Unless the OP has a 3-phase system (unlikely), don't you mean "leg"?
Dedicated Circuits - Subpanel importance?
My system is no more. Sold everything. Starting from scratch. Thanks to you and seven months of experience I am doing the following, which is taking care of the number one component, the room:
- Treating. The full GIK order in October is starting to arrive.
- Running one or more dedicated circuits.
I am addressing #2 in this post. There are extensive discussions here and one can spend hours if not days trying to wring-out the critical details needed for a DIY solution. I have spent hours and there a few things I need to confirm before I proceed because I was unable to find definitive answers.
I am doing this myself. I do not want or need lectures on only having a licensed electrician do this work. I have been doing my own electrical work for many years and am very comfortable doing so.
- Does a subpanel help? Is it required? Subpanels are typically supplied from a breaker off of the main panel's bus, so I'm guessing there is no advantage in terms of SQ? Perhaps if I can independently ground the subpanel it might make a difference?
- Opening up my walls is not an option, so I need to use conduit. This may restrict the number of lines if the wire should not share the same conduit? If I am restricted to Romex 8 or 10,2 versus metal-clad, is it okay for two runs to occupy the same conduit?
- How much better is metal-clad? Is it required vs Romex? Will metal conduit accomplish the same result with Romex?
Answers to these questions will complete my plans and I will go forward at speed. Hopefully this discussion helps others as well even if it's to know what to have their electrician setup for them.
Thank you!
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- 68 posts total
@cleeds , I've learned about grounding code from forums such as this. But I've been wondering why can't a subpanel have it's own grounding rod as long as the main panel has a grounding rod? This is unclear to me because the subpanel ground is tied to the main panel grounding block. Is a grounding rod ever used on a subpanel?
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@lowrider57 said:
You can add a ground rod to a subpanel connected to the ground bar in the panel, BUT, an equipment equipment grounding conductor still must be ran with the feeder conductors and the equipment grounding conductor shall be terminated to the equipment ground bar in the main electrical panel as well connected to the ground bar in the subpanel. The purpose of an equipment grounding conductor is to provide a low impedance path for ground fault current to return to the source, the utility power transformer, through the service neutral conductor at the electrical service main electrical panel where all equipment grounding conductors are connected to. If the feeder equipment grounding conductor was lifted at one end the only path for ground fault current would be the earth driven ground rod for the subpanel... The earth is a poor conductor... The ground faulted circuit, be it a branch circuit fed from the subpanel, or a faulted feeder conductor, there would never be enough current to overload the breaker and cause it to trip open. The main purpose for a ground connection to earth is for lightning protection. I does absolutely nothing for improving the sound of an audio system. The earth does not possess some magical mystical power that sucks nasties form an audio system So forget adding an Auxiliary grounding Electrode to a subpanel that is located in the same building structure... Lightning loves them though... FWIW, in a separate detached building, structure where a subpanel is installed fed from a main panel ,say in a house, then by code an new grounding electrode system shall be established. An equipment grounding conductor ran with the feeder is still required, connected at both ends to the equipment ground bar.
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Understood. We discussed this when you advised me about replacing my meter box and outside line due to corrosion. If you remember, distortion and DC was entering my service panel. I think where I'm confused is from comments in threads about using an "independent" ground rod (or 2) from a subpanel or main panel. My take is that these ground rods are not bonded to the main panel. This doesn't sound kosher. Is there any reason to use multiple ground rods spread out in the backyard? Yes, I know earth doesn't possess any magical powers.
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- 68 posts total