Had a nice experience earlier today... Not.
Hotel swimming pool had to be closed off due to filter plant failure.
The power was isolated while some leaking pipes were replaced but it would not restart on power-up.
The big clue was the shock I got off the contactor enclosure when I pushed the green button. At some time in the past the 400v coil contactor (still laying on the floor) had been replaced with a 230v version and as there was no neutral in the pump circuit it was connected to earth instead. As the metal pipes had been replaced with plastic there was now no earth either.
The 3phase supply was a 3core flex with those long established phase colours of: black, blue & yellow!
Hotel swimming pool had to be closed off due to filter plant failure.
The power was isolated while some leaking pipes were replaced but it would not restart on power-up.
The big clue was the shock I got off the contactor enclosure when I pushed the green button. At some time in the past the 400v coil contactor (still laying on the floor) had been replaced with a 230v version and as there was no neutral in the pump circuit it was connected to earth instead. As the metal pipes had been replaced with plastic there was now no earth either.
The 3phase supply was a 3core flex with those long established phase colours of: black, blue & yellow!