2 What is an fault arc - Die BG ETEM
2 What is an fault arc - Die BG ETEM
2 What is an fault arc - Die BG ETEM
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22<br />
6 Textile material <strong>an</strong>d protective clothing<br />
6.1 Arc thermal protection requirements – IEC 61482-2<br />
Electric <strong>fault</strong> <strong>arc</strong>s are of general r<strong>is</strong>k for workers. An electric <strong>fault</strong> <strong>arc</strong> c<strong>an</strong> particularly<br />
occur in case of electrotechnical work at or near to live parts. Protective clothing<br />
according to IEC 61482-2 [5] reduces the thermal <strong>arc</strong> hazards of electric <strong>fault</strong> <strong>arc</strong>s<br />
<strong>an</strong>d contributes to the protection of workers against these r<strong>is</strong>ks.<br />
The product st<strong>an</strong>dard IEC 61482-2 specifies requirements <strong>an</strong>d test methods applicable<br />
to materials <strong>an</strong>d garments for protective clothing for electrical workers against<br />
the thermal hazards of <strong>an</strong> electric <strong>arc</strong> based on<br />
• relev<strong>an</strong>t general properties of the textiles, tested with selected textile test<br />
methods, <strong>an</strong>d<br />
• <strong>arc</strong> thermal res<strong>is</strong>t<strong>an</strong>ce properties, such as<br />
- the <strong>arc</strong> rating of materials according to IEC 61482-1-1, or<br />
- the <strong>arc</strong> flash protection class of materials <strong>an</strong>d garments (Class 1 or Class 2)<br />
according to IEC 61482-1-2.<br />
Requirements do not address electric shock hazards, the present st<strong>an</strong>dard <strong>is</strong> applicable<br />
in combination with st<strong>an</strong>dards covering such hazards. The st<strong>an</strong>dard does not<br />
contain requirements for the protection of head, h<strong>an</strong>ds <strong>an</strong>d feet.<br />
Textile material <strong>an</strong>d clothing according to the product st<strong>an</strong>dard IEC 61482-2 <strong>is</strong><br />
tested by using a real electric <strong>arc</strong> as sources of thermal effects. The hot plasma<br />
<strong>an</strong>d gases in <strong>an</strong>d around the <strong>arc</strong> column are the source of the heat flux <strong>an</strong>d, consequently,<br />
the thermal effects. Details about heat tr<strong>an</strong>sfer <strong>an</strong>d test set-up according<br />
to IEC 61482-1-1 <strong>an</strong>d IEC 61482-1-2 are given in chapter 5.<br />
The st<strong>an</strong>dard IEC 61482-2 covers protective clothing against thermal <strong>arc</strong> hazards in<br />
general, not for a limited voltage level or r<strong>an</strong>ge only, although the test methods use<br />
set-ups with a defined test voltage. The mode <strong>an</strong>d violence of heat tr<strong>an</strong>sfer <strong>is</strong> only<br />
less specific for <strong>arc</strong>s burning in a LV circuit or in a MV <strong>an</strong>d HV one. Electric power<br />
<strong>an</strong>d <strong>arc</strong> duration are the primary influencing parameters <strong>an</strong>d characterize the thermal<br />
source. Clothing withst<strong>an</strong>ding the incident energy levels of the tests will have the<br />
according <strong>arc</strong> thermal protection effect in a LV or a MV/HV installation as well.
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