3 phase explosion

[Guest123]

I have come across this before but only where the busbar bar connection prongs are of the fork type rather than one solid stub.

With a TP MCB, it is possible to get one half of the fork of one phase in the same connection terminal as one half of the fork of another phase, consequences are BOOM!


I've only ever known older ABB/wylex/crabtree DB's to have this fork style prong in them, not any other though.

 

[Guest123]

Similar to this.....

 

[Guest123]

Sorry to keep going on but, having had a think about it, Dorman Smith DB's do have this fork style arrangement in them also.

Believe it or not, it is quite easily done. I would be 99% certain this is what happened.

 

[Knobhead]

Qed . . . .

 

[Bobster]

Even in HV situations where I could hear the air ionising (winding ocbs back in). It would take a long time for a dangerous amount of O3 to build up, it turns back to O2 fairly quickly at sea level so I can't see the board being filled with it.

 

[Knobhead]

Why won't this board allow all capitalised words?

 

[DurhamSparky]

beacuse its a sign of shouting and been a hush hush, nancy pancy forum now shouting is banned...!

bit like plastic knives on aeroplanes!

 

[Guest123]

It's a rubbish File but, if you scroll down to "fitting and removal of MCB's" I think you'll catch my drift about the fork issue.

 

[Knobhead]

Well our OP has just looked back in. Didn't seem inclined to reply.

A question to the OP, "did you seriously think we would defend your actions?"

You took the chance!

 

[shagbite]

yep. dorman have twin pronged terminals and this bloke has definitely straddled two phases. i bet his ears are still ringing.