14 May
2013
14 May
'13
1:27 p.m.
On 13/05/13 22:16, Tony Duell wrote:
I thought you lived round the corner from the Farnell trade counter or
something...
Anyway, I didnt say 'autotransformer'. In fact I don't like runnign 110V
stuff from autotransformers. If the live and neutral gets swapped in the
230V circuit, the insulation of the 110V unit has to stand 230V. It
should manage that, but....
I would use a power tool transformer. That's an isolating transformer
with the secondary (55-0-55V centre-tapped to earth). Very common
(althugh not cheap), the common oen is rated at soemthign liek 2500VA
continuous, 3000VA for 30 minutes.
Just aobut any company that seels industrail portabel power tools will
sell them. Even places like Screwfix probably have them.
I have some 110V power tools (electric drill, etc) that I use if I am
working outside. It's not required that I do this, since I am a hobbyist,
but I prefer to be safe than sorry. Of coruse the transformer gets used
for running US stuff wehn it;'s not in user for power tools.
I am actually suprised you don't ahve such a transformer...
-tony
So? Give it 115V. I would be very suprised if it
cared abotu the
difference between 50Hz and 60Hz.
I find a 110V step-down transofrmer to be essential in the workshop.For
thigns that don't need one side of the mains to be close to ground
potential (which is 99.(% of stuff) I uses a power tool transofrmer
(55-0-55V with an adapter cable. That;s good to 3kVA. I have other
smaller transformser ( a few hundred VA) with totally floating outputs.
The problem is that it has a 400W power supply... the largest
autotransformer I can get locally is a rather nasty 300VA cheapie. :(