rotary switch wiring

[J.C.E]

Hi guys

Got a swa run to do tomorrow- just the supply for a AC unit

its a single phase 3 core 4mm supply going to a rotary isolator (this is what I am installing)

then another company will be connecting a AC unit from the isolator at a later date

I haven't actually had to install a rotary isolator before!

Its 20a 4pole switch

my question is where do I terminate my neutral?

I guessing my live can go into supply side 1 (or 2 or 3- as only single phase)
but the 4th 'pole' has a switch symbol sticker on it inside the isolator

does my neutral go into the remaining 1,2, or 3 or this forth 'switched' pole?

I know its meant to isolate the line and neutral (double pole)

but I am bit confused as to where my neutral should go...

look forward to your replies

 

[Bobster]

4th switched pole.

Normally these isolators are set for 3ph and N so the 4th pole will be late break early make.

 

[J.C.E]

Was going to link out in 4mm across the 3 poles too

 

[Bobster]

Why?..

 

[J.C.E]

saw someone mentioned it on a post i searched on here yesturday...guess it just balances the load across the 3 poles

 

[Bobster]

No need

 

[Darkwood]

Usually the 4th pole is marked with a big N, if not there is usually a little piece of paper that shows the correct method but like above just pick one of the 3 poles for L and used the 4th pole with the switching symbol as your N.

 

[J.C.E]

Cpc and n markings are above the the 2 'crappy' little terminals on the plastic casing of the switch (so wouldnt be isolated when switched off)

 

[Darkwood]

saw someone mentioned it on a post i searched on here yesturday...guess it just balances the load across the 3 poles

Your mixing your self up, it may be required to loop a single phase supply through a 3pole contactor if the overload is a 3ph one as it may be sensitive to phase failure thus you run the single phase through all the poles to ensure the overload works correctly for your single phase motor. Some do it by habit to give redundancy on the switching in case of switch failure then you have another contact point to hopefully operate correctly.

 

[Andy78]

I get the feeling it would have been simpler to have bought a DP rotary isolator :wink_smile:

 

[J.C.E]

I get the feeling it would have been simpler to have bought a DP rotary isolator :wink_smile:

Ordred by supervisor- im just the chimp doing it

pretty sure it is dp if its four pole smart ---..

 

[Leesparkykent]

Ordred by supervisor- im just the chimp doing it

pretty sure it is dp if its four pole smart ---..

Or Triple pole & Neutral :leaving: