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

Fuses etc. are to protect the cables; not appliances.

How many times is it stated that the fuse/breaker is there to protect the cable. After all a 3A fuse doesn't give much protection to a 40W lamp.

Typically fuses are there to protect the cable down stream from them. However in the case of incoming cables, they often also in effect protect the incoming cable. As said, its quite likely your neighbour has a 60 or 80 A fuse in that 100A rated cutout. Daniel

But that is not what the fuse is for. It to protect the cable. If the product required protection it will be internally fitted.

It will certainly protect cables downstream of the fuse - but they (other than those to/from the meter) would, in practice, have local protection, anyway. I think that, in practice, the main reason for existence of the fuses is to protect the cables and network upstream of the fuse from the...

Here are a few important comments on the methods used in the messages above. Everyone is missing the important point about protection of the cables use. Bottom line is that the hob which has a high kW rating needs to be fed by at least 4mmsquared cable depending on the hob rating. Just use...

There is a fuse inside the boiler casing. Programmers, pumps, etc are connected to the boiler. Does this internal fuse not protect those? In other EU countries the very same boilers are connected to a circuit protected at 16 amps. We are part of the EU and regulations are supposed to be...

because the fuse in the fcu protects the cable on the outgoing side, i.e the smaller cable

An oft quoted thing... But why not. Realistically why should an appliance not have a fuse in the plug or FCU etc to protect it? Indeed the MI for the cooker hood has called for a fuse of 3A, presumably to protect the thin cable but equally it protects the appliance too.

If the fuse at the DB is small enough (NOT big enough) to protect the derated (ie smaller) fan cable, why would you use a bigger cable for the compressor? :? :? :? It works like this: 1) Your compressor and fan together need a certain amount of current. 2) The DB fuse must be big...

That supply is properly fused. It relies on the substation fuses for fault protection and the cutout fuse for overload protection. No different to the now slightly out of date switch fuse fed from a busbar chamber arrangement as found in virtually all older industrial installations.

Got an extension to wire, currently has an accient mem bs3036 type fuse box, in the property. So cannot easily add rcd protection. Thinking of adding a small consumer box in the extension to cater for 1. 6amp lighting circuit, 2. 16amp radial socket circuit. I understand that ill need to add...

Hi, Doing a PIR on a small office that has the lighting circuits (all small runs) wired in 1.5 6242-Y protected by 16A BS 88 fuses. This seems to fall just outside of the max for this cable so I'm looking at a code 4-any thoughts or opinions? Thanks in advance.

Hello all. I have a fused connection unit, which I presume spurs from the ring main, because it is connected to a single T&E cable and when I remove the 30amp fuse which I know protects the ring, the supply stops. Before plastering, I ran a 2.5mm T&E from this FCU (vertically, then...

Is there a fused spur protecting the cable to the lights / fittings?

All IEC's are bought in by manufacturers of TV's etc. IEC's are rated at 10amps. The suppliers fit a 10amp fuse and use 10amp rated cable, generally. As said, TV's have their own internal fuses to protect the TV, and the cable is protected by the 10amp fuse. Not ideal, but pretty...

The fuse is NOT to protect the extractor. It is to protect the cable.

No in that case the derated cable would be protected but you would then probably suffer from nuisanse tripping or fuses blowing as the main fuse probably wouldnt cope with the demand from the compressor. The main fuse must not only protect the cable throughout the circuit but must also be of...

It's the size of the fuse in the consumer unit that dictates the cable size, not the load you put on the end. The way to get your head around this is to think protection A fuse protects the cable that lies beyond it. You can use 2.5 mm cable if that fuse is small enough. But here we have...

Fuses in plugs are there to protect the cable, a wall wart doesn't have a cable. Most I've seen have a thermal fuse embedded in the primary winding.