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transformer

  1. Basic Electrical Question

    Electrician Apprentice Forum
    Hi everyone, I am fairly new to the field and trying to figure out a simple fact. Quite often, I am working in multi-residential buildings. These buildings typically have a switchgear with a nominal line voltage value of 208v or 600v (Ontario, Canada). As many of you know, within the switchgear...
  2. 300KVA Transformer Current Draw With No Load

    General Electrical Discussion
    Hi all, I'm looking for some input. This is the situation; I have a customer who is getting astronomical power bills even during the covid stuff when the business was not open. I was called in to investigate it. Three phase 600v 400a main service entrance. The main disco feeds to a meter...
  3. Autotransformer Inquiry

    General Electrical Discussion
    Hi everyone, The other day I was making a few measurements on a step-up autotransformer. The transformer is rated 208v/230v on the primary side and 460v/480v on the secondary side. I was always taught that for step-up transformers the primary side is L.V and the secondary side is H.V. However...
  4. Delta Transformer to WYE without Center Tap

    General Electrical Discussion
    I have a 600v->240v 250kVA 3 wire delta transformer with no center tap. This is a great transformer for my use case but I'd really like to get a neutral so I can pull 120v without having to run a whole separate set of panels to do 208/120. As I mentioned, there is no center tap so I was...
  5. Double Tapping the Secondary of Transformer (Rules 26-256 3) and 14-100 c) and d))

    Canadian Electrical Forum
    Hello! I've been reading extensively on a design that is common on US installations but I can't find an equivalent Rule that gives proper guidance on the CEC. I'm on the design phase and want to double tap the secondary of a 3.5MVA, 44kV/600V TX to feed two separate buildings straight from the...
  6. Unknown transformer - help with identification

    General Electrical Discussion
    Hi, This is my first post so I apologize if I made an error. Buddy gave me mains transformer because he doesn't need it. I also don't need it and was thinking of selling it maybe. Problem is I don't know the manufacturer of the transformer so I don't what price to set. I was wondering...
  7. Auto Tx vs Iso Tx

    Canadian Electrical Forum
    Morning fellas, What are everyone's thoughts on autotransformers? The application that I have in mind is a 450kva 600-480 step down to feed a DB panel that will have feeds for an assortment of stand alone packaging equipment and well as a 200A control panel with PLC/VFD controlled motor loads...
  8. 110V air purifier with an adapter 100-240V

    General Electrical Discussion
    I purchased an air purifier printed 110V. It has a power adapter of 100-240V. Can I use the air purifier with a power supply of 220-240V? Is the adapter also a converter or transformer? I’m really confused.
  9. Transformer & Generator Dilemma

    Commercial Electrical Forum
    Hey all, We have a client that bought a 40kw 600 volt 3 phase generator for his property off grid (local poco wanted +/- $180 000 to run poles and lines into the property). Problem is, he wants to run his woodworking shop/business off this land. All his woodworking machines are 220-240 volts...
  10. Sizing Breaker for transformer and machine

    NEC Code Forum
    Hello, I am in need of some guidance. I have to get power to two machines that have a nameplate that is, 220v, 43KVA, 3 phase, 125a. I have 480v in the building so the manufacture recommended transformers I bought are, 75 KVA transformer, 480v to 240v, I have changed the taps to get about...
  11. Odd transformer question

    General Electrical Discussion
    I recently went to look at a project for a customer who is renovating what used to be a small saw mill into some kind of a small take out restaurant. Anyhow, he has 3 phase 480V DELTA existing on the property in an old disconnect. He picked up a transformer at some auction that is rather large...
  12. Problems with step up delta wye transformer

    Commercial Electrical Forum
    Hello all. New to the forum but have a question probably easily explained by the great members here. I wired a step up transformer for a new marble saw for a marble shop. 120/208Delta - 400/231Wye The saw is speeding up its RPMS and causing the saw to shutoff it self --randomly throughout the...
  13. Input power help

    Commercial Electrical Forum
    Hello everyone! I was hoping I could get some help here. I would like to thank you in advance! So, I have this situation in which the machine I am trying to hook up requires 380V Line to Line and 220V Line to Neutral. The building in which I am installing this machine only has 208V Wye. The...
  14. Bonding xo to enclosure canada

    Canadian Electrical Forum
    Hi, we just installed a 112 Kva transformer 600 V. delta primary to 480/277 V. Wye secondary to connect some (US 480 V) solar inverters through a 480/277 volt panel to the secondary of the xfmr and from the primary to the building’s 600 V. service. We ran a #6 grounding conductor back from XO...
  15. Step Down From 12000 Volts

    Industrial Electrical Forum
    My machinery has a range of 120 – 240 volts. I have to run quite a few of these. My input voltage from the utility company is 12000 Volts and I need to step it down to 208 Volts. What kind of transformer do you suggest? I want to run the machines on 208 volts so that my amperage is less. 1)...
  16. 150 KVA Transformer(Unused, older) Kansas

    Business, Marketing, and Sales
    I just started an account here. If this is against the rules please let me know. I work for a local county agency and we purchased a 150 KVA transformer a few years ago and we never used it. It was purchased to go along with a generator in case the city lost power we could have a mobile...
  17. Can SDGE require my customer to pay for transformer

    General Electrical Discussion
    I need to upgrade my customers 100 amp overhead service to a 225 amp underground service. SDGE tells me that existing overhead transformer cannot accommodate the upgrade of service and my customer will have to pay for a new transformer (placed in from of his property) in order to upgrade his...
  18. Sizing the grounded conductor by transformer

    NEC Code Forum
    From the 2008 NEC: 310.15 B 4 b - ... states that the neutral conductor carries the same current as the line to neutral loads. My understanding is that this means the grounded conductor (neutral) is sized the same as the ungrounded conductors. I also understand that this also holds true for...
  19. Cost effective wiring for a switch on an 850' run.

    Residential Electrical Forum
    I've been trying to figure out how to wire a switch to operate the lights at my front gate. I have constant power at the gate, which comes in on 260' of 12-2 copper from a sub panel. (I haven't laid the wire yet, so could possibly go up to 10-2 if you guys think it's needed.) My house is another...
  20. 2500amps 120v from 3phase 480v 800amp service

    Commercial Electrical Forum
    I do not do much work with 3phase 480v, besides wiring equipment to it; I am wondering if this is possible for the service we have it. My boss is looking at installing a 2500amp 120v service for a prototype project for a new design. I can't go into detail because he does not want it to leak...
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