Re: buzz buzz buzz - I wonder why it does?

["Alancc" <alan.cc@xxxxxxx>]

Your body resistance stays the same, the current flow is determined by voltage divided by resistance, ie lower the voltage lower the current flow. 110v tools have lower internal resistance so draw a higher current to give the same output power as a 240v device.

 

Alancc

----- Original Message -----

From: Nick Broughton

To: ukha_d@xxxxxxx

Sent: Saturday, April 20, 2002 11:06 PM

Subject: RE: [ukha_d] buzz buzz buzz - I wonder why it does?

Keith

 

I thought it was current that killed, not voltage?  Static electricity produces very high voltages.

 

W=AV, so lowering voltage increases current to provide the same power to a the tool.

 

What am I missing in this argument?

 

Nick

-----Original Message-----
From: Keith Doxey [mailto:lists.diyha@xxxxxxx]
Sent: 19 April 2002 10:20
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] buzz buzz buzz - I wonder why it does?

Yes.

 

All electrical equipment used on building sites should be 115V maximum under Health and Safety regulations.

 

They even use different colour cable to differentiate voltages

 

Yellow = 110V

Blue = 240V

Red = 415V

 

Even things like Working Lamps are operated at 110V. Its a very sensible idea when all that water is about. Compared to using something directly powered from the mains ( 55V vs 230V )  any shock you might receive will be a quarter of what it would have been therefore a quarter of the current therefore you will almost cetainly live to go to work the next day.

 

Keith

www.diyha.co.uk
www.kat5.tv

-----Original Message-----
From: Richard Malcolm-Smith [mailto:rich@xxxxxxx]
Sent: 19 April 2002 09:51
To: ukha_d@xxxxxxxSubject: Re: [ukha_d] buzz buzz buzz - I wonder why it does?

> A site transformer is an isolation transformer designed for use on a
> building SITE (guess where the name comes from!)
> Because of the often wet environment the output is centre tapped and
> tied to ground. This limits the maximum voltage to earth to half of
> the output voltage. Most shocks are from a single conductor to earth
> so this is an extra safety feature

So do they expect everyone working on these sites to have special 115
volt tools for the job? Or does this only apply to designated high power
devices that are more prone to "Accidents" then a normal power tool?

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