Why A 3A Fuse Protecting Gas-Related Electrical Circuits?

[ianmcd]

sorry Op and to many that have posted, this is a totally worthless post, it is a 3 Amp fuse because that is the lowest available for a fused spur, the boilers electronics have further protection, modern consumer units offer much better protection than the 3 A fuse in the fused spur

 

[muggles]

No they don't.

Is a sub 3A (plug) fuse readily available?

Yes they do - Manufacturers Instructions always override gas regs. Basic principle.

1A and 2A BS1362 plug fuses are readily available, but why would you want a less than 3A fuse?

 

[muggles]

sorry Op and to many that have posted, this is a totally worthless post, it is a 3 Amp fuse because that is the lowest available for a fused spur,

No it isn't, you can get 1A and 2A fuses

 

[JohnD]

13A (brown) and 3A (red) are very widely sold in every High Street, but there is no limit to other ratings (below 13A) that can be manufactured and sold for particular needs. For BS 1362 they should be black.

 

[ban-all-sheds]

Yes they do - Manufacturers Instructions always override gas regs. Basic principle.

What do you mean by "override"?

In this case, the gas regulations do not forbid a 3A fuse, so any concept of overriding would be irrelevant.

 

[Dan Robinson]

Fook me. All we need now is Bernie to chip in.

 

[dilalio]

Fook me. All we need now is Bernie to chip in.

See post #23

 

[FiremanT]

Yes they do - Manufacturers Instructions always override gas regs. Basic principle.

Sorry, Mugs, they don't. It is a widely held wrongly believed principle.

 

[DaveHerns]

I can't see what it matters. The system works on a 3amp fuse so why would you use a 13amp fuse?

 

[Dan Robinson]

See post #23

Ah, but that was one of his rare, useful posts.

 

[dilalio]

Edit: duplicate post

 

[dilalio]

I can't see what it matters. The system works on a 3amp fuse so why would you use a 13amp fuse?

We always label the Plug or fused switch “3 amp only”

 

[vulcancontinental]

Some or at least one manufacturer supplies a 3amp fuse in every boiler box, perhaps that might be taken as guidance in one case and I can't think off the top of my head of a manufacturer that doesn't include at least one if not two fast blow lower rated fuses on the PCB somewhere.

 

[ban-all-sheds]

The system works on a 3amp fuse so why would you use a 13amp fuse?

The question is why do you think you MUST use a 3A fuse?

 

[dilalio]

The question is why do you think you MUST use a 3A fuse?

To protect the cable that is downstream of the fuse and is often of a lesser cross-sectional area, against surges ?