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  • Steve Ward
    Steve Ward replied to a topic in the forum Electrical Engineering:
    In addition to to the NEC definitions provided by Derek
    Grounding or Earthing is for:
    Protection against Induced current caused by lightning.
    Protection against High voltage conductors being connected to low voltage system conductors. (Lines falling...  more
  • Mohammad Finn
    Mohammad Finn replied to a topic in the forum Electrical Engineering:
    Thank you.
  • Derek Nelson
    Derek Nelson replied to a topic in the forum Electrical Engineering:
    Grounding:  a continuous and permanent conductive path to the earth of sufficiently low impedance such that any available fault current imposed on it will result in a limited voltage rise
    Bonding: a low impedance path obtained by permanently joining...  more
  • Mohammad Finn
    Mohammad Finn posted a topic in the forum Electrical Engineering:
  • Steve Ward
    Steve Ward replied to a topic in the forum Electrical Engineering:
    Carl thanks for taking the time to help. 
    That "chart" was used until a few years ago as our standard.  The internal temperature of our gear is considered to be 50 Degrees C.  I managed to get it corrected several years ago. 
    The SIS...  more
  • Steve Ward
    Steve Ward replied to a topic in the forum Electrical Engineering:
    Agree with Dennis that the breaker trip unit is 60A & the Frame size is 100A or the highest trip rating that breaker family has is 100A.
    A stands for Ampere
    T for Trip
    F for Frame
  • Carl Coulter
    Carl Coulter replied to a topic in the forum Electrical Engineering:
    A couple of minor suggestions for your example:
    1.  Pick a more normal building wire type, like thhn or xhhw.
    There are no 105C tables for 600V, because there are no devices rated for 105C (not exactly true but pretty close)
    For example, molded case...  more
  • Carl Coulter
    Carl Coulter replied to a topic in the forum Electrical Engineering:
    I wasn't ignoring you.  One of my clients insisted I pay attention to them for a few days.  AArggg. those pesky people with checkbooks think they can direct my time - Oh wait, they can

    "my understanding is that the "chart" was derived from...  more