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Discuss shower circuit 6ml or 10ml in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

S

Scott F

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client has old shower he wants replacing with 9 maybe 10kw.He has 6ml cable under floorboards which will be covered by 40 amp rcbo >now this is the part im struggling with according to table 4d5 ref meth c rating is 47 amps but if the cable runs under the floor with other cables does this make it ref meth 100* in which case it woukld be 34amps so would need either upgrading to 10ml or lowerd output on the shower hope this makes sense
 
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ian.settle1

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client has old shower he wants replacing with 9 maybe 10kw.He has 6ml cable under floorboards which will be covered by 40 amp rcbo >now this is the part im struggling with according to table 4d5 ref meth c rating is 47 amps but if the cable runs under the floor with other cables does this make it ref meth 100* in which case it woukld be 34amps so would need either upgrading to 10ml or lowerd output on the shower hope this makes sense
Replace it with a 10mm as 10Kw is 43amps.
 
K

KillerWatt

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As above, replace it with 10mm² as 6mm² will only be good for up to 7KW when it is enclosed.
As far as protection goes, use a 40A RCBO for 9KW and a 45A RCBO if going up to 10KW.
 
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