Discuss An interesting read on RCD’s in the UK Electrical Forum area at ElectriciansForums.net
Yes.so is it saying if an installation is fitted with the most basic types of rccb or rcbos, then later say solar pv is installed,,,, then they all need changing because they wont work properly?
Post new thread still seems to be in the top right hand corner of the page, has yours disappeared?. . . . off topic here, but cant find the "post a new topic button". . . . help!
Where a microgenerator having a d.c. source does not incorporate the equivalent of a transformer providing at least simple separaton between the d.c. and a.c. sides, an RCD installed for fault protecton by automatc disconnecton of supply or for additonal protecton (IΔn ≤ 30 mA) must be of a type that will operate as intended in the presence of d.c. components in the residual current. (This does not apply where it has been established – such as from a specifc writen statement given by the inverter manufacturer – that the inverter provides galvanic isolaton between the d.c. and a.c. sides that prevents it from feeding d.c. current into the electrical installaton.)so is it saying if an installation is fitted with the most basic types of rccb or rcbos, then later say solar pv is installed,,,, then they all need changing because they wont work properly?
thx. . . .Post new thread still seems to be in the top right hand corner of the page, has yours disappeared?
A PV circuit shouldn't share the same RCD as other final circuits anyway. As the required disconnection times will probably not be achieved.
The inverter can take up to 5seconds to disconnect so if the circuits on the same RCD require a maximum of 0.4 seconds disconnection then you can't guarantee this will be achieved. For the use of type B RCD's with PV then refer to reg 712.411.3.2.1.1 same With vehicle charging points may require a type B RCD 722.531.2.101.any more expertise on this chaps and chapettes? ive actually looked through a few catalogues and they don't even list what type of rcd they are in most of them!
so its just the one on that circuit that needs to be the b+? rest of installation is normal?
I've spoken to 5 other electricians this week, nobody had come across or been taught this either!
Reply to An interesting read on RCD’s in the UK Electrical Forum area at ElectriciansForums.net
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