I found a 7 amp fuse. Can I fit it to my coffee filter machine, which
is rated at 1100 watts?

Am I correct in thinking that for applicances without a motor the
calculation is (volts) x (amps) plus (small margin) but for appliances
with a motor a much bigger fuse is usually needed because of surge
current when the motor starts?

On 20/12/2019 09:38, Scott wrote:
I found a 7 amp fuse. Can I fit it to my coffee filter machine, which
is rated at 1100 watts?


if it is a BS 1362 fuse so also the right size, rated for 240V, not
prone to explode...


--
Robin
reply-to address is (intended to be) valid

On Friday, 20 December 2019 09:38:12 UTC, Scott wrote:
I found a 7 amp fuse. Can I fit it to my coffee filter machine, which
is rated at 1100 watts?

Am I correct in thinking that for applicances without a motor the
calculation is (volts) x (amps) plus (small margin) but for appliances
with a motor a much bigger fuse is usually needed because of surge
current when the motor starts?

Yes and you'd need a pretty large and sustained surge, you might even be able to use a 5 amp fuse. But as you get closer to the fuses rating passing that current will (due to the fuses resistance) the fuse wire will get warm and so will the fuse, if on for long periods which a coffee maker is unlikely to get to that stage.

I also have a dozen or so 1, 2, 7 and 10 amp mains fuses.
But here we seem to have a policy of either using 3A or 13A fuses.

On Fri, 20 Dec 2019 09:38:06 +0000, Scott
wrote:

I found a 7 amp fuse. Can I fit it to my coffee filter machine, which
is rated at 1100 watts?

Am I correct in thinking that for applicances without a motor the
calculation is (volts) x (amps) plus (small margin) but for appliances
with a motor a much bigger fuse is usually needed because of surge
current when the motor starts?

For a purely resistive load like a heater, the power factor will be
very close to 1 so, as you say, you can use power = voltage x current.

You need to take power factor into account when dealing with
non-resistive loads like motors, but that's not an issue with a simple
heating element.

Mostly yes, but are you sure it does not use any other electro mechanical
device or something with big capacitors to charge via a power supply? I've
also come across fast and slow blow fuses of the same rating, the fast blow
ones have the wire under tension of a spring.

While on the subject of dissipation. I do notice quite a lot of fan heaters
can actually warm their mains cable noticeable during use at 3KW. I've often
wondered if this is entirely safe?
Brian

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"Scott" wrote in message
...
I found a 7 amp fuse. Can I fit it to my coffee filter machine, which
is rated at 1100 watts?

Am I correct in thinking that for applicances without a motor the
calculation is (volts) x (amps) plus (small margin) but for appliances
with a motor a much bigger fuse is usually needed because of surge
current when the motor starts?

I've yet to notice any explode, they may thud a bit. One of the most
annoying things is that some fuses seem to lose connections due to the dry
joint on the cap end after some years, so they don't blow just kind of act
like a resistor.
Brian

--
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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Robin" wrote in message
...
On 20/12/2019 09:38, Scott wrote:
I found a 7 amp fuse. Can I fit it to my coffee filter machine, which
is rated at 1100 watts?


if it is a BS 1362 fuse so also the right size, rated for 240V, not prone
to explode...


--
Robin
reply-to address is (intended to be) valid

Most of the plugs still come with either no fuse at all or a 13a one. I've
not actually checked devices with moulded on fuses of late, one just trusts
the maker to know, but of course if the fuse fails but not due to an
appliance fault many people bung in a 13a and never bother to look at the
old one.
Brian

--
----- --
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"whisky-dave" wrote in message
...
On Friday, 20 December 2019 09:38:12 UTC, Scott wrote:
I found a 7 amp fuse. Can I fit it to my coffee filter machine, which
is rated at 1100 watts?

Am I correct in thinking that for applicances without a motor the
calculation is (volts) x (amps) plus (small margin) but for appliances
with a motor a much bigger fuse is usually needed because of surge
current when the motor starts?

Yes and you'd need a pretty large and sustained surge, you might even be
able to use a 5 amp fuse. But as you get closer to the fuses rating passing
that current will (due to the fuses resistance) the fuse wire will get warm
and so will the fuse, if on for long periods which a coffee maker is
unlikely to get to that stage.

I also have a dozen or so 1, 2, 7 and 10 amp mains fuses.
But here we seem to have a policy of either using 3A or 13A fuses.

On Fri, 20 Dec 2019 09:38:06 +0000, Scott wrote:

I found a 7 amp fuse. Can I fit it to my coffee filter machine, which
is rated at 1100 watts?

Am I correct in thinking that for applicances without a motor the
calculation is (volts) x (amps) plus (small margin) but for appliances
with a motor a much bigger fuse is usually needed because of surge
current when the motor starts?

