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I'm in France and this is my first post, so apologies if this is in the wrong section. Here is the problem.
I have a client, with a swimming pool and heat pump for the pool, but their main supply keeps tripping. The connection is:
* Supply companies incoming feed, three-phase, limited to 30A per phase, with 500mA RDC (supply companies)
* 60 mtrs underground (all three-phase) feed to second 500mA RCD (the customers, installed before my time)
* 40 mtrs to the first Consumer unit and DP. At this DP, there is the TT earth spike and a 20A, 4 pole MCB, which is the supply to the swimming pool area
* 80 mtrs to the pool house which has its own Consumer unit. Here there is a three-phase 30mA RCD, and MCB's for the pool pump (mono phase) which is on a simple timer, heat pump (mono phase), a salt to chlorine system, and a few sockets and lights
Here is the problem. The system keeps tripping out, but it trips out:-
a) As the timer switches the pool pump off
b) It trips all the way back to the 500mA RCD. The MCB's at the pool house, or DP do not trip, nor does the RCD at the pool house
I have disconnected the earth supplied from the DP and installed a local earth at the pool house, with no noticeable effect.
Any suggestions will be gratefully received.
I have a client, with a swimming pool and heat pump for the pool, but their main supply keeps tripping. The connection is:
* Supply companies incoming feed, three-phase, limited to 30A per phase, with 500mA RDC (supply companies)
* 60 mtrs underground (all three-phase) feed to second 500mA RCD (the customers, installed before my time)
* 40 mtrs to the first Consumer unit and DP. At this DP, there is the TT earth spike and a 20A, 4 pole MCB, which is the supply to the swimming pool area
* 80 mtrs to the pool house which has its own Consumer unit. Here there is a three-phase 30mA RCD, and MCB's for the pool pump (mono phase) which is on a simple timer, heat pump (mono phase), a salt to chlorine system, and a few sockets and lights
Here is the problem. The system keeps tripping out, but it trips out:-
a) As the timer switches the pool pump off
b) It trips all the way back to the 500mA RCD. The MCB's at the pool house, or DP do not trip, nor does the RCD at the pool house
I have disconnected the earth supplied from the DP and installed a local earth at the pool house, with no noticeable effect.
Any suggestions will be gratefully received.