Anyone have American electric questions?

[1capybara]

Everyone on this forum has been great in answering all my 17th ed questions,
pls lmk if u have any NEC [American electric] questions, I will be happy to answer

 

[1capybara]

i doubt that microwave is spec at 120w, maybe 1200w?

 

[qualityman]

Hi I have a heater that I need help with.
It is 3 phase 240/208 volts with 3 elements connected in delta. The nameplate is as follows:
watts: 9000. voltage: 240/208. amps: 21.7/25. phase: 3.
Obviously this is american and I want to use it in the uk. I was thinking of using a 380/230 4 wire supply and connecting the elements in star and connecting the neutral to the star point. Is this correct?
if so what output will I get ie Watts?
Any help would be greatly appreciated.
Conor

 

[1capybara]

im unsure of this, it PROBABLY will work but
I cant guarantee it and please write back and let us know how this works. fwiw, I would ground ["earth] the frame of the heater with a 5th wire.

 

[1capybara]

After having just come back from my holiday in florida, a couple of things i wondered if you could help me with .

1. I have noticed that you do not seem to use anything but conduit for commercial installations, the only time i saw trunking used was in disney with lights on it and in small pieces below panels top common up conduit runs. Has nobody thought of introducing trunking to the states as it would seem to be a much quicker way of doing things. instead of 20 runs of tubing you could have one run of trunking???

Well, doesnt 17th ed require you to de-rate the ampacity of the wires used if there is more than 3 current carrying conductors? In the NEC if you have - for ex. - 10 wires in a raceway [conduit or trunking] the ampacity of the wires is de-rated 50%.

2. Why dont they like putting 2 way switching systems in hotels/villas, the amount of times i switched the bedroom lamp on at the door switch then off at the lamp and then come the next night go to turn it on and its not going to come on as its off at the Lamp. Stumble across the room to find the lamp and turn it on there. Then repeat every night till I leave .
Nick

single pole switch $1 or $2, two way switch $5-8 each.

 

[johnboy6083]

Well, doesnt 17th ed require you to de-rate the ampacity of the wires used if there is more than 3 current carrying conductors? In the NEC if you have - for ex. - 10 wires in a raceway [conduit or trunking] the ampacity of the wires is de-rated 50%.

single pole switch $1 or $2, two way switch $5-8 each.

we do have to derate conductors for grouping as we call it, but in this country the decrease in the labour cost of using trunking over conduit, will often outweigh the copper saved.