Today As An Electrician: 480 Volt 3 Phase Transformer

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[illestofdemall]

That's solid and not stranded? Looks stranded when you showed the plug end. I can see it says 3/O on that yellow wire on the bottom left, so it looks to be 3 ought. Never heard of solid wire that thick.

[AmericanWireman]

I've come to enjoy watching your videos, but never forget to bond the transformer. Tie the neutral from X0 to the ground bar.

[migimnasiocasero]

Why didn’t you use double lugs to connect XO to the ground ? I think you missed it 🤔

[jaredkilgore]

Looking at the transformer connections, I would assume the system bonding jumper and grounding electrode conductor is going to be installed at the panel the transformer feeds? I'm used to doing it all in the transformer and isolating the neutral after the transformer. I've noticed over the years that guys that come from residential into commercial, are used to having the bonding jumper and grounding electrode conductor in the panel which means in the transformer, the neutral would be completely isolated. Either way is fine, I just prefer to do all the Neutral grounding and bonding in the transformer

[crisritter]

You need to bond your neutral and need bond bushings on your greenfield connectors.

[l.p.amador]

@ 1:14--1:20. He said, "Out here they call it "m-char" or something, so, there's really no NEC. You don't have to follow any rules or anything like that."

What is "m-char" and how does it supercede the NEC?

[ShaunPaget]

Don't forget to loosen the mounting bolts. They're tightened for transport. Loosen them to decompress the rubber blocks.

[J_Trask]

Hey where is your system bonding jumper here between the ground bar and XO?

EDIT: oh nvm. I just saw you’ve got the neutral and ground bonded in the panel fed by the transformer.

[jaredkilgore]

"Suicide ends" is what we always called those cord and plug connections, either pin and sleeve like the one shown or just 120 cord caps where the male-end is energized. Also I've never seen a dry type transformer used in a building to feed 120 208 panel boards where it was a Wye primary and secondary. Usually it's always a Delta primary and wye secondary. I live in Virginia Beach Virginia and the utility company out here for whatever reason on almost every service overhead, the transformer pots on three phase is wired Wye/Wye!?

[stevenreise]

'preciate teh insight! It's cool to have vids to "try and learn when you are trying to get into it"

[jongarrison]

The green screw is a main bonding jumper

[williamboydsmith]

OH my...I just stumbled on this video... On a delta primary/Wye secondary X0 should be grounded! The voltage on secondary will be skewed all over the place when one of the secondary phase is loaded. You needed a jumper from X0 to the grounding bar in the left corner and then that tied to earth ground!

[SantosReyes-cs]

How many amp is the breaker came to the transformer from 480 vlt side?

[MAZDAKPRODUCTION]

Question: Wondering if it is reasonable for a restaurant to call out for a 1200 amp panel. The restaurant is 7200 square feet with one kitchen and a full bar and an elevator with 2 HVac units. most contractors are telling me 400 amp panel will do.

[stevewalton]

Why is your transformer bolted directly to the concrete?

[jaredkilgore]

Looking at the connections, that is definitely a Delta/Wye transformer. My question is, on the transformer wiring diagram and nameplate, does it show the high voltage or 480 side connected in a Delta or a Wye? It could have gotten ordered as a step up transformer where you would feed a primary Delta configuration with a 208 volt, 3- wire circuit and have a 4- wire Wye 480/277 volt secondary serving the load. Conversely and typically, If it's a 480 to 120/208 step-down configuration, then the 480 would hook to the H terminals (and making sure the pre-installed black insulated tap conductors coming off the "H" terminal bus all go to the same number tap on its respective coil) and the H terminals would be the delta triangle configuration. The 120/208 conductors would terminate to the "X" terminals configured in a "Y" star connection. So to sum it up with a dry-type Delta/Wye transformer, where used for step up or step down purposes, you need to know which side needs the neutral, is it 480/277 volts (needs the neutral for the load) and you're feeding it with a 208 volt- 3 phase circuit wired in a Delta? Or is it 120/208 volts (needs the neutral for the load) and you're feeding it with a 480 volt- 3 phase circuit wired in a Delta? Could be either way- 480/277 Y secondary 208∆ primary or 208/120Y secondary 480∆ primary.

[virtualtreadmillwalknature]

Good information. Thanks for sharing!!

[thechivas]

Doesn’t it need grounding bushing and a plastic bushing? 😬

[Dezmond_Roman]

Does the Transformer taps come pre-installed?

[MrListon]

You caused a parallel path with bonding in panel