How to Bond Neutral and Ground With 2023 NEC Code Book and Handbook

hi this is Bill from Sparky channel here are three enclosures from a scene from my video about the ideal national championship finals from Nashville there has been quite a bit of discussion about which of the three enclosure or enclosures is where the grounded conductor and the equipment grounding conductor are bonded in plain English in which enclosure are the neutral and the ground bonded together and in which enclosure or enclosures are the neutral and ground kept separate first before I crack open the code book I'll identify the three enclosures this one is a mill Bank made in the USA by the way exterior four terminal small closing plate 200 amp main breaker in plain English that means that this is a meter enclosure service entrance cables can enter it either from the top or from the bottom there is a main breaker right here with which the fire department can open this little door and shut off the power to the house this is a Siemens 200 amp 30 space main lug indoor load center with copper bus main lug only load centers are typically applied Downstream of a main circuit breaker panel and they can be used as a sub panel for main lug only load centers the incoming cables are terminated on the line side of the lugs that are attached directly to the bus no main or current device exists within a main lug only load center from now on I'll call this panel the mlo which stands for main log only the mlo has dual neutral bars and two ground bars the neutral bars and the ground bars are separate unless this green bonding screw is screwed all the way in my suggestion is that if you're not going to use this green Screw As a bonding screw remove it that way it won't get accidentally screwed in the model comes with the green body screw only partly screwed in so in this case the neutrals and the grounds are still separate even though there is a green bonding screw in place but not screwed in this enclosure is a Kohler automatic transfer switch its function is to keep power flowing to the mlo even if the power from the utility is disrupted it's part of a package which includes a Kohler backup generator it has a separate Ground Bar and a separate neutral bar also I'd like to go over two definitions that you'll need to know before going to the code book and one is service disconnect so here's your service and this is your first disconnect right here so we would call that a service disconnect the other definition I want to go over it would be load side of the service disconnect here's the service disconnect and anything Downstream of that service disconnect is on the load side of the surface disconnect here we are at 2023 NEC article 250.244b and here we have a DOT which means that there has been a section deleted and we have a n which means that there is some new material so load side grounding connections a grounded conductor now remember a grounded conductor would refer to the neutral and ungrounded conductor would be a hot so a grounded conductor that's the neutral shall not be connected to normally non-current curing metal parts of equipment to equipment grounding conductor or conductors or be reconnected to ground on the low side of the service disconnecting means except as otherwise permitted in this article before I go to the next article I'd like to explain what a main bonding jumper is and the arrow is pointing to the main bonding Jumper in this system it connects the neutral bus to the equipment grounding conductor bus main bonding jumpers have to be unspliced and sometimes they are green screws that are screwed in that connect the ungrounded conductor to the equipment grounding conductor in our case the main bonding jumper is an unspliced strap here is 250.244c main bonding jumper for a grounded system and unspliced Main bonding jumper shall be used to connect the equipment grounding conductor or conductors and the service disconnect enclosure to the grounded conductor within the enclosure for each service disconnect in accordance with 250.28 my last item will be a note from the 2023 ADC handbook under 250.24 except under limited conditions 250.24 B prohibits connecting the grounded conductor of an electrical system to a grounding electrode or grounding electrode system anywhere on the load side of the service disconnecting means so Within These two enclosures the grounded conductor must never be allowed to touch the enclosure or the equipment grounding conductor now we're ready to answer the original question in this enclosure the grounded conductor must be bonded with the equipment grounding conductor and the enclosure itself and in these two enclosures the grounded conductor must never touch the equipment grounding conductor or the enclosure I'll put links in my video description for related Sparky Channel videos such as what is the difference between an EGC and a gec and a video about different kinds of main bonding jumpers I hope you got that right and I hope that even if you are a pro that it was a good brush up for you thanks I hope this video was helpful [Music]

Channel: Sparky Channel

Views: 25,060

Keywords: Sparky Channel, Sparky, electrical, electrical tools, electrician, NEC 334.30 (B), 2020 NEC, NEC, new codes, electrical codes, 2020 NEC code book, 2020 NEC Handbook, NEC handbook, 334.30, National Electrical Code, Electrical Code, NFPA 70, National Electrical Code (NEC) Handbook, DEWALT DCN701D1, DeWalt cable stapler, cable, NEC 330.30, NEC 330.30 (D), shaded text, code changes, 314.16 B 2, box fill, NEC 314.16, Marked Controlled Receptacles, NEC 406.3(E), Leviton 16252-1PW

Id: 8nXEyMN3jHw

Length: 7min 7sec (427 seconds)

Published: Sat May 20 2023