Single pole rotary isolator

[Tommydeek]

Hi everyone,

I have moved into a property with a 63a single pole rotary isolator controling a inline water heater. Is this safe? Surely it should be a 63a two pole isolator switching both the live and neutral?

Any advice would be much appreciated.

Thanks.

 

[LukeD]

If you look up the part code it actually does appear to be a single pole switch disconnector.

https://uk.farnell.com/eaton-moeller/t5b-1-8200-a-svb/isolator-flush-63a-1pole/dp/3203270

It looks like they just "add" in another screw terminal for the double pole version !

 

[Lucien Nunes]

The way I read 464.1 and 461.2 I'd say, if a TNCS or TNS supply, the requirement is only for single pole isolation.

It's an interesting point; from the point of view of final circuits controlled by a DP main switch or RCD in the CU, does the presence of a switching pole in the neutral negate the 'reliably connected to earth' that would otherwise be implied by the ESQCR? (Such DP switch being required by 462.1.201).

 

[Tommydeek]

So from what I gather the single pole isolator is adequate however, a double pole isolator would be the preferred option but not necessary.