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P

piz

Hello all,
I have been to a property with a crabtree starbreaker board main switch is 80A 30ma rcd.
The customer thought the dishwasher was tripping electrics I teste IR when I tested RCD it tripped on times half!
I have ordered a new one but when the breaker is turned off for the PV the rcd no longer trips, Would this be a PV fault been insalled over a year can we test them? (PV)
wht would it trip if only feeding?
Cheers
 
You may have got a better response posting in the solar photovoltaic forum rather than tools and products.

PV generates stray DC voltage on the AC side and can trip an RCD very readily. This is not a fault, it is characteristic of PV.
Normally PV is installed in such a way that it is not required to have an RCD on the circuit.
Check the installation method and see if the PV can be relocated on a non RCD circuit.
 
Whoever installed the PV system on a board protected by a single RCD has created a dangerous situation.
Many, if not all of the circuits protected by the RCD would be required to disconnect within 0.4s. A PV inverter can take up to 5s to shutdown which means than circuits could remain energised via the inverter for longer than their 0.4s maximum when the RCD trips.
I suggest that the PV system is removed from the upfront RCD protected CU, a separate 2 way CU is installed via henley blocks in the main tails and the PV is fed from that.
 

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