- #1
Leyden
- 39
- 4
i'm trying to research what might be the difference in two electrical scenarios
scenario
same in both scenarios-
we have a 18"tall x 4"deep x 8" wide carbon steel box, this is mounted to a building and electrically bonded to the electrical system throughout the building and most of the rest of the conductive material in the building. in the middle of the box there is a 6awg solid copper wire bonded to the box and
scenario 1 variation-
the wire exits through a 1/4" diameter opening without touching the box where it exits
scenario 2 variation-
the wire exits the box in a connector that bonds the wire to the box where it exits
same in both scenarios-
the wire runs down to a grounding electrode in contact with earth
background on question-
-when a conductor is surrounded by ferrous material it creates a choke which impedes current flow on the conductor
-the solution used for this problem is bonding the conductor where it exits its surrounding ferrous material whether once or twice. this creates a parallel electrical path, using the enclosure as the dominant current path in this case
would anyone be able to help me with what the impedance might be on the conductor in both scenarios under lightning current (say around 100 million volts, 200KA, 10MHz)
obviously there are many variables that i have not given a value to, i am only looking for ballpark values and what you all think the differences may be
more background info on the question-
-the purpose of the wire is to connect the electrical system to Earth and stabilize the voltage to Earth when the system undergoes a surge
-the root of the question is, the less voltage gradients (even if only marginally less) throughout the system the less damage will be done to things, also the less time (even marginally and almost immeasurably less) the less damage and negative effects will be done by the lightning strike. so will eliminating the little choke help?
any good info, direction or thoughts are greatly appreciated, even if your not sure, although if your not sure please say so
thanks
scenario
same in both scenarios-
we have a 18"tall x 4"deep x 8" wide carbon steel box, this is mounted to a building and electrically bonded to the electrical system throughout the building and most of the rest of the conductive material in the building. in the middle of the box there is a 6awg solid copper wire bonded to the box and
scenario 1 variation-
the wire exits through a 1/4" diameter opening without touching the box where it exits
scenario 2 variation-
the wire exits the box in a connector that bonds the wire to the box where it exits
same in both scenarios-
the wire runs down to a grounding electrode in contact with earth
background on question-
-when a conductor is surrounded by ferrous material it creates a choke which impedes current flow on the conductor
-the solution used for this problem is bonding the conductor where it exits its surrounding ferrous material whether once or twice. this creates a parallel electrical path, using the enclosure as the dominant current path in this case
would anyone be able to help me with what the impedance might be on the conductor in both scenarios under lightning current (say around 100 million volts, 200KA, 10MHz)
obviously there are many variables that i have not given a value to, i am only looking for ballpark values and what you all think the differences may be
more background info on the question-
-the purpose of the wire is to connect the electrical system to Earth and stabilize the voltage to Earth when the system undergoes a surge
-the root of the question is, the less voltage gradients (even if only marginally less) throughout the system the less damage will be done to things, also the less time (even marginally and almost immeasurably less) the less damage and negative effects will be done by the lightning strike. so will eliminating the little choke help?
any good info, direction or thoughts are greatly appreciated, even if your not sure, although if your not sure please say so
thanks
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