20 Amp DP switches

[Amp David]

A 20 amp DP switch is rated to switch a max load of 20 amps right?

Being told this afternoon that they can only be installed on a circuit that is fused at <=20 amps.:whatchutalkingabout

 

[johnboy6083]

im in agreement with you amp. ive used them in the birds mums house instead of a fused spur, to isloate the washing machine, and dishwasher. a standard domestic socket is only rated to 13A per outlet, yet they are often installed on a 32A MCB.

 

[telectrix]

disagree. the 20A switch's load is limited to what you connect to it. obviously, you would not connect a load exceeding 20A.

 

[mayfair]

20A is 20A simples

 

[telectrix]

so expanding on that. an 80A Main Switch in a CU protected by a DNO 100A fuse is a no no then?

 

[Mark_Burgess]

disagree. the 20A switch's load is limited to what you connect to it. obviously, you would not connect a load exceeding 20A.

Same as ^^^^^^^

 

[Amp David]

So connecting one to a circuit protected by a 30/32 amp fuse or breaker is not allowed even if used as a switch for a single socket ?

 

[DNS1]

Surely as long as a load of less than 20A is drawn through that switch, it doesn't matter what the MCB is rated at?

If you were using it as an isolator for a single 13 amp socket for example, you'd be fine IMO.

I've got a 20A DP in my kitchen which isolates the 13A socket for the washing machine under the counter. Doesn't make any sense that this wouldn't be compliant.

 

[IQ Electrical]

So connecting one to a circuit protected by a 30/32 amp fuse or breaker is not allowed even if used as a switch for a single socket ?

The units are to BS1363, exactly the same as a twin or single 13A socket outlet.

The switching is rated at 20 Amps.

 

[JUD]

There was a bit of a debate about this very subject not long ago in another thread....
http://www.electriciansforums.net/electrical-forum-general-electrical-forum/38029-grid-wiring-kitchen-ring.html

My argument was that if you're feeding a socket outlet that's going to have something plugged in then the plug top will be fused.

Therefore, having a fused spur aswell would be pointless and would lead to discrimination issues as you'd have 2 fuses in series.

I see no point in fusing a 20A switch which is never going to be handling more than 13A.

 

[Amp David]

Thank IQ, as I thought the max switching is the rating.I am happy again now

 

[Des 56]

I would say the 20 amp double pole switch "contacts" are rated for switching 20 amps, but the terminals would be 32 amp rated

 

[Amp David]

Cheers people.