Does anyone actually use single pole isolation main switches in single phase TN-S or TN-C-S installations, (or just line switching in three phase installations) where main bonding is correctly installed?
Think of the cost saving? 461.2.
Z.
I think that you would be hard pressed to find a SP main switch, but perhaps you are thinking of older installations and EICRs? In any event, main switches are cheap as chips, so not much of a cost saving.
We may need SPSN main switches, but we seem to be happy with SP switching for the circuits.
So with a three phase installation, the use of this 4 pole switch may cause problems if the N opens fractionally before the three lines upon turning off.
https://www.ebay.co.uk/itm/173003722235?epid=28010512496&hash=item2847d34dfb:g:zeYAAOSwj99aHWFm
Z.
So with a three phase installation, the use of this 4 pole switch may cause problems if the N opens fractionally before the three lines upon turning off.
https://www.ebay.co.uk/itm/173003722235?epid=28010512496&hash=item2847d34dfb:g:zeYAAOSwj99aHWFm
Z.
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