Isolating for Insulation Resistance

[Fender]

Hi all, is it sufficient to turn off the switch to the boiler when doing an IR test? I thought only double pole switches would isolate both phase and neutral and a boiler ran off a fused spur isn't double pole? Dimmer switches you disconnect and join phase and neutral, do you do this at the fused spur when isolating the boiler.

 

[truckster]

Most modern fcu's are double pole switched some of the older ones may not be

 

[Fender]

How do you tell a double pole swich?

 

[telectrix]

ohm meter across the 2 N termilnals, see if it switches ( with fcu isolated, of course )

 

[Fender]

Of course, wasnt such a daft question after all!

 

[Fender]

So i could use a voltage indicator to tesyt dead then?

 

[Knobhead]

Where are you? I’ll look up local undertakers.
Honestly if you can’t isolate to make yourself safe you shouldn’t be let loose!

 

[Fender]

hi Tony, just thought about last post and get your point! Dead test, system would be isolated so wouldnt have a voltage.

 

[Knobhead]

I give up!

 

[i=p/u]

as im led to believe, you just have to open the switches you think vunrable, dont do much testing yet

 

[Fender]

Tony, would you care to elaborate please.

 

[Knobhead]

If I must.

Personal isolations are your responsibility.

 

[ezzzekiel]

when were approved voltage indicators banned

 

[Fender]

safe isolation would have been done. My question was before doing an insulation resistance to see if the fused connection unit at a boiler would be isolated ie so when an IR test is done the current wouldnt pass to the boiler damaging the pcb.

 

[Goody]

Simple solution is to disconect the leads from the switch to the boiler in order to save the PCB.