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1-9 of 9 Results
  1. 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...
  2. General Electrical Discussion
    I have a customer that has installed a whole lot of new electrical equipment, mainly electric heating (floor heat, individual heating units in all bathrooms, another range, cooling, etc.) I spoke with her about upgrading the service and that is what she wants to do. But, I have a question. What...
  3. General Electrical Discussion
    I have a question that I'm not really sure I know the correct answer to. If you have dwelling unit calculation that comes out to, say 195 amps, can you still use 4/O aluminum? In 230.42 it states that the conductor shall have an ampacity not less than the maximum load to be served, but in...
  4. NEC Code Forum
    I have an existing service that is, 3 sets of 400 kcmil, now feeding a 1000 amp breaker. We will be intercepting the conductors between the pad mounted transformer and the 1000 amp breaker and installing an 800 amp fused disconnect then feeding an ATS and then refeeding the 1000amp MCP. The...
  5. General Electrical Discussion
    I am putting together an estimate for a house that is going to have a 320A service. - It's been a looooooonggg time since I have done one of these. I am using 310.15(B)(7) of the 2014 NEC and to me it looks like I need to use 400 kcmil aluminum or 300 kcmil copper. (I plan on downsizing the...
  6. General Electrical Discussion
    Hi All, I have a customer who wants a transfer panel put in and we plan on moving about 16 circuits to the new transfer panel, (which will include two or three 240V circuits.) These circuits will be traveling through conduit for just over 24 inches and I am thinking I will have to de-rate each...
  7. Residential Electrical Forum
    Ok, so I know most people don't care when the lights dim when high draw appliances kick on, but I do. I'm wondering if I can get this worked out by installing capacitor on high draw circuits. I only have a 100amp single phase service, which is more than enough for my little ranch style 1300ft2...
  8. NEC Code Forum
    Can someone please explain the difference between tables 310.16 and 310.17? I've been able to determine, through web search, that 310.16 applies to services and feeders while 310.17 pertains more to branch circuits but I could really use a few examples on how to apply these 2 tables. Thanks
  9. Canadian Electrical Forum
    CEC 4-004 (1) a For determining the ampacity of a conductor in free air .... what locations would be considered as free air? ..... besides the obvious! I asked an inspector in BC and he said that if the conductor is not in a conduit or wireway it would be considered free air. SO, the conductors...
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