Today As An Electrician: 480 Volt 3 Phase Transformer
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- Опубликовано: 15 мар 2021
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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.
its stranded if i said solid i made a mistake. its just super stiff
@@DailyElectrician Yeah you said solid. I was like holy crap, that would be crazy. You never know, though. I thought maybe it was just something I have never heard of. Lol
@@DailyElectrician Did you use anything to help you bend it, like a 2x4 or something?
nope just me lol
@@DailyElectrician I hope you had a good breakfast. Lol
I've come to enjoy watching your videos, but never forget to bond the transformer. Tie the neutral from X0 to the ground bar.
Bonding at the transformer is not required. You are allowed to bond the neutral at the main disconnect enclosure, which was the panel in this installation. Some do it in the transformer and some do it in the disconnect. Either method is acceptable.
'preciate teh insight! It's cool to have vids to "try and learn when you are trying to get into it"
Why didn’t you use double lugs to connect XO to the ground ? I think you missed it 🤔
He didn’t miss it. They chose to bond neutral to ground inside the secondary disconnect (main panel) instead of inside the transformer. It’s acceptable to do so in either. But not both.
If so he will find out. Floating neutral 😐
You have to bond at the FIRST means of disconnect…? No?
"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!?
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
If done, what you're mentioning would be considered a supply side bonding jumper to the raceway. We (National Electrical Code, in United States) are not required to use them unless , in general, it's 250 Volts to ground or higher (so secondaries of dry type transformers with nominal voltages below 250 volts, i.e., 120/208Y, 120/240 single phase, 120/240∆, 240∆ corner grounded, 120 single phase, 240 single phase and ungrounded 240∆) and oversized, concentric or eccentric knockouts are encountered. If this were a service, then yes, a bonding bushing would be required, regardless of voltage unless the raceway connection was UL 467 listed which isn't always the case.
Great work man! ⚡👷🏻⚡
Thanks Bro! 🙏🏼
Good information. Thanks for sharing!!
Glad it was useful! :)
Don't forget to loosen the mounting bolts. They're tightened for transport. Loosen them to decompress the rubber blocks.
Just a qtr turn is what ive heard, good stuff commenting this.
The green screw is a main bonding jumper
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.
Transformers hum. You only connect 1-3 and your lower voltages. Transformers are preset at factory for delta or wye. Depending what you need. 120-240 or 120-208 .
Thats awesome dude
Thanks!
I have a Ac system that has a 480 to 240 resin encapsulated transformer. The unit has a 240 terminal block to connect 240v accessory’s. I have a 240v fan motor that is over amping. When I check across the 240 terminal block I get 249v. When I check each side to ground I get 140v and 288v. Is this my problem? Thanks.
Bond the transformer 🧐
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!
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.
when are you required to put a bonding bushing?
check the codebook 🤪
@ 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?
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.
Yea, what's going on here, whenever he showed the neutral on 1, is that a wye neutral so all transformer secondary negatives go there, cause if it's only between within 1 end, it's a delta secondary with center tap neutral for 120 v. Right?
@@ryanb1874 I think you may have the right idea IF it were a mid-grounded delta (3 coils, 3 phases, 4-wire, line to line is typically 240 volts, line to neutral/ground is 120 volts on 2 of 3 phases, 208 volts on the high-leg). Typically, the coil (1 of 3) between AØ & CØ has a center tap at the halfway point and is grounded and where the system neutral connects (just like the single phase coil that feeds your house that has 2 hots and 1 neutral that originates from a center-tap of the coil that's grounded). Thay way AØ & CØ voltages to the neutral or ground is 120 volts but BØ volts to neutral/ground is about 208 volts (BØ has to go through the BØ to CØ coil and parallel BØ to AØ coil and in series with 1/2 of the AØ to CØ coil (from both sides) to ground giving you the higher voltage called the "High-Leg" or as some older electricians call it, the "Wild-Leg", and per national electrical code, required to be identified and marked with the color Orange. This arrangement is called a Mid-Grounded Closed-Delta (Using 3 identical coils; same kVA rating, arranged like ∆. A Mid-Grounded Open-Delta is 2 coils; one significantly larger (called the "Lighting-Pot"), and one smaller coil (called the "Teaser-Pot" or "Kicker-Pot"). When hooked up, you get the same voltage measurements as the Mid-Grounded Closed-Delta but current and power wise it is extremely unbalanced and can only support a percentage or fraction of the load (about 87%; some would argue 58% but it's about 87% but needs to be able to handle the three phase load Plus the phase load to neutral for the "Lighting-Pot" sizing in kVA) that the Closed Delta could deliver of the same size overall.
