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Compliant?

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Is this arrangement compliant or not?


Consumer unit. R.C.D. protected shower circuit supplied by a B40 M.C.B. which runs to a cord ceiling switch  in the shower room in 6.0mm2 T&E. Old electric shower removed. New power shower installed with water supplied from tanks. 0.63 Amp transformer in loft to feed new integral shower pump motor. Loft transformer fed via 3 Amp fused switched fused connection unit on a 1.0mm2 T&E cable from old shower ceiling cord switch. 1.0 mm2 T&E run 2.5 metres.


P.S. The switched fused connection unit is at the end of the supply cables.


Confirmation or condemnation by regs. please.


Z.
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  • 0

    15m of 6mm2, surely?



    I was working on the basis that 1mm² T&E (with a 1mm² c.p.c.) would have a resistance of 36.2mΩ/m - so 90.5mΩ for 2.5m. 6mm² with a 2.5mm² c.p.c has a resistance of 10.49mΩ/m - so you need about 8.6m worth to have the same increase in Zs. (All resistance figures at 20°C but the proportions will be the same at other temperatures.)


    If 6mm² T&E had a full sized c.p.c. then yes it would be closer to 14.7m.


      - Andy.
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  • 0

    15m of 6mm2, surely?



    I was working on the basis that 1mm² T&E (with a 1mm² c.p.c.) would have a resistance of 36.2mΩ/m - so 90.5mΩ for 2.5m. 6mm² with a 2.5mm² c.p.c has a resistance of 10.49mΩ/m - so you need about 8.6m worth to have the same increase in Zs. (All resistance figures at 20°C but the proportions will be the same at other temperatures.)


    If 6mm² T&E had a full sized c.p.c. then yes it would be closer to 14.7m.


      - Andy.
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