On Saturday, July 19, 2014 5:50:58 PM UTC-4, John G wrote:
explained on 20/07/2014 :
On Friday, July 18, 2014 8:49:45 PM UTC-4, John G wrote:
wrote :
On Thursday, July 17, 2014 6:42:43 PM UTC-4, amdx wrote:
On 7/15/2014 1:20 PM, wrote:
Overhead commercial lighting voltage is 277 so its less current and less
dangerous, but what if a contractor is still more picky?
I'd like to correct your thinking above.
While it is true, that a light using 277 Volts will draw less current
than a light using 120 Volts, assuming equal wattage lights,
it is false, that 277 Volts is safer than 120 Volts.
The 277 volt line may only deliver 1 amp to the light, it most certainly
could deliver several hundred amps for a short time and 20, 30 or even
50 amps continuously.
In any event, the power of commercial (even residential) wattage is
dangerous, but with more of it in voltage, its safer.
Please do not post rubbish.
There are some people trying to learn here.
The wattage used has no bearing on the risk of electrocution.
Any voltage above about 50 is considered dangerous and 240 is worse
than 120 and 270 ia worse.
The current will be dependant on the circuit resistance.
Please go and learn some basic electricity before you make foolish
statements. :-?
John, why don't you quit lying to these people and admit that the amount of
wattage does have a bearing on the risk of electrocution?
(actually you admitted that when you said voltage above 50 is dangerous - and
even that is off - voltage above 5mv is considered dangerous - but keep
learning - that's good of you)
Could please explain wehich wattage you consider dangerous?
What ever over 5mv you have coming into an interface.
In ANY kind of electrical situation over 5mvac or dc, you have to think "path back", "path back", "path back". You learn that in the third year of electrical school (which is grounding).
no matter which voltage you chose the available wattage on agrid
connected line is more than you can measure, be it at 120 volts or 277
or 415 or 33 kv the wattage available is near enough for all intents
and purposes infinate. :-?
No its not, because its limited to measurement within an hour. That's why you say Kilowatt Hour.
power (watts) = current (amps) x potential difference (volts) or
P=IE (if you went to electrical school)
Lets say service is residential 2 phase (of 500kcm) to main panel (I guess you have a 60 amp breaker if you are familiar with the industry). That's 240v. You've got all neutral wire connected to the main panel BOX.
You use number 8 wire to the oven. You use 12/3 MC (or 10/3 MC if you are expensive) all armored everywhere else, to increase potential to all branches and roughed-in high voltage device rings.
where did you measure 5 mv? :-?
Where ever it is measured on the property MINUS VAR. Because that's resistance of volt amps.
Anything below 5 millivolts is not harmful to persons/property (including VARs). Its in anyNEC.
In other words, the more metal there is between that 5mv+ and the main panel's box, itself the more potential to a path back (which means less potential for a live person to get in the way)