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1-20 of 54 Results
  1. Canadian Electrical Forum
    How can we have high voltage as well as low current? Hi - I've been trying to grapple with this conceptually lately and have been finding it a bit confusing. I feel like I'm missing something when it comes to how high voltage power lines work. I feel I need to give a significant amount of...
  2. General Electrical Discussion
    Hello, I am looking for some advice on the general direction I should go with my Bitcoin mine. I will not be the engineer or electrician responsible for the nitty gritty details, but I would like some advice on the overall design so I can work alongside those responsible for the details and...
  3. NEC Code Forum
    Building system is 3 phase 120/208v. A new 480V air handler motor was supplied for updated HVAC system. Engineer decided to use a 10KV step up transformer to feed it. No neutral is needed. Is bonding XO required? If so can I bond to EGC or will it need to be tied into GEC?
  4. Residential Electrical Forum
    I own a home baking business and have acquired a large deck oven that is 208 single phase. House wired for 240. Need a dropdown transformer to hook up. Spoke to several electricians saying that it can be done but the electricity draw from the transformer will be substantial and not worth it when...
  5. General Electrical Discussion
    Hi Everyone, I am working as a tech for a power solutions company. For the last two years the scope of my work consists of connecting power quality analyzers (such as the Hioki 3169 or Fluke) to the load side copper pads of the main distribution transformer. This 3 ph transformer is intended to...
  6. NEC Code Forum
    Hello, this is a question regarding the interpretation of the NEC article 450.3, with connection to 368.17 and 240.4. Here is the situation (in California): A 2000A busway (3ph+G) is to be connected to the secondary of a 1500kVA oil-filled transformer (12.47kV Delta/480V Y, Is~1809A). Two...
  7. Residential Electrical Forum
    Hi, I am a DIYer, have some electrical experience from flipping houses, and would like to think I am pretty good at picking things up. But I do have a question, or really a clarification that I need if I am thinking right on this project. We are adding a Nest Hello doorbell and the current...
  8. Canadian Electrical Forum
    Hi folks, I'm currently sizing the secondary feed for a 1000kva 13.8kV:600V transformer. The feed will be underground in 4" conduits. If someone could check my secondary cable sizing calculations, I'd be grateful! I am assuming copper conductors, rated for 75 deg C. My calculations are as...
  9. Canadian Electrical Forum
    I have a ground problem that I can't quite get my head around. I've installed a 50KVA 240 / 600V step up - step down system to get a 200A service into the back of a customers property. I don't have a lot of experience with transformers so I gave the local inspector a call to ask about grounding...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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.
  18. 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...
  19. 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...
  20. 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...
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