Currently reading:
Time Delay RCD For A commercial premises

Discuss Time Delay RCD For A commercial premises in the The Welcome Forum area at ElectriciansForums.net

Reaction score
0
I have changed a new fuse board in a Shop with about 4 Fridges and i have got a problem with the RCD keep tripping and I put 100ma time delay RCD instead of the 30ma and the RCD Tripped few times and then stopped tripping all the test was passed but I don't know if this comply with the regs or not so can anyone advice please.
thanks
ben
 
You removed 30mA RCD protection without knowing whether it was required?

I would suggest you would fail the test of a competent person carrying out this work, and therefore have carried out work unlawfully.
 
Really?
The OP changed the fuse box, so probably installed the 30mA RCD.
Has now found that the fridges are causing the RCD to trip.
If the fridges are connected using 20A (or lower) plugs then the sockets either need RCD protection or a documented Risk Assessment indicating 30mA RCD protection is not required.
The question should not be whether 30mA RCD protection is required, but whether it can be omitted?
 
Hi Ben and Welcome to the Forum!
This is a bit of a baptism of fire, but hopefully you'll get the advice you need. My first step would be to find out what is causing the 30mA RCD trips :)
 
The cables supplying the fridges also may require additional protection if concealed in the fabric of the building ie wall <50mm
I don’t believe this regulation can be omitted by a risk assessment, only by other means such as earthed containment etc.
 
Really?
The OP changed the fuse box, so probably installed the 30mA RCD.
Has now found that the fridges are causing the RCD to trip.
If the fridges are connected using 20A (or lower) plugs then the sockets either need RCD protection or a documented Risk Assessment indicating 30mA RCD protection is not required.
The question should not be whether 30mA RCD protection is required, but whether it can be omitted?
He should tell us what the rating for the protective devices are.
Just mentioning 30mm RCDs is not enough
What are the type of circuits these fridges are on?
 
It soumds mate is if you are a little out of your depth. You cannot just keep changing RCDs until they stop tripping. It does not matter how long the time delay is if you have a neutral to earth fault.

You need to go back to basics and first determin if RCDs are required. Then what rating and where on the installation they should be fitted.

If you have a TT and this is why younhave installed a 100mA S Type then you will need to install 30mA RCDs/RCBOs on the fridge circuits (assuming they require it) that also switch the neutral. If they don’t a neutral - earth fault will take out upstream RCDs.
 
Just a thought - have you thought about inviting a local EF member to join you on site on this one who has more experience of installations requiring or not requiring RCD protection and investigating rcd trips? (Who knows it might open up further joint working opportunities.)
 
This thread hasn't been replied to for 14 days, so replying to this one may not get a response. Post a new thread instead.

Reply to Time Delay RCD For A commercial premises in the The Welcome Forum area at ElectriciansForums.net

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc
This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock