3ph 100amp sw fuse

[SparkyJoe]

Apart from being the ultimate rough git, is there any electrical reason why i cart take the supply to the top of SW fuse instead of the bottom? (Cable lenth/space issues)

I feel im missing something bloody obvious but i don't know what.

Cheers Joe.

 

[Richard Burns]

Then you would have to change the fuses live.
Normally the supply comes in, is switched and then goes to the fuses, if you wire it to the top of the fuses then switching off the switch will leave all the fuses still live.

 

[Engineer54]

It depends if you have room in the switchfuse enclosure to dress cables around the internal gubbings to the input terminal at the bottom. Doubtful in today's miniaturized world... lol!!

 

[High Tower]

Then you would have to change the fuses live.
Normally the supply comes in, is switched and then goes to the fuses, if you wire it to the top of the fuses then switching off the switch will leave all the fuses still live.

Not really the fuse carriage is withdrawn from both sides or it should be

 

[Knobhead]

This is the classic is it a switched fuse or a fused switch conundrum.
A fused switch it doesn’t matter which way the supply is presented as the fuse travels with the switch blades.
A switched fuse, if the supply enters the top the fuse will be live when you withdraw it.

 

[SparkyJoe]

I was having an argument with a guy (Who worked in electrical wholesaler) in a bar, he was saying that he knew more about electrics, because he knew the difference between a a switched fuse and fused switch. I have no idea who won the argument as i was **** faced, but i assume it was me.

I Was having a bad day on the previous post, I actually Tested it in the end to check (Rotary isolator type, as opposed to the fork) and it does/did withdraw both ends, but i actually thought about it long enough to solve the problem without being a rough arse (which i hate) - I assume its a fused switch.

On another note, I was on a job, and found a bit of switch gear that im assuming is a damn sight older then me (Wood?) another fused switch lol.

http://i.Upload the image directly to the thread.com/KPnpUzP.jpg

 

[Darkwood]

You can still buy this set-up and is still common although the one in the pic may be older than you its hard to say 'not knowing your age'

 

[SparkyJoe]

It was branded the english electric company, I had a google, apparently they where taken over by GEC in 1968 no idea if they kept using the badge mind

 

[Knobhead]

That’s an EE fused switch still made today by GEC as System4. They started as EE Fortress back in the early 50’s. Bloody good gear. They are made up to 3200A.
Never had one fail.

Trying to switch some of the larger units off could be fun if they hadn’t been operated for a while. A scaffold pole came in handy more than once.

Home - Scatco Europa Ltd.

 

[Darkwood]

Scaffold pole lol done something similar .... springs like the shocks on a diablo