45 amp riser
- Thread starter nickelec
- Start date
- Status
- Location
- New Jersey
- Occupation
- Journeyman Electrician
What's the voltage? Is there a neutral?
I had to try to explain this to a guy at work years ago.
I had him put a rope around a pole, and pull each side one at a time like he is sawing the pole in half with the rope...
12 pounds of pull with one arm while the other arm is being pulled to the pole, then 12 pounds of pull with the opposite arm while the original arm is pulled to the pole doesn’t equal 24 pounds...
I had him put a rope around a pole, and pull each side one at a time like he is sawing the pole in half with the rope...
12 pounds of pull with one arm while the other arm is being pulled to the pole, then 12 pounds of pull with the opposite arm while the original arm is pulled to the pole doesn’t equal 24 pounds...
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
Wait until they tell you 225 amps is too small of a feed to a 42 circuit panel full of 20 amp breakers (840 amps worth) LOL!
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Not when I had a customer recently ask if we could use two 30a GFCI breakers to supply a new hot tub that called for a 60a GFCI-protected circuit. Umm, no. :happysad:
Bad enough that I had to install a separate box with the 60a GFCI, because the pool panel is a Sq-D QO box, and the QO260GFI breaker has no load neutral terminal.
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
On my hot tub, everything was 240 volt, so I did not need a load neutral, just the line neutral to power the breaker electronics. Probably the same way that one works.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
No, I wired it. The instructions were very clear about it. There was a neutral terminal and it had wires connected to it on the circuit board.
Granted the neutral load is a fraction of the required circuit, like most major loads like appliances, but when it's needed, it's needed.
kwired
Electron manager
- Location
- NE Nebraska
The hot/cold water and rope pull explanations are not 100% analogous to multiwire voltage source though
As mentioned OP can have two 45 amp loads at 120 volts or he can have one 45 amp load at 208 volts.
More confusion for those that don't know how this works - that is 10800 VA total ability at 120 volts but only 9360 at 208. gets more complex when there is combination of 120 and 208 volt loads.
As mentioned OP can have two 45 amp loads at 120 volts or he can have one 45 amp load at 208 volts.
More confusion for those that don't know how this works - that is 10800 VA total ability at 120 volts but only 9360 at 208. gets more complex when there is combination of 120 and 208 volt loads.
Remember who the audience is for this explanation.
kwired
Electron manager
- Location
- NE Nebraska
I know, still situations can come up that it don't quite work out as described.
Now bring in the third phase conductor and explain that with same analogy. you might come sort of close but not exactly the same as how electrical works.
How do you get phase angles out of a hydraulic system?
Don’t get technical...
if the people don’t get the water or rope explanations they are far from complex power formulas and explanations...
you got to crawl before you can walk
mikeames
Senior Member
- Location
- Gaithersburg MD
- Occupation
- Teacher - Master Electrician - 2017 NEC
I would also try to clarify that 2 - 45 amps fused in parallel would be 90.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Yes, but still at the original voltage.
- Status