4 GRIPPABLE PART
part of the EQUIPMENT which could supply current through the human hand to cause muscular contraction around the part and an Inability to let go
Note 1 to entry: Parts which are intended to be gripped with the entire hand are assumed to be grippable without further investigation,
3.5 ELECTRIC BURN
burning of the skin or of an organ, caused by passing an electric current across or through the surface
[SOURCE: IEC 60050-604:1987, 604-04-18]
4 Test site
4.1 Test site environment
Test site environmental requirements shall be as specified in the EQUIPMENT standard, If limit values of less than 70 tA r.m.s. or 100 jiA peak are specified, or if the EQUIPMENT contains large shields which may be driven by high-frequency signals, product committees shall refer to Annex B.AS IEC-60990 pdf download.