Cast Iron Service head???

Electricalserv · Jun 20, 2011

Went to a job today. Upon opening cupboard to service head. I am faced with what can only be described as a cast iron service head. Never seen one like this before!

Its of a large square shape with tails coming out the top. No sign of fuse. Disn't investigate if there was any way to open it.

My question is what the score with these can a board be changed or does the DNO need to upgrade it. Ze was 0.13ohms. It loos likle a tn-s

Anyone come across these?

Electricalserv · Jun 22, 2011

Right lads, went back today. Tried to open it and ceramic heads just cracked as I tried to wedge it. Even if the DNO came out the ceramics would just shatter. Its a very mad caseing.

On front it says 250v and 30 amps? how strange. Anyone know why. Inside it looks like there is 3 ceramic cylinders (seen through small gap when wedged). The door lifts off. But as you lift up the ceramics just crack. Nightmare.

Jimmyb · Jun 22, 2011

Short Circuit said:
I would very much doubt it - seems like a call to the DNO will be the option to go for and get them to sort it for you! Really, they shouldnt charge for it as like someone said earlier, its well past its serviceable life and should be ditched! Its their equipment, make them change it!

I had same thing DNO changed for free as the case is metal and is not allowed any more so nice new service head and tncs so was well happy :coolgleamA:

Knobhead · Jun 23, 2011

Short Circuit said:
forgot to mention - they are lethal when they are open and the fuses are disconnected as the main supply is open and far to easy to be touched !

Wimp ! ! ! !
Nothing wrong with those fuses. The first DB I installed was fed off them! 550V 3Ph.

nikmet · Jun 23, 2011

Electricalserv said:
Right lads, went back today. Tried to open it and ceramic heads just cracked as I tried to wedge it. Even if the DNO came out the ceramics would just shatter. Its a very mad caseing.

On front it says 250v and 30 amps? how strange. Anyone know why. Inside it looks like there is 3 ceramic cylinders (seen through small gap when wedged). The door lifts off. But as you lift up the ceramics just crack. Nightmare.

Why are you trying to open it? Do the right thing and call the DNO.