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Discuss stripping twin and earth in the Electrical Tools and Products area at ElectriciansForums.net

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wayne

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anyone know of a tool for stripping twin and earth? apprentices are forever telling me your not supposed to pull the earth (what do they know) and i hate running the knife down it especially when im doing a db
 
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Cirrus

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  • #2
not to my knowledge. Like you, I snip and then pull on the cpc (unless 10mm and then I pull on the neutral so as to not unravel the stranded cpc)
 
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EasyFox

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  • #3
not to my knowledge. Like you, I snip and then pull on the cpc (unless 10mm and then I pull on the neutral so as to not unravel the stranded cpc)
Same as that :D
 
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Grae79

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  • #4
stan lee's knife..personally prefer it....do occasionally cheese wire T & E tho...
 
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DadofTwo

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  • #5
Mee too - it's the only way to do it unless you wanna risk slicing your hand to pieces (while also risking cutting the insulation on the conductors).

Apparently they're taught that pulling the cpc can cause a break somewhere further down the cable! What poo that is! OK, so there's the potential to weaken the cpc but only at the point whre it was ulled. Besides, once installation is complete, testing should identify any broken cpc faults anyway.

It's like the whole twisting cpc's thing. Personally I don't. Not because it could break the cpc but simply because I can't be bothered so while current guidleines state it's not good practice I won't bother. On the flip side, while current guidelines state it could damage the cpc, if it ain't twisted then there's more of a chance of a cpc slipping out of a terminal after testing thus breaking the earth circuit which could go undetected until it's too late.
 
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Cirrus

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  • #6
but as long as you double the ends of the cpc over it won't slip out of the terminal
 
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DadofTwo

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  • #7
but as long as you double the ends of the cpc over it won't slip out of the terminal
True, unless the terminal ain't tightened properly. Basically, if twisted together then the cpc retains it's continuity even if the terminal isn't tightened and it's therefore only the accessory and/or backbox that is potentially unearthed.
 
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DanBrown

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  • #8
Hi Guys,
I am actually an apprentice and i was always led to believe, that when you pull on the CPC of the cable, it can in-fact slightly stretch the CPC, that as you probably know will increase the resistance and cause the earth to be slightly downgraded. As you say tho, test results should tell you if it still passes or not in regards to earth-loop.
 
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gazzel72

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  • #9
By far the easist way to strip T&E is to use the c.p.c. As to this method stretching the cable & reducing the resistance, it will have very little/no measurable effect on value measued. The cable is manufactued by extrusion, so stripping in this way is very unlikely to break the cpc, and of course must be tested.
 
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