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originally posted by: Flyingclaydisk
a reply to: butcherguy
Don't you mean 240 single phase (split phase) (not 208)? Typically, residential power is delivered to a residence as 240 (split) single phase. Meaning two hot legs of 120 VAC at 180 degrees out of phase with each other.
With 3 phase (let's say 208), each phase is rotated 120 degrees from the previous phase. Consequently, if you multiply 120 volts times the sq. root of 3 you get 208 volts, hence the phasing angle of each phase with respect to the others. Same for 480/277. So, if you have a 120 3 phase panel, each of the hot legs are 120 volts. To get a 120 volt circuit you tie one of the hot legs into the circuit via single pole circuit breaker in the panel. To get a 208 volt circuit you use a 2 pole breaker which attaches across two of the hot rails in the panel.
In a residential 240 volt system, both of the 120 phases are 180 degrees out from each other (hence the "split phase" terminology used in some areas). In this arrangement, a 2 pole breaker across both hot rails results in 240 volts which is typically used for ovens, heaters and dryers, etc. I honestly don't think I've ever encountered 208 volt split phase system.
originally posted by: Thenail
a reply to: randomtangentsrme
Wow you are an idiot. A first year apprentice electrician is way smarter than you . I’ve explained this 8 times and you’re not any closer to grasping it. I explained three phase but you don’t get it.
You have no working knowledge of electricity in any form.
Ill correct you one more time then after that I’ll assume you’re trolling because no one is this stupid. First year apprentices are smarter after two weeks of class
1- you can’t just tie the neutral to the ground , that’s the most idiotic thing I’ve ever heard , you bond it at the first point of disconnect .
2- you don’t need a neutral for 208, I just wired a 208 volt hand dryer in a bathroom . No neutral needed .
3- do you know what a generator does lol , it fires up when you lose power and runs your critical loads and turns back off after power is restored .
Why do my 3 phase rtus not need a neutral mostly anything 3 phase doesn’t need a neutral .
If you have a 120/208 panel than it’s obviously 3 phase . It’s pretty easy to tell because it has 3 hots. Black red blue . A 2 pole breaker is 2 hots 208 volts . Does hand dryer and heaters and stuff .it’s still 3 phase power but you’re using two legs only . If a piece of equipment is 3 phase then it probably takes 3 hots and a ground . Maybe a neutral but doubtful. Go watch some you tube videos or something
originally posted by: Thenail
a reply to: randomtangentsrme
This isn’t my thread lol . You insulted me. You have no knowledge of electricity. You insulted me and you have way less knowledge than a first year apprentice, which is a guy who just became an electrician that year . You don’t need a neutral to complete a circuit. You need a neutral to complete a 120 volt or 277 volt circuit . I just wired 3 ceiling mounted electric heaters , they each took 208 . I ran 3 wires out of the 3 phase panel to do it . Two 120 volt wires and a green grounding wire to get 208 volts . I used a two pole breaker to feed it . Nowhere is there a neutral . I just wired 10 roof top units off 480 . I didn’t need a neutral for any of them . That kind of blows your theory out of the water . Don’t you think ? Every house in America built between the 40s and 1990s had the dryer on two hots and a grounding wire . So their dryer would never complete a circuit ? Your stuff makes no sense and it basically doesn’t work . Like your theories . What in gods name is it about generators with you ? I think you don’t know anything about them . You just brought it up again but have no point whatsoever
If it has 2 hots and no neutral the hots probably draw the same because a neutral is just for an inbalanced load . You could probably buy a couple electrical books read them for a few years or maybe get an electrician job for 5 years and become a journeyman and then maybe you’ll make sense . I’m not trying to be a dick , I think it’s absolutely hilarious . It’s like me who has no knowledge of plumbing whatsoever, if I would start arguing with a master plumber about the mod5 basic plumbing crap he would of told me off 3 days ago . But here I am still trying to help you understand but I know now you either can’t or won’t .
originally posted by: Thenail
a reply to: randomtangentsrme
You were never a master electrician, you’re a liar . You don’t understand how electricity works . You think you need a neutral for 208 three phase . Most of the time it doesn’t . It’s definitely not always needed . You have the knowledge of a 1st year apprentice and you’re rude and when someone tells you you’re wrong you get butthurt and and like a baby . You can’t learn from reading something , are you that dumb or can’t admit you’re wrong . Both obviously . You don’t need a neutral , all the stuff I wired up , I just told you all the stuff that didn’t need a neutral . The rtus , the heaters . Has it been your job to wire up anything ever ? Hell no. You’d be fired after 4 hours at my job . You can’t wire anything . That’s why I’m telling you . Some stuff doesn’t need a neutral if it’s 3 phase , you know black red and blue or brown orange and yellow and a three pole breaker . If you can’t just accept that you’re too dumb to grasp it’s then it’s your problem . I’m done