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Topic Title: Earthing Conductor Installation / High Zs
Topic Summary:
Created On: 21 January 2019 08:53 am
Status: Read Only
Linear : Threading : Single : Branch
 Earthing Conductor Installation / High Zs   - PWatts - 21 January 2019 08:53 am  
 Earthing Conductor Installation / High Zs   - AJJewsbury - 21 January 2019 12:20 pm  
 Earthing Conductor Installation / High Zs   - gkenyon - 21 January 2019 01:56 pm  
 Earthing Conductor Installation / High Zs   - chrispearson - 21 January 2019 01:59 pm  
 Earthing Conductor Installation / High Zs   - OMS - 21 January 2019 02:35 pm  
 Earthing Conductor Installation / High Zs   - PWatts - 21 January 2019 03:56 pm  
 Earthing Conductor Installation / High Zs   - Alcomax - 21 January 2019 04:21 pm  
 Earthing Conductor Installation / High Zs   - PWatts - 21 January 2019 04:24 pm  
 Earthing Conductor Installation / High Zs   - Alcomax - 21 January 2019 05:37 pm  
 Earthing Conductor Installation / High Zs   - chrispearson - 22 January 2019 09:48 am  
 Earthing Conductor Installation / High Zs   - AJJewsbury - 22 January 2019 11:01 am  
 Earthing Conductor Installation / High Zs   - mapj1 - 22 January 2019 11:06 am  
 Earthing Conductor Installation / High Zs   - John Peckham - 22 January 2019 11:06 am  
 Earthing Conductor Installation / High Zs   - PWatts - 22 January 2019 04:21 pm  
 Earthing Conductor Installation / High Zs   - mapj1 - 22 January 2019 04:27 pm  
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 21 January 2019 01:59 pm
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chrispearson

Posts: 1095
Joined: 15 February 2018

Presumably the Zs is the same on all three phases, so it must be the earth part of the loop which is below spec.

According to Prysmian's data, the resistance of the armour (at 20 deg C) is 0.04 Ohms for the 95 sqmm cable and 0.08 Ohms for the 185 sqmm, so it is difficult to see how a target of 0.121 Ohms could ever have been met.

Can you test Zs at the joint? That would at least narrow down the section of cable which needs to be fixed, or even the joint itself.
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