why would they sell a 2A lamp switch?

[Wal]

>Yes you need an earth cable to the lamp Just keep the 3A fuse they are different than the glass fuses I have never seen a smaller one fitted to a British 13A plug

Okay - but it wasn't a glass fuse - it was a fuse for a household plug - like this: http://www.diy.com/departments/bq-1a.../177930_BQ.prd

I've seen 2A online, but not on the high street...

Wal.

[Clive S]

>Yes you need an earth cable to the lamp Just keep the 3A fuse they are different than the glass fuses I have never seen a smaller one fitted to a British 13A plug

Okay - but it wasn't a glass fuse - it was a fuse for a household plug - like this: http://www.diy.com/departments/bq-1a.../177930_BQ.prd

I've seen 2A online, but not on the high street...

Wal.

Ok Wal you win But I still would not use one as when a lamp is first lit it will draw a lot more current for a few m/seconds and might just blow a 1A fuse. But hey it is your decision

[Wal]

Heh - Clive - you know me, I know NUFFINK..!

I was just a bit confused as I'd have thought you'd want the fuse to blow before an unsuitably high current went further up the pipe... Dunno, maybe I'm just over-thinking it..!

Wal.

[m_c]

You are over thinking it.

While you are technically correct, even a 2A rated switch will more than likely survive switching a load that will blow a 3A fuse.
You've got to consider what kind of load that's likely to blow a 1A fuse, but not a 3A, and not be noticed in a basic lamp?
L&N would need to be shorted together in such a way that they only drew 2.5A, and what is the real possibility of that happening?

The far more likely fault, is L and/or N wires rub through on something earthed, in which case it should trip the RCD. Even if you don't have an RCD upstream of your sockets, you should notice a fault before it even gets to the point of blowing a 1A fuse.

[Web Goblin]

For a standard uk BS1363 square 3 pin plug the fuse sizes are 3amp and 13amp. There used to be 5 amp but this was done away with a few years ago.
So for your lamp fit a 3 amp fuse that complies with BS1362.

[john swift]

one inch 1A , 2A, 3A 5A , 7A ,10 and 13A HRC (High Rupture Capacity) Fuses for the UK 13A plugs are available
but the range in the typical high street shop is very often limited to 3A, 5A & 13A

John

PS

https://www.tlc-direct.co.uk/Main_In...20plug%20fuses

[pinballdave]

The 2A rating on the switch is the breaking capacity of the switch. That is that it will reliably switch off a current of 2A without the inevitable arcing across the switch contacts welding the contacts closed. The switch itself will be safe to carry higher currents without damage if it remains in the on position, far higher than is necessary to blow a 3A plug top fuse.

As m_c said the only over-current situation you are protecting against by choosing a lower value fuse, is an overload between 2A and 3A occurring while the switch is being turned off. As the lamp holder is designed for lower wattage bulbs (max 100-150W) and I don't believe there are bayonet fitting 500-750W bulbs easily available that could be used, you can state that the design load is inherently low enough to ignore this.

If the lamp holder is fully insulated (has the box inside a box 'double insulated' symbol on it, then you don't need an earth cable. The flex must also be double insulated (ie brown/black insulated wires inside an insulated sheath). If the flex is only single insulated it _must_ be replaced, also if it's black/red then it would be wise to replace it with something a bit newer.

Dave.
(16th edition qualified electrician)