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sajeel

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Hi
Just did a three phase consumer unit, tested insulation and continuity before commission tested three phase in correct order. When I switched on it sparked and took out l1 and l2 fuse, incomer has two faulty lock screws at top apart from that any other ideas ?
 
As always instead of advice people just talking nonsense obviously I will check all wiring and test before replacing. incomer but as incomer was used and is rattling inside I will need to replace and carry out further tests.
Guess I am on my own no useful advice !
 
What exactly are you talking about, when you say it was ''Used'' and ''Rattling Inside''??

I think most people here, have been thinking you were talking about a cable when you stated ''Incomer'', but your not are you!!
 
Thanks to all who responded productively, the supply is 3 phase 420v fused by two 100a and one 60a this is fed Into ryefield board 5 way which is feeding shop and 2 flats by of 5 60a fuses. See pictures attached. This is then fed using armoured cable to db. Have done continuity tests live phases to earth and neutral no fault found. Insulation resistance is 675m ohm and passes fine. When I fit l1 fuse in ryefield db works fine, however if I fit l2 fuse and test it blows fuse l1 and l2 but the flats are unaffected as they are fed direct off supply. Any productive help will be appreciated. By the way phases are correct and even if they would not that should not blow fuse on ryefield.
 

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