On 23 Mar 2018 09:55:54 GMT, Bob Eager wrote:

On Thu, 22 Mar 2018 18:50:17 -0700, gopalansampath wrote:

On Tuesday, March 20, 2018 at 2:48:07 AM UTC+11, Graham. wrote:

Which is the best fuse to use (3A, 5A or 13A) with a 1.15kW electric
fire at a potential difference of 240v
1150/240=4.79 so theoretically a 5A fuse shoud do.
--

Graham.
%Profound_observation%

May be 5A will do, as "cold" heater element resistance would be higher
than normal heating.

Surely it's the other way round.

AIUI the type of heater that is in an incandescent lamp - filament, of
course - has low initial resistance so that it comes on 'instantaneously'
whereas an electric fire/kettle/shower is pretty well constant.
Cold inrush to a 3kW kettle+bad idea.
The 2 elements in my electric shower, measured when cold of course, have the
resistance corellating to the rated power.
The electric kettle stays the same, although the meter won't show the power
for the first cycle or two.
--
Peter.
The gods will stay away
whilst religions hold sway