why is the use of bs3036 not permited

[paulthemagpie]

hello peeps,

got a quick question i would be most greatful to get an answer to:

Why do the requirements of the 7671 for PFC may not permit the use of a BS3036, semi enclosed device as means of covercurrent protection on a home re-wire

regard magy

 

[telectrix]

mainly because it's almost impossible to fit a nail across an MCB.

 

[paulthemagpie]

a nail

 

[trev]

Yeah, seen it loads of times.

 

[trev]

Look at the time current curves. You'll find the answer

 

[DurhamSparky]

nails and off cuts of cable...

might as well murder your family with a kitchen knife as they will die in the fire any ways!!

 

[Deleted member 26818]

In situations where Ze and PEFC are such that the device will not operate and provide disconnection in the required times.

 

[ipf]

He's hoarding used 3036's nicked from defunct cu's.

 

[IQ Electrical]

hello peeps,

got a quick question i would be most greatful to get an answer to:

Why do the requirements of the 7671 for PFC may not permit the use of a BS3036, semi enclosed device as means of covercurrent protection on a home re-wire

regard magy

Because the breaking capacity of a BS 3036 fuse is typically between 1 and 3kA so in situations where measured PFC exceeds this, the device cannot comply.

There is of course back-up protection from upstream devices but the above will answer the exam question.

 

[paulthemagpie]

He's hoarding used 3036's nicked from defunct cu's.

your right! lol

Nar its to do with an assignment I've got.

I thought the main reason was because these types of fuses dont meet the min disconnection time as per the regs

regards

magy

 

[trev]

nails and off cuts of cable...

might as well murder your family with a kitchen knife as they will die in the fire any ways!!

Made me chuckle Durham, I wish there was a Love It button

 

[paulthemagpie]

but they is a "like" button which is just as good! lol

 

[trev]

I tried pressing it lots of times mate. It only works the once

 

[IQ Electrical]

your right! lol

Nar its to do with an assignment I've got.

I thought the main reason was because these types of fuses dont meet the min disconnection time as per the regs

regards

magy

But the question specifically mentioned PFC.

 

[paulthemagpie]

yes thats right, i was asking

Why do the requirements of the 7671 for PFC may not permit the use of a BS3036, semi enclosed device as means of covercurrent protection on a home re-wire

 

[paulthemagpie]

hello peeps, so the fact the question was specifically to do with PFC does this change the answers above??

thanks you

 

[Richard Burns]

IQ has the answer for you, they may not have a sufficient breaking capacity for the PFC.

 

[paulthemagpie]

so im i right in guessing this question is asking why we wouldnt choose bs3036 over newer RCDs?

and basically it because it doesnt have the right min disconnection times

 

[telectrix]

so im i right in guessing this question is asking why we wouldnt choose bs3036 over newer RCDs?

and basically it because it doesnt have the right min disconnection times

MCBs, not RCDs! it's not just the disconnection time, it's also the low kA rating. MCBs are rated far higher in terms of breaking capacity.

 

[paulthemagpie]

oh i see, so only possible to be used in small installation!

 

[telectrix]

why would you even want to use 3036 fuses on a rewire, anyway. that's like using a WWI biplane to combat MIG 29s.

 

[paulthemagpie]

hello,

i understand why now, but didnt when i asked the question. lol

thanks anyway everybody for helping me to understand this


regards