paulroberts
Junior Member
- Joined
- May 26, 2012
- Messages
- 3
- Reaction score
- 0
We have been called in to assist diagnose irregular power outages to a restaurant in th uk.
The restaurant is fed via a 3phase and pme combined neutral and earth.
At irregular interval power drops at either the Kitchen DB, which is tpn fed via swa via switch fuse from a bus bar chamber or the Front of house db, which is tpn fed via swa via switch fuse from a bus bar.
the outages last from a second to 10 minutes, and affect all circuits connected to the relevant db.
The problem we need help with , is that data loggers prove that during each outage ( they do not affect both boards at the same time)
Voltage and current is lost to the affected board, however not loss of voltage is recorded at the bus bar chamber!
The sub mains cabling and gear is all new, and there are no inline switching devices between the switch fuse at the bus bar chamber and the incoming isolator at the db.
These faults have been present for 6 months, during which time, a complete new distribution system has been installed, 80% of the premises rewired. And the whole installation tested.
The electricity board have carried out logging and ZE and ZS to prove supply.
The shortest outage recorded was for less than a milli second, which would eliminate most switching devices.
Has any one ever come across any thing similar?
The restaurant is fed via a 3phase and pme combined neutral and earth.
At irregular interval power drops at either the Kitchen DB, which is tpn fed via swa via switch fuse from a bus bar chamber or the Front of house db, which is tpn fed via swa via switch fuse from a bus bar.
the outages last from a second to 10 minutes, and affect all circuits connected to the relevant db.
The problem we need help with , is that data loggers prove that during each outage ( they do not affect both boards at the same time)
Voltage and current is lost to the affected board, however not loss of voltage is recorded at the bus bar chamber!
The sub mains cabling and gear is all new, and there are no inline switching devices between the switch fuse at the bus bar chamber and the incoming isolator at the db.
These faults have been present for 6 months, during which time, a complete new distribution system has been installed, 80% of the premises rewired. And the whole installation tested.
The electricity board have carried out logging and ZE and ZS to prove supply.
The shortest outage recorded was for less than a milli second, which would eliminate most switching devices.
Has any one ever come across any thing similar?