On Sunday, July 27, 2014 9:13:59 PM UTC+1, John Rumm wrote:
On 26/07/2014 22:38, ss wrote:

I have alongside some normal square pin 13 amp sockets some 5 amp round
pin sockets, the 13 amp works as normal but the 5 amp is switched on
from a light switch located elswhere.

The round sockets were installed maybe late 90s in an 80s house by the
previous owners, I was advised by an electrician that this was an old
format of being able to switch on table lamps from a light switch rather
than the wall socket.

Its not often seen, but its a perfectly valid and sensible arrangement
for those that life table lamps etc.

I have no idea which circuit they are on ie socket ring or lighting ring.

Could be on a lighting circuit or their own. If on the socket circuit
then there ought to be additional fusing elsewhere.

Now my question, I have recently purchased a 20 watt LED external
floodlight that comes with a 13 amp square plug, now I need to increase
the length of the cable and was looking to put a 5amp round plug on it
at the same time so I can use from the unused round pin socket.

Will this be safe to do so? With regard to Amps/wattage etc

As a rough guide, divide the wattage by the supply voltage to get a
typical current. So in that case 20 / 230 = ~87mA

Secondly I may purchase another 10 watt floodlamp so would it be ok to
run both from that 5 amp socket?

A 5A socket is good for loads up to 5 x 230 = 1150W

Its 240v, so 1.2kVA.
A 20w 0.15 pf load would consume 133VA, so the socket would be rated to power 9 of them. How many depends on the product pf.


NT