About the worst in domestic use is the fridge/freezer. Often a couple of
amps or less when running but will take out a 10A fuse on starting if it's a
biggish motor.
My knowledge is 30 years out of date, btw, so the starting might have
changed nowadays.
There's a device which utilises the surge at switch-on to pull in the start
winding and then drops out as the motor starts and the current drops
(klixon, IIRC).
A 3-ph. 2.5kW motor has an enormous surge for about 1 - 3 cycles and it
doesn't have a klixon. Single-phase motors do and the surge lasts a bit
longer.
--
Peter.
The gods will stay away
whilst religions hold sway

On Friday, 20 December 2019 09:38:12 UTC, Scott wrote:
I found a 7 amp fuse. Can I fit it to my coffee filter machine, which
is rated at 1100 watts?

Am I correct in thinking that for applicances without a motor the
calculation is (volts) x (amps) plus (small margin) but for appliances
with a motor a much bigger fuse is usually needed because of surge
current when the motor starts?

yes no problem, assuming it's a pukka mains plug fuse. 1100w = 4.5A


NT

"Brian Gaff \(Sofa 2\)" wrote in
:

Mostly yes, but are you sure it does not use any other electro
mechanical device or something with big capacitors to charge via a
power supply? I've also come across fast and slow blow fuses of the
same rating, the fast blow ones have the wire under tension of a
spring.

While on the subject of dissipation. I do notice quite a lot of fan
heaters can actually warm their mains cable noticeable during use at
3KW. I've often wondered if this is entirely safe?
Brian


My Dyson Vacuum warms the cable!

On Sat, 21 Dec 2019 08:52:43 GMT, John
wrote:

"Brian Gaff \(Sofa 2\)" wrote in
:

Mostly yes, but are you sure it does not use any other electro
mechanical device or something with big capacitors to charge via a
power supply? I've also come across fast and slow blow fuses of the
same rating, the fast blow ones have the wire under tension of a
spring.

While on the subject of dissipation. I do notice quite a lot of fan
heaters can actually warm their mains cable noticeable during use at
3KW. I've often wondered if this is entirely safe?
Brian

My Dyson Vacuum warms the cable!

I assume this is okay for appliances that are operated for a short
period, always supervised, but perhaps less so for applicances left
unattended.

To my surprise though, chargers can get quite warm; and they are left
unattended for long periods.

On Friday, 20 December 2019 16:56:04 UTC, Brian Gaff (Sofa 2) wrote:

While on the subject of dissipation. I do notice quite a lot of fan heaters
can actually warm their mains cable noticeable during use at 3KW. I've often
wondered if this is entirely safe?
Brian

Most flex is rated to 70C.


NT

On 20/12/2019 09:38, Scott wrote:
I found a 7 amp fuse. Can I fit it to my coffee filter machine, which
is rated at 1100 watts?

Am I correct in thinking that for applicances without a motor the
calculation is (volts) x (amps) plus (small margin) but for appliances
with a motor a much bigger fuse is usually needed because of surge
current when the motor starts?



Is it from a stairlift? They always have 7A fuses.



--
Adam

ARW wrote:

Is it from a stairlift? They always have 7A fuses.

Dad's runs from a wall-wart ...

https://a1stairliftspares.co.uk/wp-content/uploads/2017/06/20180214_085630.jpg

On Sat, 21 Dec 2019 08:59:01 +0000, Scott wrote:

On Sat, 21 Dec 2019 08:52:43 GMT, John
wrote:

"Brian Gaff \(Sofa 2\)" wrote in
:

Mostly yes, but are you sure it does not use any other electro
mechanical device or something with big capacitors to charge via a
power supply? I've also come across fast and slow blow fuses of the
same rating, the fast blow ones have the wire under tension of a
spring.

While on the subject of dissipation. I do notice quite a lot of fan
heaters can actually warm their mains cable noticeable during use at
3KW. I've often wondered if this is entirely safe?
Brian

My Dyson Vacuum warms the cable!

I assume this is okay for appliances that are operated for a short
period, always supervised, but perhaps less so for applicances left
unattended.

To my surprise though, chargers can get quite warm; and they are left
unattended for long periods.

I've a little VAx cordless and the charging from 'flat' takes 6h (for "up
to" - OK, it has a motorised brush that's witchable, so fair enough - 20m
run-time). The charger is sort of luke-cool and goes to cold after charging
is finished.
--
Peter.
The gods will stay away
whilst religions hold sway

On Saturday, 21 December 2019 16:24:36 UTC, PeterC wrote:

I've a little VAx cordless and the charging from 'flat' takes 6h (for "up
to" - OK, it has a motorised brush that's witchable,

definitely don't mess with it then.

On Sat, 21 Dec 2019 19:51:09 +0000, Chris Hogg wrote:

On Sat, 21 Dec 2019 16:24:34 +0000, PeterC
wrote:

I've a little VAx cordless and the charging from 'flat' takes 6h (for "up
to" - OK, it has a motorised brush that's witchable,

That would be the modern equivalent of a broomstick, I take it. Does
it come with a black cat and pointy hat?

oops - bloody spell checker had his eyes shut.
--
Peter.
The gods will stay away
whilst religions hold sway