Air conditioning unit

[Elliott96]

Im putting a new circuit in tomorrow for an air conditioning unit (im just doing the supply side). Am I right in thinking a standard 30ma rcd and b type breakers can’t be used with air conditioning units?
Tia

 

[Pete999]

Im putting a new circuit in tomorrow for an air conditioning unit (im just doing the supply side). Am I right in thinking a standard 30ma rcd and b type breakers can’t be used with air conditioning units?
Tia

Depends on the size and voltage of the A/C unit Elliott 96, length of run, type of installation method, etc etc too many imponderables to make a snap decision like that.

 

[telectrix]

Why would you want to fit a RCD?

 

[Elliott96]

Depends on the size and voltage of the A/C unit Elliott 96.

Sorry, its 230v and about 32amps

 

[Elliott96]

Why would you want to fit a RCD?

Would you not?

 

[Pete999]

Sorry, its 230v and about 32amps

About 32 Amps? how big is the A/C unit electrically?

 

[James]

I presume an air con company is doing the install.
ask the people supplying and installing it what spec they want for the supply.
if at all possible get them to email the spec to you.
that way if its wrong, you can divert the blame and cost back to them.

 

[telectrix]

what regulation requires a RCD for a A/C unit?

 

[Pete999]

Im putting a new circuit in tomorrow for an air conditioning unit (im just doing the supply side). Am I right in thinking a standard 30ma rcd and b type breakers can’t be used with air conditioning units?
Tia

Think inrush on start up, many time during the working day?

 

[Elliott96]

About 32 Amps? how big is the A/C unit electrically?

https://ampair.co.uk/products/panasonic-cu-5z90tbe/ Customers just sent over this. The run is about 100 meters from consumer unit in basement mainly clipped direct and in trucking up to the roof.

 

[James]

I have had similar issues with compressors where the customer just asks for a 32A isolator fitting.
then calls back urgently to say the compressor guy is here and says the supply isn't big enough etc.

 

[telectrix]

what cable?

 

[Elliott96]

what regulation requires a RCD for a A/C unit?

Surely its better to have it on a rcd than not? I was going to install a sub db anyway as theres no spare ways so can install a main switch and chuck the rcd

 

[TJ Anderson]

Hi Elliott

RCD would not be a requirement of the unit and you can avoid the additional protection requirement by your install method.

Type B is not recommended due to the inductive load of the compressor in condensor unit. They are almost all inverter driven now though so inrush is not generally an issue. C type is more suited to this type of load however and you should design to this.

 

[James]

near the bottom of the page.

suggested fuse 25A
if it were me I think 25A C type is what id be putting in.