On Fri, 2 Feb 2018 06:37:03 -0800 (PST), wrote:

On Friday, 2 February 2018 14:04:25 UTC, Terry Casey wrote:
In article ,
says...

Someone suggested earlier that a 100W lamp could be wired
across the open ends.

That seemed a far more practical solution.


Yes - a lamp limiter - common practice for enthusiasts
renovating old radios and TVs - especially TVs.

They usually have a bulb and bulbholder mounted on their work
bench in series with the mains supply with a bypass switch to
short out the lamp when they are satisfied that no damage will
result.

20mm glass fuses may be unsuitable if it's mains fusing, they have low rupturing capacity. A light bulb is a nondestructive option.
Of course if you put a 3A fuse in the plug you don't need one in the charger - purely for testing I mean.


NT
You crafty little devil you!!

And here was me thinking that the light bulb was to help you see the
fuse blow.

20mm fuses come in a wide variety of flavours, they do not have to be
glass, but even glass ones can be low rupturing capacity.


If you wish to share your wisdom with a few hundred thousand
manufacturers that use them for mains fusing, I'm sure they will be
thankful.

AB