Pulling a fuse with load on it

[ed-ectrician]

One of the first things i learnt was, if you pull a dno fuse, remove the load first.

Of course i never pull fuses but that's another story...

Has anyone ever pulled one accidentally or otherwise with a load on it? What happened?!?! Bloke i work with said it's fine but he's ex military so likes to be known as a bit of a 'crazy bloke' if u know what i mean!

Not saying all ex army are like this but you do get a few like this dont you?!

Ed

 

[Robert Turnbull]

if you worried pull it fast. the chance is if your pulling it then the load wont be that great as you would have checked your not about to turn a computer or like like off...

pulled hundreds of these hypothetical fuses and never had a problem with load over it. putting back in they often crackle but turn to put them in straight so both sides hit the contacts at the same time.

- - - Updated - - -

if you worried pull it fast. the chance is if your pulling it then the load wont be that great as you would have checked your not about to turn a computer or like like off...

pulled hundreds of these hypothetical fuses and never had a problem with load over it. putting back in they often crackle but turn to put them in straight so both sides hit the contacts at the same time.

 

[Deleted member 26818]

and dont forget partial blindness

There was a belief at one time, that the high UV emitted by the arc, could weld contact lenses to the cornea of the eye.
Fortunately this is incorrect, although in some places the wearing of contact lenses whilst welding is still prohibited.

 

[Knobhead]

Another update:

Inserting the fuse under load.
Most fuse holders have a terminal shield. It has two uses. First to protect you from the live terminals, the second isn’t to well known. If you rest the fuse holder against the shield in line with the fuse contacts, you then put you’re palm against the holder and push up and in. You can’t react and pull the fuse if there’s a fault. Hold it by the handle and you reaction is pull back. Then in the words of Ellie Goldburg. “Anything can happen!”

 

[Darkwood]

There was a belief at one time, that the high UV emitted by the arc, could weld contact lenses to the cornea of the eye.
Fortunately this is incorrect, although in some places the wearing of contact lenses whilst welding is still prohibited.

Not to forget the flash has vapourised hot metals and can on rare occasions get in your eye and damage your eyesight if not blind you...... imalways a fan of welders flash.... had it several times and now im more or less immune to it but its very worrying when it happens for first time :/

 

[rattlehead85]

Common sense should tell ya not to pull a fuse out under load unless you have no other option especially if you have no idea what the load is.

 

[tombrooker84]

A few years back I was working at Heathrow in Terminal 1. There was a guy working on some of the large chillers and pulled out a duff cartridge fuse and replaced it with a new one, I couldn't tell you off hand what size fuse, but well over 100A if not over 200A, anyway he did this under load and it blew up. He had first degree burns over 1/3 of his body, and to top it off he was on the roof and had to crawl down the stairs, through a plant room and into a passenger lounge because he was lone working. Crazy thing is the isolator was less than 1m away.

 

[stratplus]

Does anyone know the penalty for cutting the seal and pulling the DNO fuse? (Should they find out)

 

[ed-ectrician]

Does anyone know the penalty for cutting the seal and pulling the DNO fuse? (Should they find out)

A good spanking

 

[richy3333]

Does anyone know the penalty for cutting the seal and pulling the DNO fuse? (Should they find out)

Usually dire boredom caused by the next 15 pages of replies your post will cause

 

[Robert Turnbull]

Does anyone know the penalty for cutting the seal and pulling the DNO fuse? (Should they find out)

A good spanking

Ohh I better call them

 

[ed-ectrician]

Ooooh err

 

[robsparky1975]

Well as this is a hypothetical thread I would have to recommend that some degree of ppe be worn ie gauntlets and sheild,remember doing the 2391 had to be gloved and visored up,safety first etc,i have had to pull a fuse as no isolator of any means,i couldnt believe my eyes,callout at 7am,1/2 hr later worked back to mains room,200a cartidge in old 60s panel gone pop,no isolator on that,not even any isolator from dno onwards,called the guvnor,could not take all off load,hidden dbs etc,nightmare and not one i would like to see,dno quoted 30k to upgrade his supply which he needed,i bet its popped a few times since.

 

[Knobhead]

Not to forget the flash has vapourised hot metals and can on rare occasions get in your eye and damage your eyesight if not blind you...... imalways a fan of welders flash.... had it several times and now im more or less immune to it but its very worrying when it happens for first time :/

Cut the BS.

There is no difference between a welding flash and arc flash on the eyes.
You’ve not had a good flash if you think you can get immune to it. You would be in bed for days. The pain in you’re eyes and the blinding headaches are totally debilitating. Oh, and there’s the throwing up!
How do I know, guess.

Here's another little titbit for you, turning you’re head to the side doesn’t help. The ray’s refract/reflect through the slight bulge of the retina and make it worse!

 

[robsparky1975]

I have not had a fuse blow up in my face but many years ago when using a drill that decided to go bang the arcs flew out of the casing,i couldnt see for 3 mins just complete darkness,bit of a panic as didnt know what was going on could only hear people saying you ok,optics shut down by brain to save me from further injury,was relieved when regained full sight,if thats a drill imagine what some hefty loads can do.

 

[BillyTheSparks]

I've pulled 400A rewireable fuses under load. I realy don't know what the problem is.

If you do pull them don't dither about, grab it, pull it!

If it's three phase then you have to pull two at the same time. I always went for yellow and blue, red usualy has more load due to idiot electricians loading one phase.

That's useful to know...