Can I ask your opinion in relation to neutral /earth on this rather untidy changeover arrangement located just downstream of the main isolator? There are 2no 3-pole contractors with mains in bottom left and generator in bottom right. On the stud adjacent they have connected gen neutral, DNO neutral and installation earth. The arrangement means a self-imposed conversion to an unauthorised TNCS. I can’t be sure if the existing supply is already TNCS.
I take your point Graham but I read that more as a stipulation that a consumer cannot use a TNC type approach to the wiring within his installation. So in this particular case the function of neutral and earth beyond the service head will be in parallel conductors not in a single one.
I'm confused - what's the IE requirement? Is it to connect the supplier's N to a local electrode (MEN style), or is it to connect the installation's protective conductors to the installation's neutral conductors and then to the supplier's CNE? Or are you saying the supplier provided separate N and PE but the consumer has to connect them together again?
I take your point Graham but I read that more as a stipulation that a consumer cannot use a TNC type approach to the wiring within his installation. So in this particular case the function of neutral and earth beyond the service head will be in parallel conductors not in a single one.
I'm confused - what's the IE requirement? Is it to connect the supplier's N to a local electrode (MEN style), or is it to connect the installation's protective conductors to the installation's neutral conductors and then to the supplier's CNE? Or are you saying the supplier provided separate N and PE but the consumer has to connect them together again?
