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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Fortunately posted by Julien43 on June 8, 2007 at 16:53:03:
It sounds a lot like what EquiTech recommends for a technical groundI have one installed for the balanced power transformer that feeds my system
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Just so others are not confused the web site and information you supplied is for a separately derived grounded ac power system. The use of an isolation transformer where one leg of the secondary of the transformer is intentionally grounded to earth, thus making it an AC grounded system.
The method given by EquiTech closely matches what NEC 2005 code spells out for the required ac grounding electrode system and bonding wiring method. This wiring method would not satisfy NEC 2005 for a branch circuit fed from the main electrical system.
NEC 2005 clearly states the equipment grounding conductor shall terminate in the same panel as the branch circuit, the equipment grounding conductor is intended for. As stated many times the purpose of the equipment grounding conductor is to return any fault current with the least resistive path back to the source. NEC clearly spells out at the end of a branch circuit the resistance measured from the neutral conductor to the equipment grounding conductor shall not exceed one ohm, (if memory serves me right).... Just a note here, not all cases of fault current, will the current be high enough to trip open the over current device, breaker or fuse. Any fault current leakage will be carried back to the source by the equipment grounding conductor and be seen as a load by the source as well as the electric meter. The main reason for the equipment grounding conductor is safety.
The intent is to assure there will not be a difference of potential, voltage, between the metal cabinet the equipment grounding conductor is bonded to, and any other metal grounded object a person could come in contact with at the same time.
Jim
Edits: 06/09/07
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Follow Ups
- not the same - jea48 08:24:59 06/09/07 (1)
- Thanks for the clarification - Julien43 14:02:19 06/09/07 (0)
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