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  1. T

    30mA RCD main switch

    Does RCD also cover Kitchen? If so your problem is sure to be Fridge especially if tripping is intermittent.
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    cooker control unit

    Rad onsite guide appendix 8.7 onwards. Also remember Manufacures instructions override BS7671Pray
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    ruunning cables behind a shower (in boxing in)

    Yes but all wiring regs will comply I.E 17th . RCD will be required for additional protectiion on circuit .
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    immersion testing.

    Simple test , Step 1 Ensure thermal cutout has not popped out . If so push back in and turn immersion back on. Step 2, If thermal cutout Ok then do simple continuety test as follows, On probe set thermostat to lowest temperature and with tester across both points should have open reading. Then...
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    Zs live Testing - does everyone do it?

    Yes always important to do Zs . Either way can be calculated using Zs= Ze + {R1+R2} or by measurement. Remember though Zs soft test if RCD attached.Though best done by calculation .
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