Cable sizing for a shower waste pump

[primetime]

Hi All,

Reading through some online installation instructions for shower waste pumps they dob't specifically state what x section cable to use. If given the following information for example, what would be the minimum sq mm? Thanks.

'230V AC power supply must be provided with a two-pole isolator switch and a dedicated circuit with a 30mA RCD device installed in accordance with the latest revision of the IEE wiring regulations BS7671. It must be wired into a fused, unswitched, fixed wiring connector fitted with a 5amp fuse'

 

[EFLImpudence]

1mm² T&E will be more than adequate. Minimum 0.75mm² flex from FCU to unit.

Having said that, there is a very obscure regulation which states that 1.5mm² is the minimum allowed for power circuits - but no one knows what a 'non-power circuit' is.

 

[Steve]

Don't macerators come with a flex attached?

 

[PrenticeBoyofDerry]

Don't macerators come with a flex attached?

Everyone I have fitted has!

 

[DaveHerns]

Two pole isolator and unswitched seem to contradict one another

 

[primetime]

I was looking at the AKW and Whale instructions. That description was from AKW however the diagram only shows the 13A isolator. Will leave it up to the sparky but was curious to know what was needed, where to position etc.

Thanks for the replies.

 

[JohnW2]

Two pole isolator and unswitched seem to contradict one another

I presume that what they are saying is that there should be a 2-pole isolator 'somewhere', but that the point of connection should be unswitched (to reduce the risk of it being switched off accidentally).

Kind Regards, John