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Recent content by Redskinsdb21

  1. Redskinsdb21

    Panel/Switchboard voltage matching

    I would need 5 wires from switchboard to panel as well correct?
  2. Redskinsdb21

    Panel/Switchboard voltage matching

    So, we are designing a 480/277 switchboard. I want to feed a 480/277 lighting panel with one breaker from the switchboard for lighting in the building. This is ok right? Then, I want to power the lighting circuits @ 277 V from lighting panel. Is 277 the line-to-neutral voltage in this case...
  3. Redskinsdb21

    Meter Date Showing larger peak current in one phase

    waross (Electrical)22 Oct 24 16:33 Is the meter showing the energization current of a transformer? One phase is often subject to DC offset and that may be almost as much as 2 times the other phase peaks. I looked and did not see anywhere the meter may be showing energization current of Xfmr...
  4. Redskinsdb21

    Meter Date Showing larger peak current in one phase

    bacon4life (Electrical)22 Oct 24 16:12 Do you have reason to think the loads are balanced across phases? Perhaps there is twice as much load connected to B phase? Do you think its possibly due to imbalanced loads? The value is approximately 50 Amp peak in phases A & C but 100 in phase B...
  5. Redskinsdb21

    Meter Date Showing larger peak current in one phase

    Hello All, I have a question. I have a meter that is showing the peak current in phase B to be double that of peak current phase A & C. Does anyone know what may cause this? In phase B its 190 Amps approximately while in A * C the peak was about 95.
  6. Redskinsdb21

    Use stranded or non stranded (soild cables) for power distribution cables?

    Use stranded or non stranded (soild cables) for power distribution cables? Also, use the same for ground cable?
  7. Redskinsdb21

    Anyone know requirements for sizing grounding cable on LV side of a power Xfmr?

    Anyone know requirements for sizing grounding cable on LV side of a power Xfmr?
  8. Redskinsdb21

    How many cables needed for a Xfmr secondary 216Y/125 Xfmr?

    I know how many power cables I need based on Xfmr size and LV cable I plan to use. My question is do I need a ground and neutral? My thinking is 216 is line to line voltage but the 125 would be line to neutral so I would need a neutral and a ground. Is this correct?
  9. Redskinsdb21

    What is meant as a way in a MEDIUM switch or switchgear?

    What does a way mean exactly? Does it mean for each direction power flows? If so, why 3 ways? 6 ways?
  10. Redskinsdb21

    Load Break Air Switch

    What do these terms mean in this type of switch? Load Break? Does that simply mean it can be operated under load? Air Switch? Does that mean that it doesnt have any special insulation such as SF6 etc.? Just operates in atmosphere?
  11. Redskinsdb21

    Ground cable size required for MV circuit

    waross (Electrical)22 Jan 24 23:41 Equipment grounding or bonding conductor apart from system grounding conductor. Different rules, different sizing. I think what you are saying to Equipment grounding is same as bonding conductor? and the system grounding conductor is what would be the ground...
  12. Redskinsdb21

    Ground cable size required for MV circuit

    dpc (Electrical)23 Jan 24 01:36 In the NEC, a grounded conductor carries load current (neutral) while an equipment grounding conductor normally carries no current. So in this case wouldn't the ground cable carry neutral current back to ground? and also carry current under fault conditions that...
  13. Redskinsdb21

    Ground cable size required for MV circuit

    Ground cable size required for MV circuit I am currently designing a power system to use 3 1/C 500 kcmil MV cables. I am doing a calculation to determine the size of conduit required as well as grounding cable size required. I found thread on forum listed here about grounding cable size...
  14. Redskinsdb21

    Sizing Cables for a Xfmr

    As with many things, the definition of over-current has changed over the years. But, cable ampacity, 125% of rated current. The protection setting, by code, depends on a number of factors: Transformer voltage, Transformer %impedance. Fuses, breakers, dual element fuses, Overload protection on...
  15. Redskinsdb21

    Sizing Cables for a Xfmr

    waross (Electrical)29 Dec 23 17:14 Conductor size is based on rated full load current. If there is a possibility that an ONAN transformer may be upgraded by the addition of fans, the AHJ may require the ONAFfull load current to be used. It comes down to the conductor size or ampacity must be...
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