Just bought two of these from Maplin. One I wanted for my computer and
the other I had the idea of using it for my TV. So when TV goes off,
DVD, video and STB go off as well. A pal of mine had a small house fire
from a TV left on standby.
The one for the computer works great. But I am unsure about whether to
try the other on the TV. The problem being that the master socket on the
mains panel is rated at only 5amps. The TV plug has a 13amp fuse and the
power consumption is 150watts. A 13amp fuse seems high to me but I don't
understand the relationship between power consumption and ampage.
I could just try it and see but I would like to understand it a bit more
first. Does the TV really need a 13amp fuse?
Can anyone help?
No it doesn't, unless it is quite a huge thing that could stretch to a 5A
(my hungry 36" CRT model is happy on 3A). Remove it immediately and replace
it with a 3A fuse. Everything in your house should have a 3A fuse, with some
exceptions for high rated appliances, usually involving powerful motors or
heating elements. The exceptions which require 13A might include:
fridges/freezers (some will be happy with 5A)
Anything to do with lighting or entertainment should have a 3A fuse (or
lower if you can find supplies). I would suggest going around your house and
examining every fuse to be the right value. Whilst doing this, ensure that
the following look good:
1. Cable condition.
2. Strain relief on plug and appliance ends.
3. Outer sheaf goes all the way into plug and is secure.
4. No blackening of plug pins or socket.
5. Appliance cases in good condition.
6. Plugs fit securely and tightly in sockets.
7. No cracks on sockets or plugs.
8. No more than 2 multiways in a daisy chain. Preferably none at all.
Then get one of those plug in testers with the neon lights. Plug it into
every socket in the house INCLUDING any multiway adapters. Ensure that all 3
lights come on.
Obviously, even better would be to get the whole installation tested and all
appliances PAT tested, but this is unlikely to happen, unlike the simple
cheap tests above.
If the television really only takes 150 watts then the current should
be less than an amp unless the power factor is truly awful.
The 13 amp fuse is protecting the flex more than the television but
even so I would have thought a 5 amp one would be more sensible.
However lots of equipment seems to be supplied with 13 amp fuses
regardless of whether it makes sense or not.
In simple terms, watts = volts x amps, or amps = watts/volts
So if your TV is 150 watts, it takes a current of 150/240 amps = 0.625 amps.
It sounds like a 13A fuse is a bit of an overkill - even allowing for a
slight surge on turn-on!
Your intelligent mains panel should work fine with the TV.
Thanks for all the answers. Even with my limited knowledge I thought the
13amp fuse was overkill. But it was manufacturer fitted!
Anyway I tried the mains panel and it does work fine except what I
didn't realise is that it also detects low power states such as standby.
So everything goes off when I put the TV into standby. Not what I had in
mind, I wanted it to power down everything else when I physically
switched it off before going to bed. Otherwise to record a programme I
would need the TV and/or STB actually on.
Probably because standby draws such a tiny ammount of current that the panel
assumes the TV is off. No easy fix for this. Maybe use an X10 appliance
module(s) to allow you to send an off signal to everything you want off at
Also, it is how you would want it to work surely?
Most people just want to sense standby to turn all the other stuff off and
still be able to use the remote to turn it back on again. If you can
actually be bothered to stand up, walk across and flick a real switch, then
you might as well hit the one on the socket instead of the TV. No need for
I shudder to think of the number of things I have powered 24/7. And never
had a fire.
Certainly it wasn't advised with the very early remote control sets, but
these days? After all, anything with a clock in it etc is powered up to
some extent all the time.
*Real men don't waste their hormones growing hair
Dave Plowman firstname.lastname@example.org London SW
Get a simple switched multi-way, put it somewhere accessible and get into
the habit of using that to switch everything off rather than the TV switch.
Or if accessible use the switch on the wall outlet socket.
There's something to be said for doing this - if the switch eventually wears
out then it's a hell of a lot cheaper to replace either the multiway or the
wall socket than it would be to have the TV main switch replaced.
The TV has a static power consumption (shown on the plate) which can be
roughly converted to current (ignoring power factor) by dividing power
by 230 but there's a much larger (and unspecified) current drawn after
switch-on to degauss (demagnetise) the metalwork inside the CRT. The
degauss current may be 5-10A on the first half cycle and exponentially
decays to zero over the first few cycles. This is no worse than a CRT
monitor so if that's not popped the other mains panel you should be OK
with the TV. A 13A fuse does sound too big but you may find that the
switch-on inrush causes a smaller one to fail occasionally - suck it and
Well, they might be individually rated thus. BUT don't forget that the plug
on the end of the input lead has a 13A fuse in it, so the TOTAL current used
by the master and all 5 slaves mustn't exceed 13A!
The fuse is utterly irrelevant.
Turn the TV round.
You should find a panel listing "240V 50Hz 250W" or similar.
In practice, I'd be extremely surprised if any TV (barring really huge
projectors for 10m screens.) took 5A.
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