RCD for a swimming pool?

[us_sparkey]

Hello group, I am curious what the BS safety regs call out for to protect equipment that will be in or around a swimming pool? Such as the pool pump motor, under water lights etc?
Thank you

 

[SPECIAL LOCATION]

Quick summary can be found here:- https://professional-electrician.co...s-electrical-installation-requirements-napit/

For the full guidance you need a copy of BS7671:2018:- https://www.amazon.co.uk/Requiremen...32181/ref=pd_lpo_d_sccl_1/262-0614196-4947649

Then have a read of section 702 "Swimming pools and other Basins"
Pages 247 to 255.

 

[us_sparkey]

Thank you for the spot on info!
So looking over the BS standard BS 7671: 2018, Section 702 on swimming pools it does not seem to have a specific requirement for the RCD but it refers to IEC 60335-2-41 which states

"The installation instructions for pumps intended to be used in outdoor fountains, garden ponds and similar places shall state that the pump is to be supplied through a residual current device (RCD) having a rated residual operating current not exceeding 30 mA"

So to provide protection against electric shock from a faulty pool pump for people swimming a pool you guys use a 30ma RCD ? Is there ever a case when you need to use one with a lower threshold than 30ma?
Thank you

 

[binky]

Thank you for the spot on info!
So looking over the BS standard BS 7671: 2018, Section 702 on swimming pools it does not seem to have a specific requirement for the RCD but it refers to IEC 60335-2-41 which states

So to provide protection against electric shock from a faulty pool pump for people swimming a pool you guys use a 30ma RCD ? Is there ever a case when you need to use one with a lower threshold than 30ma?
Thank you

not really, an average human being can take around 50mA before defibrallation (ie stopping heart or breathing) can occur. But that is based on 240V, I see you are in the USA so you work with 110V which is inherently safer than 240V, so I'm not sure what the equivalent would be.

We do have 10mA RCds but I can't think where we would use one, and have never seen one, so that's probably related to hospitals were people are ill and at greater risk

 

[us_sparkey]

not really, an average human being can take around 50mA before defibrallation (ie stopping heart or breathing) can occur.

My understanding of the standards here is they are based on the 'let go' threshold of 6ma but I think the trip time is longer than a traditional 30ma RCD. When the standards were first adopted here for pools in the 1960's it was the same as a 30ma RCD then at some point it changed.

But that is based on 240V, I see you are in the USA so you work with 110V which is inherently safer than 240V, so I'm not sure what the equivalent would be.

I think with shock / ground fault protection for people its more about the miliamps than the voltage or frequency.
There is not much different about our system there is lots of 240V stuff here. We just ground (Earth) the 240 in the middle, instead of on one end.
These days with electronic drives like VFD's input frequency does not matter much. So in a way were more compatible than ever.

We do have 10mA RCds but I can't think where we would use one, and have never seen one, so that's probably related to hospitals were people are ill and at greater risk

Interesting, the 10ma I bet is based on the let go threshold.
Cheers

 

[Andy™]

seen 10mA used in schools but

We do have 10mA RCds but I can't think where we would use one, and have never seen one

seen 10mA in school workshops, some electronics/repair workbenches etc but that's about it. don't see them very often