110 or 240 Volts and Power Tools
Lee Taylor
questions!
- Why on industrial sites do power tools run at 100v as opposed to 240v I
can't see why ? presumably for safety?
- Is it worth spending money on an expensive power drill (dewalt) or is
there no real difference between them all ?
Thanks, sorry these two points have been bothering me for a while.
Thanks
Lee
Roy Wiggins
2. Industrial power tools are more rugged than DIY versions - so depends on
what you do and how often!
Regards
Roy Wiggins
"Lee Taylor" <l...@NOSPAM.onair.co.uk> wrote in message
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Puppy
that the maximum voltage to earth is 55 volts which although it will still
give you a jolt is unlikely to kill a healthy person, this is why they are
specified by Health and Safety
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Anthony
The downside to 110v is that it is double the amps, it's the amps that kill
you not the voltage.
A 240v machine with a rcd is safer than 110v , the breaker trips out in
milliseconds and cuts the voltage immediatley.
Expensive drills usually have better quality bits, ie better windings on the
motor, heavier bearings etc, I wouldn't call Dewalt industrial though they
are basicly B&D, some of the older stuff was good but this was really Elu.
The American market has a industrial side of Dewalt though. If you're
looking for a good heavy duty drill look for makes like Makita, Atlas or
Fein(inventors of the electric drill)
HTH
Ant
scŽumble
"Anthony" <anthon...@ukonline.co.uk> wrote in message
news:pij77.25698$B5.29...@monolith.news.easynet.net...
> 240v will kill you
Not necessarily,and I have the scars to prove it
> 110v will tickle.
Don`t think tickle is quite the word :O)
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Peter Crosland
news:pij77.25698$B5.29...@monolith.news.easynet.net...
The old adage is "Volts jolt: Mils kill" is still relevant. As little as 50
milliamps can kill but many thousands of volts are survived when the current
is low. Most people will have experience a static electrical discharge and
only suffered momentary discomfort. The important thing is to respect
electricity.
Regards from Peter Crosland g6...@hotmail.com
M Millar
Its set to 7000 Volts - damn that tickles - but very low current. Numerous
members of staff have touched it - funny to watch though.
--
Regards
M Millar
ICQ: 59367262
nemo
voltage to force them through you so 110V will force half the Amps through
you than 220V will.
You can have a 12V lighting transformer that's capable of delivering say, 25
Amps, but you ain't going to feel a thing if you touch the terminals.
Until you get up to around 30,000 Volts which directly effects the Central
Nervous System, a high Voltage at very low current is uncomfortable, but
unless you've got a dodgy heart it won't do any damage. This is when the
current starts to count. If the supply can deliver a high current AND a high
voltage, it'll make muscles contract solid including your heart - which will
stop, and it'll also burn your flesh. Not very nice.
Here's a tip. If a current passes through you from one hand to the other, it
flows through your heart and is much more likely to kill you than if it
flows from one hand to Earth, so if you're anywhere near high Voltages, keep
one hand in your pocket. Normally, even if you touch a 240V connection with
just one hand, and your not standing in water, you might feel a tingle, but
that's it. (DON'T try this - its all too easy to touch an Earthed object
without realising.)
This is particularly true if you're working on a TV set. If you get a belt
from the thick lead that goes to the side of the tube to one hand with the
other hand on the chassis or some other earthed metalwork, its goodbye
world! If you've one hand in your pocket, the worst that can happen is that
you'll wake up a couple of minutes later on the opposite side of the room
with a headache and a few bruises!
For home use I've always found Bosch power tools OK, and better value than
DeWalt, which seem horrendously expensive. I've got an industrial Bosch
jigsaw though. I'll go through oak like a knife through butter.
Nemo
Anthony <anthon...@ukonline.co.uk> wrote in message
news:pij77.25698$B5.29...@monolith.news.easynet.net...
> 240v will kill you, 110v will tickle.Some people can't let go of 110v!
> The downside to 110v is that it is double the amps, it's the amps that
kill
> you not the voltage. ??????????????????????????????????????
nemo
M Millar <michael...@bigfoot.com> wrote in message
news:kax77.126947$Do6.5...@nnrp4.clara.net...
