Removing RCD from circuit

[r.bartlett]

Hi guy's

had a tricky one today at a house. We have fitted 2 x inverter air conditioning systems.

The sparks fitted a consumer unit and two 32a c/b with a 30ma rcd. Running 6mm SWA to the outdoor isolators.

However when we switched on the c/b one worked but one tripped the RCD. I spoke to the manufacturer who said "We do not recommend RCD's for inverter systems as they leak down the neutral and trip."

We know it's the outdoor unit which is causing the trip by isolating the mains and interconnect etc. However the trip is instant as the RCD won't hold..

So the sparks was very worried and not at all happy about removing the RCD from the C/U and fitting a std switch. But without the swap the second one won't run

How would you arrange the supply to satisfy the regs and the air con ?

Cheers

Richard

 

[JohnD]

hard wired, no socket = cannot reasonably be expected to supply portable equipment used outside

main bond the services at their point of entry into the building as they are liable to introduce a potential

Have I got it right?

 

[700mb]

remove the rcd and use rcbos insted

 

[JohnD]

remove the rcd and use rcbos insted

wouldn't help (this time).

 

[Albert]

If the circuit was tested and the Zs is low enough, you can use RCD type C or even D, this might solve the problem and yet keep the user safe...
RCBO type B may be will not solve the problem but if the one that trips will have a type C or D RCBO it might help (again in the condition that Zs is low enough).

 

[JohnD]

types C or D RCBOs have a slower curve for over-current trip (the MCB part) but the RCD trip is unaffected.

so that won't help.

My point is that if it's hard wired, it doesn't require RCD protection.

 

[Albert]

types C or D RCBOs have a slower curve for over-current trip (the MCB part) but the RCD trip is unaffected.
so that won't help.

You are right, and this means that I am too tiered and I am going to bed... good night