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I work in a large public services building near my home town and it consists of wiring that was done back in the 1950's (perhaps 12/13th Edition?) when the first buildings were erected using V.I.R. cables right up to the latest 18th Edition wiring that includes "phase matched UPS/IPS" systems and "quinetic" lighting control systems.

Here are some photos of a fault that I was working on this week where there was no supply getting to a light fitting. The switches are very old mercury tilt light switches and one of the vials had fractured causing the mercury to leak out. The mercury was held at a live potential and shorted to earth. Took me ages to find the problem.

I just thought some of you would be interested to see some photos.

Mercury residue.jpg



Switch connections - 2.jpg
 
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