rcd requirements on a tt system

[Engineer54]

Fortunately or unfortunately, i prefer to live in the real world rather than what BS7671 says!! On a UK TT system, If you lose the 30mA RCD operation for any unforeseen reason, that's your installations (or part of) earth fault protection gone!! There is nothing additional about them, only good while they are working....

In the vast majority of UK TT situations, the up-front 100/300 mA S type won't exist!!

 

[D Skelton]

Fortunately or unfortunately, i prefer to live in the real world rather than what BS7671 says!!

As do I. When the question regarding back up protection by way of a type-S up front comes up I think you'll find we have little to disagree on! I also agree that in parts the BGB spouts utter nonsense, however all I have done is provide answers to MINIMUM requirements and certain definitions.

Nonsense or not, the BGB is all we HAVE to follow but if you were to ask me how I would personally do it I would be on your side the whole way! (Apart from the whole 'effective Ra value' debate )

 

[Engineer54]

As do I. When the question regarding back up protection by way of a type-S up front comes up I think you'll find we have little to disagree on! I also agree that in parts the BGB spouts utter nonsense, however all I have done is provide answers to MINIMUM requirements and certain definitions.

Nonsense or not, the BGB is all we HAVE to follow but if you were to ask me how I would personally do it I would be on your side the whole way! (Apart from the whole 'effective Ra value' debate )

With a little effort at times, you may well be surprised at the results you can achieve. It's the do nothing attitude that pee's me off!! lol!!