I work in coach building, mostly motorsport artic trailers.
These usually have a 32A 3PH supply.
I fit these with a phase correct relay, to stop some numbnuts mixing phase and neutral up on a hook-up (landline) cable.
We have just had one back with some issues including:
Phase relay faulty, so they bypassed it via the main contactor.
A/C units broken (seems the main pcb board has failed)
hydraulic system not working (a timing relay has failed)
On testing, the phase relay all works fine.
So would i be overly cynical in thinking what has really happed is this:
No power as their hook-up cable was wired wrong (phase-neutral reversed?), they have then bypassed the phase protection, then powered up putting 400V through components only designed for 230V, then bring it back as faulty.
However if this did happen, im surprised all the lights didn't blow.
Or has there been a coincidental component failure all at once......
What do we think?
These usually have a 32A 3PH supply.
I fit these with a phase correct relay, to stop some numbnuts mixing phase and neutral up on a hook-up (landline) cable.
We have just had one back with some issues including:
Phase relay faulty, so they bypassed it via the main contactor.
A/C units broken (seems the main pcb board has failed)
hydraulic system not working (a timing relay has failed)
On testing, the phase relay all works fine.
So would i be overly cynical in thinking what has really happed is this:
No power as their hook-up cable was wired wrong (phase-neutral reversed?), they have then bypassed the phase protection, then powered up putting 400V through components only designed for 230V, then bring it back as faulty.
However if this did happen, im surprised all the lights didn't blow.
Or has there been a coincidental component failure all at once......
What do we think?