Cable Gland and Plug Application on I.S Application

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Jasoncha Participant Join Date: Oct 2013 Posts: 1	Cable Gland and Plug Application on I.S Application 10/08/2013 2:17 AM
	Some of Intrinsic safety Field Instruments especially Package unit are equipped with general purpose gland and/or normal Plug into any entry hole. In this case, I would like to know if this is acceptable or not. If YES, please kindly advise any justification according to Code or Standard… The following is my understanding… --->Any explosion proof ( Exd, Exe , I.S certified gland) is NOT required, and just Weather proof gland is enough due to below NEC explanation…?? 1) According to NEC 504.10 ' (B) Location ' clause, General purpose enclosures shall be permitted for intrinsically safe apparatus.. --> which means any attached accessory like cable gland or plug can be also General purpose… my understanding is correct ? 2) NEC 504.70 Sealing shows that " …… such seals shall not be required to be explosion proof or flameproof. " ---> even though this seal does not address thread requirement to meet explosion proof, it could be understood that threaded fitting also do not need any certificate… my understanding is correct ? If the above my understanding is NOT correct, then Please kindly let me know any other more clear definition for application of fitting for I.S apparatus according to any code or standard…
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Iris Guru Join Date: Jul 2010 Posts: 669 Good Answers: 176	#1 Re: Cable Gland and Plug Application on I.S Application 10/08/2013 8:58 PM
	In the concept of intrinsic safety, certain components are considered to be simple apparatus because they are passive components, for example switches, junction boxes, resistors, cable glands. Junction boxes used exclusively for I/S circuits have to have minimum ingress protection of (IP20) or for weather (IP54) but do not have to be explosion proof by any standard, unless the 'owner' has a site specification for such. Hence cable glands just have to be IP compatible rated for the enclosure, but not I/S certified. IEC 60079-14 covers I/S electrical installations. 12.2.6 covers cable glands
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#2 Re: Cable Gland and Plug Application on I.S Application 10/09/2013 3:38 AM
	It is not possible to apply the concept of intrinsic safety to cable glands; any attempt to do so is complete nonsense. The question indicates a shortfall in training on the use of electrical equipment in hazardous atmospheres, which requires correction at the earliest opportunity, and before the end Client finds out. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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