# Poles

[Alwayslearningelec]

This panel schedule says 120/240 1 phase. It would only require a 1P breaker to feed it and not a 2P, correct? Asking because it says 3 Wire but I guess that is hot, neutral and ground

 

[infinity]

No 3-wire means H-H-N. It's 1Ø, 120/240. Circuits 1/3 and 5/7 are 2-pole CB's.

 

[Alwayslearningelec]

No 3-wire means H-H-N. It's 1Ø, 120/240. Circuits 1/3 and 5/7 are 2-pole CB's.

So the main feeder to the panel 1C needs to come from a 2 pole breaker...2 Hots? If so what would indicate that....3W??? The single phase part is what throws me.

 

[Little Bill]

So the main feeder to the panel 1C needs to come from a 2 pole breaker...2 Hots? If so what would indicate that....3W??? The single phase part is what throws me.

Single phase can be a 2-pole breaker if it is 240V, or 208V, etc. Single phase just means it's not 3ph. You have to look at the voltage to determine if it needs a single pole or 2-pole breaker. Example: 120V always is a single pole, 240V would be a 2-pole. If it takes two legs of a system, then it needs a 2-pole. 277V might be a little confusing as it comes from 480V, but is single ph and only needs a single pole breaker.

When you see 3 wires, or 4 wires, the ground is not included. So 3-wires would be 2 hots and a neutral, 4-wires would be 3 hots and neutral.

 

[LarryFine]

"Single phase" is not the same thing as a single phase (hot) wire.

 

[NEC Inspector]

Have you checked out these free videos? Very good for trying to get up to speed on the complex subject of electricity. I used these extensively when I was going from carpenter to inspector (not that long ago).

https://www.youtube.com/@ElectricianU/videos - Sometimes oversimplifies things, but better at explaining the more general points to help beginners. Also good for seeing how to actually wire a 3-way switch or taking one apart to see how it works. Much more of a hands-on teacher. His code knowledge/interpretations are more geared to how the jurisdictions he works in translate the code, so some of them are a little different from what would be a mainstream interpretation.

https://www.mikeholt.com/tv-safety.php - These videos go more in-depth. The electrical safety fundamentals series is very good. Heavy on theory. Code information is very reliable.

 

[infinity]

So the main feeder to the panel 1C needs to come from a 2 pole breaker...2 Hots? If so what would indicate that....3W??? The single phase part is what throws me.

Look at the details given in the notes:
Main Lug
125 Amp bus
120/240
1 Phase
3-Wire
This means that you have two hots and a neutral. The feeder to this panel would therefore require a 2-pole circuit breaker.

 

[jim dungar]

So the main feeder to the panel 1C needs to come from a 2 pole breaker...2 Hots? If so what would indicate that....3W??? The single phase part is what throws me.

Industry slang rears it ugly head.

Our industry uses the word Phase to describe many different things. context is everything, kind of like the George Carlin(?) comedy skit about the way we use the word 'sh**'.
The use of Phase to indicate a live/hot conductor is extremely problematic when we do not know its context. But for the most part: when describing voltage systems Phase usually means single-phase or three-phase, while when describing voltage measurements phase usually means a single hot conductor.

 

[Seven-Delta-FortyOne]

Very very very few sub panels are fed from a single pole breaker. You’d only have 120V, (or 277).

I only usually see them on off-grid grows where someone is running a trim shed or drying shed off a generator and they only need some lighting and maybe a receptacle for a dehum.

 

[Alwayslearningelec]

Have you checked out these free videos? Very good for trying to get up to speed on the complex subject of electricity. I used these extensively when I was going from carpenter to inspector (not that long ago).

https://www.youtube.com/@ElectricianU/videos - Sometimes oversimplifies things, but better at explaining the more general points to help beginners. Also good for seeing how to actually wire a 3-way switch or taking one apart to see how it works. Much more of a hands-on teacher. His code knowledge/interpretations are more geared to how the jurisdictions he works in translate the code, so some of them are a little different from what would be a mainstream interpretation.

https://www.mikeholt.com/tv-safety.php - These videos go more in-depth. The electrical safety fundamentals series is very good. Heavy on theory. Code information is very reliable.

Thank you

 

[Alwayslearningelec]

Look at the details given in the notes:
Main Lug
125 Amp bus
120/240
1 Phase
3-Wire
This means that you have two hots and a neutral. The feeder to this panel would therefore require a 2-pole circuit breaker.

Thanks

 

[Tulsa Electrician]

That panel schedule is
Not revenant to the post though. May be more revenant if applies to the voltage drop post.
Take a closer look at line load and line to neutral load.