Search results for query: the fuse is to protect the cable

confused regarding the 5amp RCD. Do you have a separate, fuse box protecting the garage or is the circuit protected by a fuse/breaker, that is also protected by an RCD? The lights can be looped in and switch cables dropped for them, a two way function can be made by using three core and...

Regardless of whether you use a fused spur or which circuit the power comes from, the fuse is there to protect the cable. What size is it?

If that cable is overload protected by the fuse in the FCU it feeds, and short circuit prtecte by the supply fuse or breaker, then yes, it is acceptable. Not nice, but acceptable.

It doesn’t. It says MAX 5 amp fuse. It is wrong anyway as the fuse is to protect the cable not the fan which should be internally protected.

Your understanding is correct, but the fuse is there to protect the cable, so it also about the fuse being adequate to protect the cable if there is an overload. So you would normally calculate the demand required, the fuse correctly for that load and then calculate the cable size that is...

In your case, the simplest solution is not to 'add in discrimination' but, rather to reduce the number of overcurrent protective devices (OPDs - MCB/fuse) to one - so there are not two things to 'discriminate' between. An OPD is only there to protect the cable. Provided all cable is fat enough...

You wrote: 1. All cables must have fuse (etc.) protection. 2. If the cable is good enough. It is preferable NOT to have an RCD for SWA. No. 1, did not answer the question of fuse protection as the cable leaves the house. We all know all cable need fuse protection, so the answer was...

As you imply, it would not be needed if the cable to the garage were meaty enough to be adequately protected by the DNO fuse - just as the 'tails' from the DNO fuse to the CU don't need any additional protection. However, that would require that the cable to the garage were of a similar CSA...

Just to clear it up the cable from the socket to the fcu is 1.5mm2, its protected by a 3amp fuse in the fcu.

No, the purpose of the fuse is to protect the cable not the equipment on the end of it which should be internally protected. The manufacturer has no way of knowing that a fused plug will be used (could be a 15 amp type in the UK or a Schuko elsewhere) so must internally protect it.

Electricity isn’t exactly like water! When there is a load on a circuit, the lowest fuse/MCB etc is the protection limit for the cable as well as the boiler, programmer, pump, valves, etc.

Hey all, I have one of this http://www.wickes.co.uk/Exterior/Exterior-Socket-with-RCD-protection/invt/195044 as I need to have access to power from outside of the garage. Inside my garage, I have a power point. I plan to remove the cover and also remove the socket holder to access...

Then they are stupid, as the 3a fuse does not do that and is not designed to do that. Once again the external fuse is to protect the cable not the appliance on the end of it. The appliance MUST have internal protection or it would not be safe.

Also a 3A BS 1362 fuse would provide absolutely no protection to the device. It is for protection of the cable. If internal fusing was required, it certainly wouldn't be a BS 1362 fuse! So fitting one was only about complying with manufacturers' instructions - it was never, and could never...

The fuse is there to protect the cable. If this is a spur from a ring final then the cable must be the same size as the ring (usually 2.5mm²). The spur will terminate in a fused spur and this will have a fuse as recommended by the boiler/programmer manufacturer. Usually 3amp. If its 3 amp...

What size is the cable? What fuse is protecting it? Work is in the kitchen so notafiable.

Why? the cable is protected by the 3A fuse so I don't see a problem.

OP you may well be right that the cable fitted between the fused spur and internal connections will be good for 16 amp, but what about the internal wiring? from the connection onwards? Will this wiring be able to cope with 16 amps?... The cable fitted may well be what the installer happened to...

Sorry Spike, I'll have to disagree. The fuse in the main board is there to protect the CABLE that runs from the fuseboard. We do not know the size of the cable or the fuse but if we assume that the cable is 6mm and the fuse is 32amp then this should stay as it is. On the end of the cable he...