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

 

[snowhead]

Whatever switch you use is going to fail if it's switching inductive loads daily.

Maybe one of these might be suitable;

 

[EastCoastPete]

Nice! I'll get that strapped to wall in the shower..

 

[davesparks]

If things like soldering irons are left on and only turned off by this master switch then they will be turned back on again by it. So you still end up with things being left on and unattended

 

[Spoon]

Sounds like more common sense or training of the people using the equipment is needed, rather than a switch..

 

[EastCoastPete]

Yes, to all of that, I think the guy is a bit overwhelmed in a new place and the sensible options will prevail. I've some spurs and lighting to do and time to see how it develops.
Thanks for the help.