DP RCD for Solar PV?

Question

We are currently installing solar pv systems, and have had a third party at one of our installs carrying out an EICR. They have flagged a C2 for the RCBO we have used only being single pole.
In section 712 of BS7671 ‘Special Locations – Solar PV’ we cannot see a regulation that states that a double pole RCD is required. Any advice on this matter would be greatly appreciated.

AJJewsbury · Accepted Answer

Section 712 does not refer back to 551.7.1. 
 
 You can't read any part 7 section on it's own - as the introduction (section 700) says, the sections 'supplement or modify the general requirements'. If a part 7 section doesn't say something on a particular subject then the main parts of the regs apply directly. There is no 712.551.7.1 so 551.7.1 applies unchanged. 
 At least that's my take on it! 
 - Andy.

gkenyon · Answer

Andy Jewsbury is correct, 551.7.1. Part 7 does not have to "refer back" - if there were a Regulation 712.551.7.1, it would modify 551.7.1 - but there is NOT a 712.551.7.1, so that Regulation from the General Rules applies wholesale. 
 However, most inverter manufacturers recommend RCDs are avoided ... sometimes necessary for TT systems (or other applications) though ... so unless this installation is TT, perhaps question why an RCD is used ? (Solar PV CoP has this advice).

DP RCD for Solar PV?

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