Isolation before removing cu cover? | on ElectriciansForums

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Davey1988

Im currently taking my nvq lvl 3 and I isolated individual circuit and remove cover and prove unit and circuit which i isolated was dead. but only isolated one circuit. Does the whole installation need to be isolated to remove the cu cover (3 phase 400v), as the other tradesmen was using other circuits hence reason why i didnt (but tbh i didnt really need to isolate anything else for the work that i was carrying out)

im competent to know what im doing, only asking if theirs a regulation or safety matter to consider for photos for evidence for my nvq. Cheers.
 

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