Erico
Member
(besides 20 volts )
Last edited:
This just about sums it up(besides 20 volts )
Being that the steam generator would need to be sized at 120% I would say you got all this under controlQuestion:
Would I be correct in assuming I can use 10 gage copper wire........and what? a 30 amp. breaker?
both the black and white will be carrying current and have a difference in potential of 240 volts. Neither of these conductors (white/black) will be grounded or neutral.What's a two wire supply source? I'm used to white and black.
false tripped.
If there's no neutral to the load, why would you need a neutral off the GFCI to the neutral bus? Or is it supplied just in case it's a 3-wire circuit?
To power the GFCI circuitry.
Would you please take a minute and explain just what a "false trip" is?
Actually, it's a voltage-squared relationship, I think.Resistive devices such as water heaters lose capacity in direct relationship to the loss of voltage.
Resistive load... P=E*I but I=E/R, so P=E^2/R.
Or use the RMS voltage if it's an AC circuit with a resistive load. The possibilities are endless...also
P= I squared times R
BUT
of course this only holds true in prue resistive circuits with DC voltages.
For AC circuits we must also do a Power Factor calculation.
Could you give us the source for this information. In more than 29 years of experience in the field with GFCI devices I have never run into this except through conversations where no data was produced to back such information.Devices with motors, or more specifically compressors such as freezers and drinking fountains seem to cause GFCI's to trip randomly.
Under the 2008 code cycle this would mean that freezers can no longer be in unfinished basements, attached or detached garages or any remote (storage) buildings served electrically from another building.This is why a freezer ir freezer should NEVER be plugged into a GFCI. It can trip and without a temperature alarm the user will not know about it until the contents have thawed and spoiled.
Did you also check out the freezer to find the reason there was a difference between the two conductors?I had one customer who had it happen, but since the outlet was dead they just ran an extension cord to a working outlet. When I was there for a different problem, the situation came up and I told them it sounded like a GFCI problem, even though that outlet was not a GFCI one. After an extensive search, I found the tripped GFCI under a bench in their bathroom. They had not even known it was there.
Again this will no longer be allowed by the 2008 codeIt is also the reason that many receptacles for certain appliances are installed with a single device outlet without GFCI protection, so that an extension cord cannot be used in that outlet when the location would normally require a GFCI for the extension cord.
Not meaning to sound mean or anything but this is not a true statement. The 240 GFCI devices conform to the same standard as a 120 volt device. Both trip when there is a 5 milliamp difference between the two current carrying conductors.As far as 220/240 is concerned most devices will tolerate a 10% variation between the design voltage and the supplied voltage, without creating problems.
I wouldn’t totally agree with this statement either. The lower voltage does not mean that a water heater won’t heat water to the desired temperature it just means it will take it a few seconds longer to get the job done.Resistive devices such as water heaters lose capacity in direct relationship to the loss of voltage.
This is awkward, but...
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