Voltage, Phase, and What??? Explaining Electrical Stuff

[@theelectricaldepartment]

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[@GABSPACE]

Underrated. I do have a question that I could easily look up, but since you asked... maybe explain what a phase physically means. Us non-electrical engineers don't understand stuff we can't see.

[@marymoarab]

You are amazing 👏🏻 Thank you 🙏🏻 Your channel is my favourite, since there is no channel with these useful content for an electrical designer on youtube

[@theelectricaldepartment]

I'm so glad you found my channel useful! I've struggled for years to try and learn how or why I do certain things at work, but as you said, resources are hard to come by on KZbin.

[@blonske]

Excellent!

[@mep_guy]

Wow! You're by far the best Revit MEP Teacher I've come across on KZbin (and I watch a lot of videos!). I'm looking to do some Revit MEP Collaboration Stuff in the near future. Wondering if this would be something you're interested in. Great Content! Keep up the good work!

[@theelectricaldepartment]

Thank you! Yea I think at some point it would be great to open up to colabs and exploring other topics in MEP. Let's get in touch!

[@mep_guy]

@@theelectricaldepartment Did I send you my contact info? I can't remember if I did or not. I was working on getting my website email set up.

[@kennbeary7044]

I can't thank you enough! Starting a new career soon and needed this review 🙃

[@theelectricaldepartment]

That’s awesome! Wishing you the best of luck!

[@deonappadoo2267]

Great video! One thing you could have also included was the center tapped Delta configuration. So in the center tapped delta, you could get your line/phase voltages of 240V and also get your 120V from two phases to the center tapped (neutral) and 208V from the wild leg to center tapped (neutral)

[@theelectricaldepartment]

oh yea I did come across that in a forum a while back, is this the 240 delta that actually uses 3 transformers? but only one center tapped phase so you still have that high leg. But the benefit is a balanced 3 phase load. I haven't actually designed around that before so didn't want to bring in something I wasn't familiar with. Great topic though!

[@deonappadoo2267]

@@theelectricaldepartment Yes it is!

[@larryweissenburger]

Anything on voltage Definitions ?

[@andychen882]

Amazing Video! I cant wait to finish your other videos. Question 1) At 6:16 and 7:11, We have the exact same wye distribution circuit, but why is one (208/120) and the other (480/277) Question 2) At 17:03, I noticed that the larger number is always on the left side, why is that? Can it be written as 120/240 split? Question 3) At 15:55, I noticed its either wye/delta; is this for the premier side or secondary side? What happens if we want to set up a delta to delta connection or wye to wye connections?

[@theelectricaldepartment]

Hey Andy! Thanks for watching! Here’s some quick fire answers: 1) different windings on the transformer can produce different voltages on the secondary side. You can transform a voltage to any other voltage by changing the number of turns on either the primary or secondary side. 2) I was always taught to list the phase to phase voltage first. I have seen it listed the other way around but I had a few senior engineers slap my wrist when I did it that way. Apparently code book list voltage as phase to phase / phase to neutral. 3) this is always secondary distribution. So if you’re transformed only puts out delta, you can only make a delta connection if you have a 3 phase load. If you get wye out of your transformer, you can connect to wye or delta for a 3 phase load. The primary side of the transformer typically takes a delta connection, but you can hook that up to a wye source just fine.

[@albduke]

Do you think it's better to run a window air conditioner on 240 you can use smaller wire, not worry about voltage drop?

[@theelectricaldepartment]

If its a massive 18,000 BTU through wall AC unit that needs a 30A 120V receptacle, yea 240V might be worth the trouble. As you mentioned, 240V requires less current (assuming constant load), thus smaller wires and less voltage drop. It also balances the load better since it uses both legs of the panel. However, 240V is not a typical outlet that you would have in each room of a house, and it takes up 2 poles in a panel that's typically 30-42 poles, so you lose space fast if you install multiple outlets. If the load on the AC can be supported by a single pole 120V 20A circuit, then its more practical to keep it at 120V.

[@albduke]

@@theelectricaldepartment there are multi-voltage units you can get. I just don't like running window units on 120 volts