S
stick insect
I'm a NICEIC domestic installer with years of electrical experience dating back to 1979 at college but I have a bad problem at a couple of shops owned by my parents. I would appreciate any help with this problem.
The 2 premises, one shop (105) rewired in 1979 and an adjoining house (103) light circuits rewired in the January. They have been converted to one large retail premises. When turning on the lights they have been suffering from blown bulbs, some even exploding and covering the room in glass shards.
example of frequency of blowing bulbs.
Wed 13 Feb 9.00am 105 downstairs middle room
Thurs 28 Feb 9.03am 105 upstairs front room
Sat 1 March 9.05am 105 downstairs front room
Thur 6 March 9.00am 105 downstairs middle room
Thurs 6 March 9.04am 103 upstairs front room
Sat 8 March 8.53am 103 downstairs front room
Mon 10 March 6.50pm 105 downstairs middle room
When these incidents have happened there has been a big bang and the fuse has tripped.
They have seperate consumer units, both split load with no common connection other than the electricity suppliers cable is looped through the wall in the cellar. The water supply is linked onto one meter by a plastic pipe and there are no earths linked apart from the one on the supply board in the first shop. The problem is apparent in both premises and has only started happening in the last 2 years. In this time 20 large, 3 storey town houses have been build directly behind the shops. The voltage is 242 volts measured using a Fluke 1653. alll tests show circuits to be in good condition with insulation resistance greater then 500 meg.
I am contacting the relevant suppliers to see if they can help.
Do you have any suggestions please?
David
The 2 premises, one shop (105) rewired in 1979 and an adjoining house (103) light circuits rewired in the January. They have been converted to one large retail premises. When turning on the lights they have been suffering from blown bulbs, some even exploding and covering the room in glass shards.
example of frequency of blowing bulbs.
Wed 13 Feb 9.00am 105 downstairs middle room
Thurs 28 Feb 9.03am 105 upstairs front room
Sat 1 March 9.05am 105 downstairs front room
Thur 6 March 9.00am 105 downstairs middle room
Thurs 6 March 9.04am 103 upstairs front room
Sat 8 March 8.53am 103 downstairs front room
Mon 10 March 6.50pm 105 downstairs middle room
When these incidents have happened there has been a big bang and the fuse has tripped.
They have seperate consumer units, both split load with no common connection other than the electricity suppliers cable is looped through the wall in the cellar. The water supply is linked onto one meter by a plastic pipe and there are no earths linked apart from the one on the supply board in the first shop. The problem is apparent in both premises and has only started happening in the last 2 years. In this time 20 large, 3 storey town houses have been build directly behind the shops. The voltage is 242 volts measured using a Fluke 1653. alll tests show circuits to be in good condition with insulation resistance greater then 500 meg.
I am contacting the relevant suppliers to see if they can help.
Do you have any suggestions please?
David
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