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mohsinhamid
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Join Date: May 2011
Posts: 91

Earthing DC Cable in One End?

07/14/2012 1:09 AM

I have recently terminated 1c*300sq.mm armoured copper cable for DC supply, I was told to gland in one end and to connect to the terminal directly through lug without glanding at another end. Do circulating current flows in DC cable too....??? pls any one clarify me......
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Crabtree
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Join Date: Jul 2007
Location: Commissariat de Police, Nouvions, occupied France, 1942.
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#1

Re: Earthing DC Cable in One End?

07/17/2012 2:31 PM

Think about it, Bwana. If the cable is connected at only one end then how on earth is a circulating current supposed to flow in it?

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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
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#2

Re: Earthing DC Cable in One End?

07/29/2012 10:12 AM

No need! Only Single Core Armoured Cables while carrying AC currents tend to induce emf in the armour which when bonded at both ends to earth would result in circulating currents in the armour.

This phenomenon is unheard of in DC current carrying cables.

The instruction to earth the gland at one end only must be more out of convention rather than any technical reasoning.
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