Sparks on Ze

[eskimo39]

Has anyone experienced anything like this before?

I went to a customers house to price for a consumer unit fitting as they have just moved in and at present there is just the meter and nothing else.

The earthing is via TNS and the earth clamp around the top of the main incommer seems nice and tight. I attached my green lead to the clamp and put my red and blue leads on the L & N in the meter terminals (red live - blue neutral), set my Fluke 1652B to Zi Hi, pressed the button and got sparks around the back of the earth clamp (not my fluke's clip) just behind the main service fuse (enclosed in a green metal box) also gave a reading of 1.89 ohms which is obviously a concern.

I cannot see where the sparks are coming from as it is around the back of the clamp and it is quite tight to the wall. I am now worried my meter could be at fault although it is recently calibrated and worked fine last week!!!

Any ideas what is causing the sparks??

 

[Graeme Harrold]

Give the DNO a call to rectify. sounds like the earth is not as it should be. Their problem not yours.

 

[caddy]

I've often had this happen before and its usually just becuase you dont have a good connection on one of the leads.. I would suspect the clamp although may be mechanicaly secure isnt making a good electrical connection.

 

[mogga]

If you get the DNo out ask them to fit a newHead and issolator as you will have no means of isolation specialy with it being the old cruddy metal type Possibly containing ASBESTOS in the fuse flash cover and backing