Size of supply

[fattony]

I was at a job last week where the supply fuses were

Bush Asta Cert
BS88
100 MJ30

I assumed the fused to be 100A, what does the MJ30 mean?

 

[Spark123]

I imagine its something to do with the characteristic, BS 88 come in a lot of different tags and physical sizes such as NIT, SS, TIA as well as different breaking capacities.

 

[fattony]

but I would be correct to assume 100A, this feeds a 200A isolator the supply fuse will go before the isolator!

 

[PrenticeBoyofDerry]

Does it not relate to the contact lugs?
Are they hooked shaped, classified as wedged.

 

[fattony]

I didnt pay that much attention to be honest I'll try and get another look just need to do a shut down

 

[Wontdothatagain]

what does the MJ30 mean?

MJ30 is Bush Astra's frame size and type, if it was a Lawson fuse, it would be a JPU.

 

[westie101]

It relates to the centres of the lugs. In old "money" 3inch, 3 1/4 inch and 3 5/8 inch.

 

[ban-all-sheds]

what does the MJ30 mean?

MJ30

this feeds a 200A isolator the supply fuse will go before the isolator!

Dear God...

http://www.diynot.com/forums/viewtopic.php?p=2091573#2091573

http://www.electriciansforums.co.uk...ical-forum/28841-what-domestic-installer.html

 

[RF Lighting]

It truly is frightening what's been written in the two posts on this site when you actually sit and think about it for a little while.

 

[OwainDIYer]

but I would be correct to assume 100A, this feeds a 200A isolator the supply fuse will go before the isolator!

Hopefully.

Isolators aren't supposed to "go"

 

[SUNRAY]

It truly is frightening what's been written in the two posts on this site when you actually sit and think about it for a little while.

Yep