In line switch for workbench ring

[EastCoastPete]

Hello to all,
I've been asked by a customer to install an intermediate ( between 32a RCBO and first socket) switch so he can easily shut off all his workbench circuits at night. I've been looking for a 4 pole NC switch with a cover but I guess in the wrong place so far.
Any suggestions please?
Thanks

 

[Spoon]

Welcome to the forum mate.
How about a contactor activated my a key switch?

 

[snowhead]

Why N/C and why 32amp;

https://www.electricalcounter.co.uk...+Isolator+4+Pole+20A+AC+IP65+Rated/2476434528

But if you did want 32amp;

https://www.electricalcounter.co.uk...+Isolator+4+Pole+32A+AC+IP65+Rated/2586458227

 

[mhar]

Radial or Ring Circuit?
Edit, just read the title!!

 

[westward10]

I personally would not connect a ring final across a four pole switch/contactor due to the possibility of failure to one of the poles. I would change it so a 32A radial is taken to the switch then connect the ring final.

 

[Spoon]

I personally would not connect a ring final across a four pole switch/contactor due to the possibility of failure to one of the poles. I would change it so a 32A radial is taken to the switch then connect the ring final.

I was thinking of a 'forced guided' contactor.
Also a key switch so that only the person with the key can turn off the circuit.

 

[westward10]

I don't see how a force guided contactor would help, a four pole one normally has two n/c and two n/o poles.

 

[Spoon]

I don't see how a force guided contactor would help, a four pole one normally has two n/c and two n/o poles.

If one of the contacts get stuck then they all will. As in your suggestion, you can still get a contact stuck and the other working, without one. It's a safer option.

 

[westward10]

But a four pole has opposing contacts, two n/o and two n/c doesn't it or am I getting this totally wrong.

 

[Pete999]

But a four pole has opposing contacts, two n/o and two n/c doesn't it or am I getting this totally wrong.

Don't think so Mate

 

[Spoon]

But a four pole has opposing contacts, two n/o and two n/c doesn't it or am I getting this totally wrong.

The OP will have to look for a forced guided contactor that has 4 normally open contacts. Doesn't necessarily have to be '4 pole' could be '6 pole', as long as it has 4 normally open contacts.
Or he could go along your suggestion, then he only needs one that has 2 normally open contacts.
I just mentioned a 'forced guided' contactor mate.

 

[Richard Burns]

I would go with snowhead's suggestion, but you can also get four pole isolator switches, as main db type switches, that, since you mention a cover, you could put one in a 4 module enclosure.

 

[GBDamo]

What is the users intention?

Does he want to be able to clunk everything off under load as he leaves?

or..

Does he want to power everything down in a controlled and orderly manner before isolating the power to the circuit as a precaution?

 

[Spoon]

Really need input from the OP as to what the customer requires on this. We have given him 3 options.

 

[EastCoastPete]

Hello, Spoon/Snowhead and all,thanks for all the input and welcome. I'd a bit more reading and a call to make..Yes, 'clunk off' is the deal. the guy is shutting up a big building each night, the benches have mebbe battery chargers, heaters and solders left on.
I looked at the rotary isolator which is the right kind of positive use design but not under load. Was thinking NC but that's relevant for emegency switch I think. This is a daily use device.
Thanks