how to shut off this 3 phase supply?

[bluesky]

this is a 3 phase supply in a shop, how to shut off the power? looks there is a radio teleswitch there.

 

[pennywise]

How would you isolate a single phase supply.

 

[bluesky]

hi, for single supply, there is normally an isolator, but cannot find isolator for this one. also there is fire alarm circuit on the board, is it ok to shut the whole board off? if not how can i do the periodic inspection report?

 

[pennywise]

Is this for your Ze test? and you've got to do it within working hours.

 

[bluesky]

not only for ze, i am thinking to do dead test first, in 2391 i think i did shut off the whole power and then test continuity and insulation for each circuit, so for this three phase board if i cannot isolate the supply, how can i do the dead test?

 

[pennywise]

On a new install yes, but an existing just isolate the circuits one by one as you test them. Though test for back feeds on the circuit you've just isolated to do your dead tests on just in case. For the Ze just try and do it at their least busiest hour, as for isolation do as any single phase install turn off the main isolator to the DB then disconnect the main earth or link, do the Ze pop it all back together turn on 5 min at most, the fire alarm turn to engineering mode or silence it, it may just register power failure. Sure someone will give you a better way, just been out to the pub so I excuse myself as i'm not fit to work

 

[bluesky]

hi pennywise, see you mean, thanks for trying to help even just leaving pub

 

[leccy]

we have had a similar problem in past, leave the board live. you can do ze and pfc, then isolate board to dead test

 

[kayeno]

If you do manage to find any cut out fuses or anything, do remember to remove/ isolate any load from the circuits first

 

[pevvers]

you can do ze

Not without isolating the supply, as the earthing conductor needs to be removed...

 

[SEC-Tom]

Not without isolating the supply, as the earthing conductor needs to be removed...

Just do it quickly.

I assume he meant Zs...

 

[m25maintenance]

leccy do u do ze on live board, ummmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm, so when u pop d earth conductor off, u leave the whole installation unsafe