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three phase

  1. 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...
  2. Commercial Electrical Forum
    I'm looking into installing a battery charger that was included with the purchase of a Army Surplus forklift. It is labeled to be set up for 480v 1ph. I always thought 480v 1ph was just using 2 of the 3 legs, but the charger is labeled L,N,G. What are they considering N? Maybe I'm just...
  3. General Electrical Discussion
    Can you wire a Single Phase 208 Volt Condenser in a Three Phase Panel? Will this effect any warranty?
  4. General Electrical Discussion
    I am working on an electric steam kettle. The element is a 6 wire element (three loops) that is 24kW three-phase 220v. There are two contactors and a low water switch, t-stat, and tilt switch. The kettle was converted from 480v by switching out the element, removing a transformer, and adding one...
  5. General Electrical Discussion
    Installing a big ass fan at our warehouse and was wondering if anyone out there has any previous experience or tips for me. I've been out of practice for about a year. My boss wants me to build, install, and wire two Basic 6 16' fans. I am planning on using 12/4 mc from the breaker to a...
  6. General Electrical Discussion
    I am an Alderman with a small Missouri city. Our largest employer in town has decided to expand. This expansion is going to require that the City double the size of our waste water treatment facility. During the planning phase for this expansion, our electric provider came to us and informed...
  7. NEC Code Forum
    One of the Mike Holt forums said that "dedicated circuit" is a trade term rather than a term defined in the NEC. I did not see this term in the index of my hardcopy NEC. That being said, I'm working on an Automatic DVD rental machine in a super market. This is a concession deal. The machine is...
  8. General Electrical Discussion
    Hello, I am trying to understand and interpret the cable nomenclature on the attached example of a single line diagram for a three phase power system. Any help is greatly appreciated. Am I correct in believing that the following is true or am I completely wrong and missing something (Such as...
  9. General Electrical Discussion
    This is a question that my boss gave me on Friday. I have not run into this before and could use some help getting started. Any thoughts? (It is based on an actual job we are doing. The job had already passed the way it was, but now a private inspector turned it down. The previous was...
  10. New Member Introductions
    Hey guys, new to the forum. Moving to Vancouver, BC on Friday! I have passed my Red Seal in Construction Electrician and will be challenging my Industrial paper later this year. I love my job and I need one in Van too! I have a youtube page showcasing some of my work in the UK. Check it out ;)...
  11. General Electrical Discussion
    My business has recently added several 208V 70 amp breakers and I now have the task of reading it every month. I am using a clamp meter and am not sure how I should be calculating the total amperage in order to correctly charge our client. Any help would be greatly appreciated. Thanks
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