Engine is fine and doesn't shut down. The generator within was tested by an engineer from the hire company as delivering correct voltage and capable of delivering 70KVA.
The house or load in this situation has an underfloor heating system that draws 30KW of power across the three phases.
There are 45 circuits, 7 lighting circuits and 7 power circuits, 20 heating elements etc. It's a very big house and needs a 3 phase supply
In total the max load will be no more than 45 KW
ALL earth tests have ben passed, EVERY cable was tested for insulation and continuity. The installation has been signed off. Post tests will be carried out in the next couple of weeks.
When the generator trips out, none of the three 100A fuses protecting each phase blow!
None of the RCDs protecting the socket circuits trip!
None of the MCBs in the board are tripping!
Sequence is as follows:
Generator is switched on with main isolator to board in ON position and ALL MCBS in board in th OFF position. One by one all 45 circuits are brought on. Always after fifteen minutes, the generator trips.
I am certain of the following:
the load from the house comes nowhere near the capacity of the generator
There are no short circuits in the insulation (all insulation tests passed no tripping on board)
No earth leakage on power circuits (no tripping of RCBO)
My question is this:
Do you think it is logical that if there is a fault in the installation, it kicks in after fifteen minutes. Surely it would happen straight away.
Sorry for the long reply, I needed to be clear