Position of the Main switch debate.

[Tronic]

I have been having a discussion on site recently :

In an industrial situation, in the main intake room which contains the metering equipment, there is a, 60947-3 switch fuse. This feeds a section board complete with MCCB's, which in turn feeds 10 sub boards dotted around the place.

When completing an EIC, for a newly installed circuit, fed from one of the sub boards, whichbl is fed from the section board, which is fed from the switch fuse, which point of isolation are you inclined to put as the "main switch/fuse/rcd" on the test certificate?

I argue it's the switch fuse in the intake room, someone else says the main switch of the DB from which the new circuit originates from.

 

[littlespark]

I put the sub main DB mainswitch. Rightly or wrongly.

I treat it as the main switch of the distribution point of final circuits that I’m working on.

 

[Tronic]

I put the sub main DB mainswitch. Rightly or wrongly.

I treat it as the main switch of the distribution point of final circuits that I’m working on.

A lot of this trade is interpretation mate, it's good to hear others opinions.

On the cert, the section around the "main switch" heading, all the information is relating to the intake position, main earthing/bonding sizes, means of earthing etc. That's how I get to putting the isolator at the main intake position.