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Subject Topic: EHU - maths
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Message posted by petemillis08/11/2011 at 11:52pm
Outfit:  Bell tent & lavvu & Coleman Avior X2     Location:  None Entered
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Quote: Originally posted by subaqua on 08/11/2011
Quote: Originally posted by vealmike on 17/10/2011
V * A does not necessisarily = W. More accurately, it's Volt-Amps. Google "power factor".

Yes, 240V from the centre to any of the three phases, or 412V between phases.

Complicated stuff, electron herding.

actually 230V is the nominal voltage to earth which gives 400V phase to phase when multiplied by 1.732 which is sq root of 3†.†hence RMS Root Mean Sq . gives the same power calc results as an equivalent DC voltage. peak voltage will be 0.707 times higher than the RMS value.

in camping terms not overly significant on overloading a circuit .

I love "Sun Sparkies" . 2 months on a domestic course and then let loose in the real world.†keeps me in business especially on sunday afternoons when they try and change the light fittings. in reality it†makes a mockery of the reason HMGovt introduced part P and really grips a lot of apprentice trained sparkies who did a full 5 year apprenticship .

for a tiny prize ( ok non existant) can somebody tell me the significant size device being withdrawn in January 2012†.

Steve W†MIET†




Token meter.....that's a significant size device. Can I have a prize (non existent, I don't care!)?


Message posted by chris.barnett09/11/2011 at 6:58am
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We've got two EHU leads, (Aldis £4.89)These are 20 metre extention leads with 6 sockets on each, this gives us room for 12 appliances. we looked at the RCD versions but found they were around £50.00 each !!, and took up to much room. I adapted the extension leads, fitting the blue plug things ( E-Bay £4.30 ) on one end. most sites we use have 16 amp supply, normally with a spare outlet, so this gives us 32 amps, plenty for all of our electric appliances. We run the cables through our bedroom pod, they do tend to get very hot, this keeps us snug at night, once you get used to the "buzzing" sound from the cables. So don't worry about all that voltage / amp stuff, get 2 leads!.

Message posted by subaqua09/11/2011 at 8:12am
Outfit:  Vermont XLP 2012     Location:  London
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^^^^ gotta be a troll , or another sparkie ;-)

-------------
camping since I was a kid

Message posted by griff1055309/11/2011 at 9:44am
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All I know is that when I plug in the EHU my lights come on kettle boils, the fridge cools things etc.

Griff

Message posted by DaveWr09/11/2011 at 1:36pm
Outfit:  Cabanon Stellar     Location:  Notts
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Quote: Originally posted by subaqua on 08/11/2011
Quote: Originally posted by vealmike on 17/10/2011V * A does not necessisarily = W. More accurately, it's Volt-Amps. Google "power factor".

Yes, 240V from the centre to any of the three phases, or 412V between phases.

Complicated stuff, electron herding.

actually 230V is the nominal voltage to earth which gives 400V phase to phase when multiplied by 1.732 which is sq root of 3†.†hence RMS Root Mean Sq . gives the same power calc results as an equivalent DC voltage. peak voltage will be 0.707 times higher than the RMS value.

in camping terms not overly significant on overloading a circuit .

I love "Sun Sparkies" . 2 months on a domestic course and then let loose in the real world.†keeps me in business especially on sunday afternoons when they try and change the light fittings. in reality it†makes a mockery of the reason HMGovt introduced part P and really grips a lot of apprentice trained sparkies who did a full 5 year apprenticship .

for a tiny prize ( ok non existant) can somebody tell me the significant size device being withdrawn in January 2012†.

Steve W†MIET†



I suggest you go back to college. RMS has nothing at all to do with the square root of 3!!!

Just check it out, it depends on waveform shape. Also peak voltage for a sine wave (approximates to mains) is 1.414 times RMS, which is the square root of 2.

BSc EE


Post last edited on 09/11/2011 16:45:46

-------------
Dave

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Message posted by subaqua09/11/2011 at 8:30pm
Outfit:  Vermont XLP 2012     Location:  London
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Quote: Originally posted by DaveWr on 09/11/2011
Quote: Originally posted by subaqua on 08/11/2011
Quote: Originally posted by vealmike on 17/10/2011V * A does not necessisarily = W. More accurately, it's Volt-Amps. Google "power factor".

Yes, 240V from the centre to any of the three phases, or 412V between phases.

Complicated stuff, electron herding.

actually 230V is the nominal voltage to earth which gives 400V phase to phase when multiplied by 1.732 which is sq root of 3 . hence RMS Root Mean Sq . gives the same power calc results as an equivalent DC voltage. peak voltage will be 0.707 times higher than the RMS value.

in camping terms not overly significant on overloading a circuit .

 

I love "Sun Sparkies" . 2 months on a domestic course and then let loose in the real world. keeps me in business especially on sunday afternoons when they try and change the light fittings. in reality it makes a mockery of the reason HMGovt introduced part P and really grips a lot of apprentice trained sparkies who did a full 5 year apprenticship .

for a tiny prize ( ok non existant) can somebody tell me the significant size device being withdrawn in January 2012 .

 

Steve W MIET 



I suggest you go back to college. RMS has nothing at all to do with the square root of 3!!!

Just check it out, it depends on waveform shape. Also peak voltage for a sine wave (approximates to mains) is 1.414 times RMS, which is the square root of 2.

BSc EE


Post last edited on 09/11/2011 16:45:46

another reason to not use the internet on a mobile. poor editing functions now i am back on a real internet connection. 

. The RMS (root mean square) of the peak voltage of a sine wave is about 0.707 times the peak voltage. Recall that the sine wave represents a changing voltage, and it varies from zero to some positive peak, back to zero, and then down to some negative peak to complete the waveform. The root mean square (RMS) is the so-called "DC equivalent voltage" of the sine wave.

The voltage of a sine wave varies as described, while the voltage of a DC source can be held at a constant. The "constant voltage" here, the DC equivalent, is the DC voltage that would have to be applied to a purely resistive load (like the heating element in a toaster, iron or a clothes dryer) to get the same effective heating as the AC voltage (the sine wave). Here's the equation:

VoltsRMS = VoltsPeak x 0.707

The 0.707 is half the square root of 2. It's actually about 0.70710678 but numbers that small at the voltages i work with are not that important in the grand scheme. 3 decimal places is sufficient.

 

but thats all theory stuff - sadly the general advice given by sun sparkies is largely concerned with practical application and the lack of understanding can be very dangerous. one of the best i heard was about RCD protection and how it protects against overloading on campsites .

I would write a proper guide to camping electrics but in this day and age with frivolous lawsuits it just isn't worth it.

 

 

and no its not Token meters. its a protective device size



-------------
camping since I was a kid

Message posted by petemillis09/11/2011 at 8:46pm
Outfit:  Bell tent & lavvu & Coleman Avior X2     Location:  None Entered
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Quote: Originally posted by subaqua on 09/11/2011

and no its not Token meters. its a protective device size



15A and 30A

Message posted by chris.barnett10/11/2011 at 7:29am
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Time flys like an arrow, friut flies like a bananna !!

What a load of electrical cr-p, just get 2 leads, simples!


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