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Topic Title: Extending earth bonding
Topic Summary:
Created On: 19 April 2017 01:04 PM
Status: Read Only
Linear : Threading : Single : Branch
 Extending earth bonding   - goldenboy1818 - 19 April 2017 01:04 PM  
 Extending earth bonding   - dustydazzler - 19 April 2017 01:32 PM  
 Extending earth bonding   - geoffsd - 19 April 2017 01:41 PM  
 Extending earth bonding   - weirdbeard - 20 April 2017 06:53 PM  
 Extending earth bonding   - mapj1 - 19 April 2017 02:08 PM  
 Extending earth bonding   - John Peckham - 19 April 2017 04:41 PM  
 Extending earth bonding   - geoffsd - 19 April 2017 05:03 PM  
 Extending earth bonding   - geoffsd - 19 April 2017 06:52 PM  
 Extending earth bonding   - mapj1 - 20 April 2017 12:25 AM  
 Extending earth bonding   - geoffsd - 20 April 2017 01:04 AM  
 Extending earth bonding   - spinlondon - 19 April 2017 09:22 PM  
 Extending earth bonding   - AJJewsbury - 19 April 2017 10:11 PM  
 Extending earth bonding   - mapj1 - 20 April 2017 01:38 AM  
 Extending earth bonding   - geoffsd - 20 April 2017 05:17 PM  
 Extending earth bonding   - geoffsd - 20 April 2017 07:07 PM  
 Extending earth bonding   - weirdbeard - 20 April 2017 07:22 PM  
 Extending earth bonding   - geoffsd - 20 April 2017 07:28 PM  
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 20 April 2017 01:04 AM
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geoffsd

Posts: 2342
Joined: 15 June 2010

Originally posted by: mapj1

Note of course that for buildings on PME supplies
(link)

The link states what, at present, is considered the lesser risk as we are required to bond extraneous-conductive-parts and not cater for lost neutrals.

actually recommends such an insulating break for both gas pipes coming in on page 16, and outside taps going out on page 28.

A good idea, but the bonding instructions, in 7430 and 544, if followed, leave the extraneous-conductive-part unbonded and the interior pipe, which is not an e-c-p, possibly unnecessarily earthed - that is earthed, not bonded.

I can't help wondering if in such cases, ditching the pretence of equipotential bonding to the stuff outdoors altogether, and just calling it earthing of the indoor piping, might be better.

Why is it a pretence? The indoor piping does not need earthing.

That is a different argument and an instruction to do that would be to earth possibly isolated parts, which do not require it, introducing hazards which were not present before - as the proverbial door knob.
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