Discuss Acceptable departure? in the Electrical Forum area at ElectriciansForums.net

mhar

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Been working at a large property with a tt system with a 100mA upfront rcd. Works undertaken in 2012 (inc 3 x split load cu replacements) were not documented and not done to an acceptable standard, I am encouraging the customer to seek redress.

When testing my additions the 5 x trip test is tripping the upfront rcd (with all loads disconnected). I would prefer not to temporarily bypass this rcd for testing purposes as it would be obvious that someone has been 'in there' since the 2012 works which might prejudice or muddy the waters re any complaint about the 2012 works.

Therefore my additions are rcd protected and meet disconnection times, I just don't know if the 30mA rcd which should be providing the protection is tripping within spec as the upfront 100mA rcd is tripping (within the spec for a 30mA @ 5X) but I do know that between both rcds, I am meeting the required disconnection times. Is this an acceptable departure?

The upfront rcd is likely to be done away with providing we can get a DNO earth.

I am unable to speak to Stroma technical today, they are innundated.
 
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