This might raise a wry smile then:
Out walking in the country with some friends. We found an electric fence,
one meant for cattle, with the power unit ticking away merrily. One
particularly loud mouthed friend tentatively touched the wire and then
grasped it hard saying, "Look everybody - doesn't hurt a bit!"
What he hadn't noticed and I had, was that further along, the wire was down
and in a pool of water. I had heavy rubber overboots on and PVC motorcycling
gloves with me and I put them on and lifted the wire out of the water. He
didn't half yell!
Nemo
(Alias for, believe it or not, Michael Miller, with the common-as-muck
spelling!) :o)
Ant
comes to power tools & machinery used on site. The use of 110v came about
because most site safety regulations specify the use of 110 tools only on
site. A example of this is the labourer who died when the plug came out of
the 240v mixer he was using into a pool of water he was standing in. Now all
CE approved mixers in 240v have a RCD fitted. I never said 110v would kill
you just that 110v site equipment is double the amps and gives you a real
belt, this is dangerous in respect of a) dropping the tool on your foot
b) falling off the roof/scaffold/whatever
which is why a lot more sites are allowing 240v tools with a proper
industrial trip. There's even talk of doing away with 110v because 240 &
trip are safer.
PS I don't know many builders who work on TV sets
PPS I agree with you on the Bosch though they do make good jigsaws.
Ant
ch...@areti.co.uk
> Ok I hear what you're saying but this is slightly out of context when it
> comes to power tools & machinery used on site. The use of 110v came about
> because most site safety regulations specify the use of 110 tools only on
> site. A example of this is the labourer who died when the plug came out of
> the 240v mixer he was using into a pool of water he was standing in. Now all
> CE approved mixers in 240v have a RCD fitted. I never said 110v would kill
> you just that 110v site equipment is double the amps and gives you a real
> belt, this is dangerous in respect of a) dropping the tool on your foot
> b) falling off the roof/scaffold/whatever
> which is why a lot more sites are allowing 240v tools with a proper
> industrial trip. There's even talk of doing away with 110v because 240 &
> trip are safer.
>
but the extra current capability of a 110 volt circuit of the same
power as a 240 volt one is of no consequence whatsoever in the above
context. *Both* are quite capable of supplying enough current to
kill, currents of the order of 50mA up to a few amps are lethal, above
that level you tend to get serious burns but, I believe, you are
actually less likely to die.
A 240 volt circuit is more dangerous simply because the higher voltage
will cause more current to flow through your body than a 110 volt
one will. It's the current *driven by the voltage* which kills, you
will not get more current from a 110 volt circuit just because it can
deliver it, as what limits the current is your body resistance. In fact
a 110 volt circuit as used on a building site is four times safer than
240 volts because the 110 volt circuit is centre tapped and thus the
voltage to earth (which is what you get across your body resistance)
is only 55 volts.
--
Chris Green (cgr...@x-1.net)
writer
Use an RCD with 240vac, and isolation tranny with 110vac tools. Some RCDs
work at 110vac to.
"nemo" <ne...@naughtylass.wet> wrote in message
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Harrogate
Around 30mA or more across your heart - hand to hand or hand to
opposite leg) will kill you full stop. Less than 30mA will do
considerable damage - in some people even 10mA can kill, it just
depends on your constitution.
Your body has resistance. In some people it is high others low. So to
say that 12V cannot kill is wrong. I know several people who can get a
shock from 12V but as all are still alive I would guess the current
would not be high enough to hurt. I know at least one other who can
hold a 400Vdc line in a transmitter and feels almost nothing as his
(skin) resistance is very high.
The point that most people miss is that 110V from a transformer is
often centre-tapped to earth, so the output is not actually 110V but
55+55 relative to earth - which will not hurt most people. If it has
no centre tap then the output is floating so unless you grab hold of
both wires output from the transformer you will not get a shock.
Interestingly under the Electricity at Work regulations in the UK, a
workshop bench supply should be transformer fed and will be
120-0-120V, i.e. 240V centre-tapped to earth, and for protection
should have an RCD rated 10mA in the earth tap connection.
Surprisingly this does not keep tripping at such a low currect as one
might guess it would.
--
Woody
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