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240 volt electronics

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Jeremy

02-13-2002 22:15:57




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In a 240 volt power cord out of the blue and brown wire which are negative and which is positive?




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Dave F.

02-17-2002 19:00:48




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 Re: 240 volt electronics in reply to Jeremy, 02-13-2002 22:15:57  
Jeremy, Since you are monkeying around with 240V. Get your self a double pole/ single throw switch ( D.P/St ) this way you open up both lines of your 240 volts should be avaiable as an inline switch. Dave F.



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CJ

02-15-2002 08:27:13




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 Re: 240 volt electronics in reply to Jeremy, 02-13-2002 22:15:57  
Sorry Mate! Didn't mean to confuse you . Just did not know you were not in the USA.RandyB has a good site listed that will help you out. G'Day!



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RandyB

02-14-2002 09:01:37




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 Re: 240 volt electronics in reply to Jeremy, 02-13-2002 22:15:57  
Since you said electronics, I think you are talking about a computer or other electronic piece of equipment. The 240 selection in electronic equipment is for Great Britian and other parts of Europe that use 240 volt 50 Hz power as standard voltage. In that case the brown is HOT and the blue is neutral (Europe and G B Only). In the USA if you use 240 volts then brown and blue will both be HOT and the neutral will not be used. There is no positive or negative as has been explained in AC but many refer to HOT as positive and neutral as negative which is wrong but works for keeping the wires separated. It might help if you tell us what you are trying to connect to 240 volts and why?

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Jeremy

02-14-2002 23:28:14




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 Re: Re: 240 volt electronics in reply to RandyB, 02-14-2002 09:01:37  
I am 15 and live in australia and would like to install an inline switch on a 240ac 60w lamp. There is no earth wire which as i know is green and yellow the is only a brown and blue line and i would like to know which is the active wire.
thank you



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RandyB

02-15-2002 06:59:24




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 Re: Re: Re: 240 volt electronics in reply to Jeremy, 02-14-2002 23:28:14  
I thought you might be in different country than USA. As Llamas said, the brown wire is the hot wire and the switch should be in the brown wire leg. Be careful because 240 AC can be dangerous.



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RandyB

02-15-2002 07:06:08




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 Re: Re: Re: Re: 240 volt electronics in reply to RandyB, 02-15-2002 06:59:24  
Jeremy you might want to look at his site in Australia.
Plugs In AU



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llamas

02-15-2002 04:15:36




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 Re: Re: Re: 240 volt electronics in reply to Jeremy, 02-14-2002 23:28:14  
Jeremy - you are likely confused because most poster here are in the USA and are talking about 240 volts AC as it is distributed here - from two points of a star-configured - well, never mind.

What you have in Oz is straight 240 volts AC across two wires. The cord you have contains no earth ground connection, which is legal in Oz for devices like lamps and such.

The brown wire is notionally "hot", and this is the one which should have the switch in it. The blue wire is notionally "neutral". However, be aware that, in your electrical system, neutral "floats" relative to earth ground and may be at a considerable voltage relative to earth ground - as much as 30 or 40 volts, enough to give you a happy jolt.

It's important that you get the switch in the right wire. If you don't, you run the risk of getting a shock from exposed parts of eg the lamp, even when you think it is turned off - as, for example, when changing a bulb.

HTH

llater,

llamas

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CJ

02-14-2002 07:57:08




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 Re: 240 volt electronics in reply to Jeremy, 02-13-2002 22:15:57  
In AC power the terms positive and negative does not apply in regards to which wire is positive or negative. As Ralph said you have two energized colored conductors that each suppy 120 VAC and a Neutral, not negative, White wire that is not charged which supplies a path back to the neutral bar in your panel. Most newer 240VAC also has a bare ground wire going back to the grounding bar in the panel.

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paul

02-14-2002 08:03:47




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 Re: Re: 240 volt electronics in reply to CJ, 02-14-2002 07:57:08  
And don't use the bare one! It's there for when trouble occurs. You don't want that wire to actually be used for anything. Sometimes it looks like it goes to the same place the nutral goes, but in the whole big electrical system your house is, you don't want that wire to be used for anything other than an emergency ground.

--->Paul



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Big Jake

02-14-2002 09:52:22




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 Re: Re: Re: 240 volt electronics in reply to paul, 02-14-2002 08:03:47  
Sorry Paul, the bare one would be an "equipment ground". It is used to "connect the noncurrent carrying metal parts of equipment, raceways & other enclosures". Usually this conductor is bonded to the grounded conductor. Alwys check the NEC & local code!

Electricity can be unforgiving. The unqualified
would be wise not to hand out advise



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paul

02-14-2002 11:34:55




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 Re: Re: Re: Re: 240 volt electronics in reply to Big Jake, 02-14-2002 09:52:22  
That's what I thought I said. Maybe the lingo is different 'here' than 'there'.

Anyhow, I don't think you are disagreeing with me? The 'bare' wire should not be used for any hot or neutral hookups of any kind? It's there to ground all surfaces & provide protection back to the box.

At least that's how I learned it.

--->Paul



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Ralph Ia

02-14-2002 07:29:48




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 Re: 240 volt electronics in reply to Jeremy, 02-13-2002 22:15:57  
On a 240 volt cord each wire carries 120 volts to make 240. You need a third wire for the negative.



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