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Discuss swa feeding ring main 1 leg in the Electrical Forum area at ElectriciansForums.net

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davetherave1979

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Hi all have a job to quote to sort out kitchen is wired in a radial circuit spured of a ring spur of a spur can acess the 2 legs in a loft abov ekitchen but the only way back to the board is outside was going to clip 1 swa 10mm 3 core along wall back to board with 32 rcbo and conect both legs of the ring to this 1 cable. Any 1 see any problems with this or would I be better running 2 separet swa's. thanks
 

Richard Burns

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Better for testing purposes to run two cables to maintain the ring structure back to the CU.
Lollipop rings are potentially within the regs but do cause difficulties.
 
We use lollipop rings quite a bit out here Rich for IT offices.

My preferred choice of weapon for an office is power track, but you need a floating floor for that. So where we can't use it I run a 6mm from the CU which can be 30/40 metres into an adaptable and then ring out from there.

This is just because of adhering to protective conductor currents and the appropriate regs, which it does conform to and can also be quite cost effective in both labour and materials
 

Richard Burns

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We use lollipop rings quite a bit out here Rich for IT offices.

My preferred choice of weapon for an office is power track, but you need a floating floor for that. So where we can't use it I run a 6mm from the CU which can be 30/40 metres into an adaptable and then ring out from there.

This is just because of adhering to protective conductor currents and the appropriate regs, which it does conform to and can also be quite cost effective in both labour and materials
Do you not find it a nightmare to test the ring effectively as you would have to test the single cable R1 and R2 and then test the ring with figure 8 test and join the results, which seems tedious. Also if the change from one to two cables is not accessible or obvious then the next electrician could find things difficult.

However I do take your point about labour and materials.
 
Totally agree Rich................. I do the r1 rn and r2 to make sure the ring part complies, but I do a combined R1 and R2 for both parts so it's not that much more testing to be honest.
 
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sedgy34

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surely you can make it/change it to a 4mm radial?
 
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davetherave1979

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exsisting ring is 2.5 te so wont be able to change it all just need to run 2 cables back to the board to make it a ring will be using 2 swa cables now so thanks guys
 

topquark

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Why 10mm SWA? Isn't that overkill for what you describe (1 x RFC). 3c x 4mm s/b perfectly adequate unless I've missed something.
 

telectrix

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armour.
 
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sedgy34

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as tel (the patient) says 4core 2.5 jobs a goodun
 
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