Bought new shower unit - 8.5KW. Cable already fitted is 6mm2, loosley fitted in brickwork and floor boards to the consumer unit. Estimate 13m length. Now, according to shower fitting instructions, loose-fitted 6mm2 (not conduit/enclosed/insulated wall) ok for up to 40A. But, strictly speaking, am I forced to upgrade to 10mm2?
40A seems a safe value - According to the wiring regs it's 47A for 6mm² embedded in non-insulating building materials. But if you can easily replace it with 10mm², I'd advise that, then you can take the shower back and get a decent one.
40A seems a safe value - According to the wiring regs it's 47A for 6mm² embedded in non-insulating building materials. But if you can easily replace it with 10mm², I'd advise that, then you can take the shower back and get a decent one. to continue... as well as removing the existing 6mm cable and installing a decent power shower that don't work on the lectric (excluding immersion heaters of course).
How do you know that he doesn't have either a combi, or too many people to shower from stored hot water?
I was referring to this table Standard Shower Rating Watts (kW) Maximum load from the supply A Maximum size of Protective device Recommended Minimum Cable Size to be Used Recommended Protective Device 6000 (6kW) 26 32A 6mm2 RCBO 6500 (6.5kW) 28.2 32A 6mm2 RCBO 7000 (7kW) 30.4 32A 6mm2 RCBO 7500 (7.5kW) 32.6 40A 10mm2 RCBO 8000 (8kW) 34.7 40A 10mm2 RCBO 8500 (8.5kW) 36.95 40A 10mm2 RCBO 9000 (9kW) 39.13 40A 10mm2 RCBO 9500 (9.5kW) 41.3 45A 10mm2 RCBO 10,000 (10kW) 43.47 45A 10mm2 RCBO 10,500 (10.5kW) 45.65 50A 16mm2 RCBO 11,000 (11.0kW) 47.82 50A 16mm2 All data in this table has been compiled with reference to BS7671: 2001. The IEE Wiring Regulat Cable Data taken from Table 4D2A. Page 222.
like to see someone teminate some 16mm in a shower pull cord switch :^O hard enough getting 10mm in the deep pattress box
I was referring to this table Standard Shower Rating Watts (kW) Maximum load from the supply A Maximum size of Protective device Recommended Minimum Cable Size to be Used Recommended Protective Device 6000 (6kW) 26 32A 6mm2 RCBO 6500 (6.5kW) 28.2 32A 6mm2 RCBO 7000 (7kW) 30.4 32A 6mm2 RCBO 7500 (7.5kW) 32.6 40A 10mm2 RCBO 8000 (8kW) 34.7 40A 10mm2 RCBO 8500 (8.5kW) 36.95 40A 10mm2 RCBO 9000 (9kW) 39.13 40A 10mm2 RCBO 9500 (9.5kW) 41.3 45A 10mm2 RCBO 10,000 (10kW) 43.47 45A 10mm2 RCBO 10,500 (10.5kW) 45.65 50A 16mm2 RCBO 11,000 (11.0kW) 47.82 50A 16mm2 All data in this table has been compiled with reference to BS7671: 2001. The IEE Wiring Regulat Cable Data taken from Table 4D2A. Page 222. Why does'nt the 11.0 KW need a RCBO but all the others do ?
I believe that 228 is for timber framed buildings 222 is a better default. Wow! :O 400mm T/E! I bet that takes some fittin'?
I believe that 228 is for timber framed buildings 222 is a better default. Wow! :O 400mm T/E! I bet that takes some fittin'? Just trim a few strands off and drill out the ceiling. ps forget about the patress box
Which table is that, Mr Wong? 1) 4D2A is not the data for flat twin & earth cable. 2) If they are using worst case figures from 4D2A (which they seem to be for the 6mm² cut-off point) then they should be recommending 16mm² at 9.5kW, not 10.5....
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