grounding a subpanel at a separate building

Published by on November 13, 2020

The equipment grounding conductor shall be used for grounding or bonding of equipment, structures, or frames required Watch for that one. as erics37 stated section 250.32 is in direct conflict with your inspector's paperwork. In this case, the grounds and neutrals have to be connected together. I don't know how that plays out. I was assimilated by the Borg and all I got was this stupid t-shirt. Any installed grounded conductor shall not be connected to the equipment grounding conductor or to the grounding electrode(s). Author: Reuben Saltzman, Structure Tech Home Inspections, Monday - Friday: 8 am - 5 pm | Saturday & Sunday: 10 am - 3pm, Minnesota Home Inspection Website Design by One Wheel Marketing, bathtub flood, bathtub overflow, home inspection fail, home inspection fail files, air exchanger, erv, HRV, Radon, radon test, 2009 article in the ASHI Reporter on subpanels, blog post and video on bonding grounds and neutrals together at subpanels. Just currious what municipality is he representing? Think of your refrigerator. For years inspectors have required different grounding methods depending on their personal preference. Do I need to drive a ground rod and install a grounding bar to subpanel? I know the code and I have always ran grounds to sub panels. The first was with a four-wire feed; two hots, a neutral, and a ground. Grounding for a Sub Panel Located in the Same Building A second panel or sub panel should have the neutral and ground terminals or bars isolated from each other, this is why the main circuit feed to the sub panel must have 4 wires, with a dedicated insulated wire for the neutral and a separate … I have a out building I wired. If the new grounding electrode system consists solely of … From: openzgate@yahoo ... in order to get around this I could wire this subpanel bonding the ground to the neutral but NOT connecting the ground wire back to the main(i.e., wire this sub like a main 3-wire feed from the utility). No water pipe between building, no separate egc run, conduit is egc. 2005 NEC article 250.50, "Grounding Electrode System. Depending on what you are trying to power with the subpanel, you might need to upgrade your capacity from a 100A main panel. Thanks. Subpanel serves 2, 20A circuits. Bottom line is that if this AHJ thinks he's a code expert, he needs to tell you what code cycle he's enforcing, and whether it is amended. Prior to the 2008 code cycle that would have been perfectly code compliant but since the 2008 cycle each separate building or structure must have an EGC and must have a grounding electrode system which could be as simple as a concrete encased electrode in the form of bonded reinforcing steel in the foundation of the building or driven rods. The current inspector states separate building=separate ground systems=separate ground rods and no ground wire from main service. Electrical grounding or “Grounding” originally began as a safety measure used to help prevent people from accidentally coming in contact with electrical hazards. Electricians handle grounding varyingly. If you don't bring in grounding with the feeder than you need a grounding rod at the outbuilding and the neutral and ground in the outbuilding subpanel do get bonded. by Michael Casey and Barry Stone. Grounds and neutrals were isolated to provide separate paths back to the panel. I was advised to keep the feeder ground and neutral separate at the shed, and do not bond the feeder ground to the metal panel in the shed. The neutral bus bar is not bonded to subpanel enclosure. Sub panel grounding at a different building I have 2 hots and a ground. This article will address many of those concerns and provide some clarity on this vital aspect of electrical safety. Up until the 2008 version of the National Electric Code, there were two ways to wire a subpanel. The difficult thing for most people to grasp is why is the OK at the main service (the house only gets 3 wires from the power company, and a common neutral/grounding wire) and not a subpanels within the building. Ran 4 #2 al conductors. In, say 1975, it was legal to run a 3-wire feed to a remote building and bond the neutral same as a service, so long as no other continuous metallic paths existed between the two buildings. ... How To Wire An Electrical Sub Panel In A Detached Garage . A 3-wire feed (no bond) runs to subpanel at a secondary building ("B") with a grounding electrode that is bonded to neutral as well. Visit http://www.mikeholt.com/Code for NEC Training Products. Next, what' the deal with connecting grounds and neutrals together? Everyone feels differently and I noticed the discussion about the un-grounded panel earlier touching on this. Workshop neutral bus connects to house subpanel neutral bus, and workshop ground bus connects to house subpanel ground bus. If it is there, forget the exception, as per JP's post. The grounds and neutrals must be isolated. Some electricians do not run a ground to the sub panels and just pound ground rods. There are four reasons why this grounding method is not acceptable: 1) The primary purpose of a grounding rod is to provide lightning protection. The feeder is a single, 15A circuit from the subpanel. For a lengthy discussion on the definition of a subpanel, check out Bruce Barker's 2009 article in the ASHI Reporter on subpanels. LOCAL INSPECTOR FAILED JOB. No other connections between the buildings. Ask The Experts Dec 18, 2019 0 11 Add to Reading List The National Electrical Code article 250.32 covers this section, however, it is one of the longest and most complex sections in the entire grounding chapter, and it can be very confusing Suggestions welcomed. I can't remember ever thinking it was okay--but I'm younger than some. It depends on when it was installed and what else is going on. A grounding electrode is generally required at such buildings or structures, unless the building or structure is supplied by a single branch circuit … Would ANY neutral current from a load(s) on "B" flow to "B", cross the bonding jumper in "B", out the ground electrode, through the earth, to electrode "A", through the bond jumper on "A" to the neutral back to the power source? The National Electrical Code (NEC) has prohibited re-grounding the neutral after the service since the 1923 edition. Subpanel Grounding: Answers to Common Questions. Your inspectors really need to learn the Code. He knows code extremely well. Often times we install sub panels a few hundred feet from the service panel to feed these buildings. For a better experience, please enable JavaScript in your browser before proceeding. A bit too provocative for the average person... 4 wire has to go back to the main panel in my world. A friend tried to tell me this is not the case, because the ground wire is connected to the common bus in the main panel.

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