- Reaction score
- 25,487
The risk assessment isn't to decide whether additional rcd protection is or isn't required but to justify its omission.
Discuss RCD omission risk assessment in the Commercial Electrical Advice area at ElectriciansForums.net
Why not a 32A plug with an in-line FCU?I understand that the supply cable from plug to machine will need to be made bigger and may well need some over current protection adding to the machine.
This was actually the reason I bought Codebreakers, Part 2 explains the process of risk assessing omission of RCD’s and gives some useful examples of the things to look for as well as a model form for this particular RA.Agreed, I would love to see a sample risk assessment.
I would want to understand this aspect too. Is it normal for the 6A machine to have 30mA of leakage? Or is it that there’s several m/c on one circuit?what they are finding is that the rcd's are tripping when being used.
Look up the definition of a socket-outlet in the regulations, sadly you can't use this method to get around the problem.If you're omitting RCD protection, use sockets that are not standard 1363 ones, some come with a T shape pin, that way only modified equipment can be used, any attempt to circumvent this then puts the onus on the modifier (modifee?) and not the spark as they took methods to ensure a degree of protection (using nonstandard sockets/plugs)
They are 32 amp 3 phase N&E interlocking sockets and were installed last year, I’m well aware myself that BS7671 states that they need to be on rcds, however as reg 411.3.3 states that rcds can be omitted with a risk assessment. I’m guessing people are going to maybe come back and say they should be rcd protected, however what is the difference if the same piece of equipment was to be installed on a rotary isolator without rcd protection.What rating are these sockets and when were they installed.
Agreed, but bear in mind Appendix 2 item 11, which states that "for the purposes of BS7671 a risk assessment should involve an appropriate electrically skilled person."Hard wiring an appliance is certainly a way around this. A risk assessment should be carried out by the client if additional rcd protection is going to be omitted.
Can I just ask what is the difference in the safety aspect if the same piece of equipment is hardwired, apart from the one time the plug is inserted then the inbuilt rotary isolator is turned on, everything else is exactly the same, the same piece of equipment will still be sat there with the same piece of wire connecting it to the isolator, all be it one has a plug and one doesn’t. Also does it have to be the client that has to produce the risk assessment or can it be an installer or designer that can produce the RA. Only ask as previous posters in this thread have mentioned they have added RA’s before.Hard wiring an appliance is certainly a way around this. A risk assessment should be carried out by the client if additional rcd protection is going to be omitted.
I've given an example just as you posted this ? it's from a design projectAgreed, but bear in mind Appendix 2 item 11, which states that "for the purposes of BS7671 a risk assessment should involve an appropriate electrically skilled person."
As has been said in this thread, it would be interesting to see an example of such a risk assessment.
The difference is you have no control over what someone may plug into a socket outlet, whereas with fixed wiring you know exactly what it is supplying.They are 32 amp 3 phase N&E interlocking sockets and were installed last year, I’m well aware myself that BS7671 states that they need to be on rcds, however as reg 411.3.3 states that rcds can be omitted with a risk assessment. I’m guessing people are going to maybe come back and say they should be rcd protected, however what is the difference if the same piece of equipment was to be installed on a rotary isolator without rcd protection.
Reply to RCD omission risk assessment in the Commercial Electrical Advice area at ElectriciansForums.net
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.