BILL15A TRI-LINK STEEL ISOLATING LINK BOX

[highpeakrider]

Hi

I have one of these that was installed years ago to feed a garden pond using pyrex, what function does it perform and should it be replaced?

 

[westward10]

It is essentially a three terminal connection box and is not likely to need replacing. It has been used to connect the outgoing MI (Pyro) cable.

 

[Lucien Nunes]

Over the last few decades we have got used to lockable rotary isolators and people are happy to rely on them for isolation. This was a previous method that puts a much bigger airgap in the circuit. Inside is a removable contact block like a 3-pole fuse carrier, that can be removed and taken away by whoever is working on the circuit. Personally I would trust it much more than a modern plastic thing with 3mm contact separation, but it's not technically lockable so wouldn't be installed today.