All fuses blowing!

[rattlehead85]

If these are MBF mercury vapour lamps you may find the ignitor to the lamp is faulty especially if they are old fittings.

 

[Blowcat]

Have you checked the voltage at each point L-N + L-E to see if your getting the right voltage.?
Assuming the fuses feed the lights at each column, could it be the lights/controls gear thats causing the problem and not the supply cable.
6 faulty lights does sound strange but do you know if they all blew at the same time or is it something thats occured over a long time and because 6 are now not working they are willing to spend some cash.
Good luck sounds a nightmare

 

[Proper Job]

Hi everyone .
I am not sure how old the lighting is but doesn't look old, it is part of the motor way so would take a long time to set up a lane closer to look at the heads,
I have hooked up test lamps at 5 of the 8 columns , and disconnected the cable drops from the faulty column lights. Power on and the test lamps work.
so I am now certain that it was the loose neutral on the three phase cable that has caused it
thanks again everyone and very good call on this one electric avenue