Anyone ever "LOCKED" a mcb "ON" by mistake?

[Sparky83]

No?

Neither have i..... but someone i work with (i use the term loosly) has!

The MCB had already been switched off, but for some unknown reason he switched it back on and then somehow managed to get a lock off on it but locked it on instead. But it doesnt stop there....

The reason it was being locked off in the first place was because it fed a big beast of a 110v tranny that was being taken out, it was a 63a supply. So without testing and checking for dead, he started cutting through the SWA cable.......BANG!!!!!!

Luckily for him and the guy helping holding the cable (who aint a sparky anyway) they were both ok, guy cutting got a shock but nothing more. The poor inocent hack saw blade took the brunt of it!

Shocking, literally!!!

 

[vambo]

The mcb would have tripped (broke the circuit) even if it was locked on, they are thermal trips and the switch is just a latch that doesnt force the mcb on. Eitherway it was stupid thing to do.

 

[Stroppy]

I was a good boy a while ago and bought a set of the Hager MCB locks, and a little padlock to do everything properly. Trouble is everything is so loose and wibbly-wobbly that you can still remove the locking device when it is in place and locked. Rubbish!

One way my colleague uses to prevent unauthorised numpties turning your MCB back on is to take out the Line conductor from the MCB, then take out the MCB itself and take it with you!

 

[Knobhead]

Wonderful, now why have you dragged a 2 year old post out of retirement.

 

[Stroppy]

Because I knew it would annoy you.

Anyway why shouldn't I? What is the time limit for comments?

 

[shanky887614]

you would think so wouldnt ya

electrics lesson 1 dont touch live cables but check out this guy apparently 2330l3

http://www.electriciansforums.net/e...ical-regulations/16787-i-got-shock-today.html

cant understand why touching the incoming side on an isolator in a cu would give him a shock

may the lord save us all

you say that but a guy i did the l2 and l3 course with couldnt understand why his lights wernt working (plastic conduit) and when examiner tried to turn off breaker nothing happend

he forgot to put a neturel from board to lights and wired all the browns together, blues together and cpc together.


he was dangerous but they still passed him.


it takes 30secs to tripple check voltage with an indicator stick to make sure cable is dead before you start to cut through it (after safe isolation of course)