Will my mcb be sufficent for new heater with current regs?

[securespark]

more than almost twice the fuse rating..

Not taking the mick, Col, but that's a lovely juxtaposition of words!

 

[Adam_151]

what must rewireable fusewire take?

I'm not sure what BS3036 says, only that conventional wisdom is that it takes a sustained overload of 2x In to blow a re-wireable (rather than the 1.45 for an MCB or 1361)

 

[tim west]

now i may be wrong here but my understanding is that BS1362 and BS3036 fuses are grouped together in the same category of disconnection tables am i right? and that the BS1362 standard fuse is no better than a rewireable fuse jut taking one apart is proof of that, it is not hermatically sealed as a BS88 is and therefore is exposed to the elements the endcaps just push on.

if so then what chance that a 13A bs 1362 fuse will blow at 25 amps?

 

[ban-all-sheds]

There appears to be considerable leeway in the BS1362:1973 spec (disclaimer - I don't have copies of any later ones, if there are any).

 

[securespark]

All I know is that 3036's take around twice their rated to blow instantaneously.

 

[ban-all-sheds]

It's hard to be absolutely sure, when eyeballing a cramped graph with log axes, but it looks as though there's a chance that a BS1362 compliant 13A fuse might never blow at 26A....

 

[tim west]

precisely, a lot of people take a plugtop fuse as it is in a cartridge form to be as good a protection as its superior cartridge counterparts such as the BS88 range but the BS1362 fuse is basically no better than fusewire. And in fact is merely a convienient way of using fusewire saving having to wind it around terminals.

Has anyone come across some early fuse carriers for CU's that supported BS1362 plugtop fuses?