In a small commercial office that was covered by a 12 way Wylex fuse
consumer unit (that had been "upgraded" with MCB's), an electrician
installed a whole installation 30mA RCD recently.
This installation covers about 10 rooms, which includes a total of 8
PC's and associated IT kit.
We are getting this RCD tripping randomly, he came out today, and I
asked if he could firt an 100mA RCD for now, but as he didn't have one
with him, and we need people to be able to work, he is going to replace
the RCD with an isolator "At our request"
My question is, is it against the regs to install this whole
installation RCD in this situation in the first place?
He said it was done because he fond one of the lighting circuits
upstairs didn't have any earth, and this was the easiest way to protect
I basically want to know if we should use him to replace the CU with a
new 17th edition one, probably with RCBO's, or we need to find another
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