Thanks for taking the time to read this article, I’m sure you will find something in the content that will help keep you safe. My name is Chris Hector I’m a registered Approved Contractor with the NICEIC, (the UK’s leading voluntary regulatory body for electrical contractors). The service head is where the electrical supply enters your property, runs through the main cut out fuse and continues on to your meter. Here is an example of a service head.
This is the most dangerous part of your system. Fault currents could potentially reach into the 1000’s of Amps, more than enough to start a fire or kill someone. As such it’s not really something you should be poking around at, but here are some simple visual checks you can make.
Bonding clamps should not be attached to the service cable as can be seen opposite.
Bonding clamps are used on copper water and gas pipes. They aren’t appropriate for the lead sheathing of the service cable. The locking screw can be forced through the lead sheathing and penetrate the cable creating potential fault currents into the 1000’s of amps. More than enough to start a fire or kill someone.
If you see a bonding clamp on your service cable DO NOT TOUCH IT.
Here is a picture showing the damage a bonding clamp can do. In the centre of the rectangle the lead sheathing has been split and the yellow paper wrap is visible. This is the last layer before you get to the live and neutral cables. A lucky escape for whoever tightened this up and the Nottingham landlord. Western power had to dig up the pavement and replace the cable.
If you have any of the above issues and you are in my area you should call Western Power and inform them of your concerns (0800 096 3080). If you are not sure give me a ring and I'd be happy to professionally inspect the service head for you.
If you are elsewhere in the country you can look up your DNO on the below link