Without the supporting math behind everything here, that's about as much as I know about mid-ground Delta transformers.
Come to find out, what's shown here in this video is a 480 volt, Delta, three phase, three wire primary to a 120/208 volt, Wye, three phase, four wire secondary. Probably feeds a main breaker panel board for lighting, appliances, receptacles etc..
I'll tell you the system that really screws people up is a Corner-Grounded Delta system where, typically it's CØ, is intentionally grounded in a 240 or 480 volt nominal Delta system with line to line loads only. After the service (you'll see three over current protection devices at the service only) with a system like this, all the equipment like panel boards will look like single phase installations where you have two hots and grounded conductor which is typically a neutral but in this case it's actually a phase conductor but since it's grounded it's required to meet the national electrical code requirements as any grounded conductor would so it looks just like a neutral bar. All the motors that are fed from a panel board downstream from the service will be filled with two pole breakers so you would have two hots from the two pole breaker, plus the grounded phase conductor and an equipment grounding conductor and you would hook up the motor like you would any typical three-phase motor except the grounded conductor is hooked up as one of the three phases and yes that grounded conductor must be marked/identified as white or gray etc. per NEC 200.6! If you take the other two phases to ground it's the line to line voltage so a ground fault is actually a short circuit on this system. The grounded phase conductor is of course zero volts measured to ground with your meter but if you're in a junction box and open it up and ground yourself to the load side of that grounded conductor after you broke that connection apart, you get 480 volts through you instead of 277 volts like a Wye system, right after you just checked it the ground and it said zero volts! Because the corner grounded Delta is a grounded ac system service, you're not required to have any ground fault indicators to help troubleshoot ground faults on the system like you are required to do with an ungrounded system.
If you have made it this far in reading this, God bless you! 🙏✌️👊
@@jaredkilgore7194 made it this far. Have no clue what it means lol
@@silent6898. That's where visual aids and instruction comes in really handy. Plus, I may not have articulated it but so well...lol
@@silent6898. hang in there...🤪⚡
No system bonding jumper on the transformer
Does the Transformer taps come pre-installed?
i forget if i put them in or not.
Usually, yes. Most offer 2 positions for 2.5% higher voltage and 4 positions for 2.5%-4% lower voltage.
Why is your transformer bolted directly to the concrete?
Lol what did you expect a Red Carpet?
Is it stepped down to 120/208?
yep
Good ole MSHAW. MINING world.... phew.
“I’ve never dealt with copper before.” Please explain that statement. You are an electrician, right?
Copper wire in a transformer, or much copper wire pulls at all.
I’ve never seen aluminum wire in a transformer lol
do NOT use a Bonding screw if you are using a Grounded(neutral Bus) and a separate grounding bar
he did not, will not pass
Hi can u teach me the 220v output
A phase to c phase
where is my grounded identified conductor, neutral not grounded to x0
I whoud run ground from 480 to x0
nice
You need to get some help son that's not a joke
nah im good
Not really convinced that you should be doing electrical install videos......
this isnt an install video
@@DailyElectrician, obviously. FMC OVER 6 feet, no bonding, 480v delta, 208v wye.....maybe loosen the shipping bolts to ease the noise.lmao
i do what i'm told, even if its against code. AHJ 🤘🏻
@@DailyElectrician you gotta be better then that
you obviously don't understand so I won't bother trying to convince you. have a good one
Does guy seems confused
Can that transformer could take in 220 three phase and give out three phase 480volts please let you know thanks
i have no idea sorry, just the installer