What is the most violated section of the NEC?
110.3(B) Installation and Use. Listed or labeled equipment
shall be installed and used in accordance with any instructions
included in the listing or labeling.
Grounded and equipment grounding conductors sizes 6 and smaller are required to be continuous in color white or green. Most contractors install sizes 6 and 8 in black insulation and tape white or green, which is a violation of Section 200.6(A) and Section 250.119. However, this seems to be generally accepted with a nod and a wink in the inspection community. Of course, not every inspector or contractor accepts this, but many do.
How about 408.4(A) in reference to Panelboards:
"Every circuit and circuit modification shall be legibly identified as to its clear, evident, and specific purpose or use. The identification shall include an approved degree of detail that allows each circuit to be distinguished from all others."
Typical plancheck comment: One or more circuit names are used more than once. Identification of all circuits originating in panelboards must be sufficient to identify each circuit separately from all others. Either specific geographical description, unique names appearing on equipment, or otherwise clear and unmistakable descriptions are needed for required circuit identification.
Provide circuit names on all schedules that are unique and readily identify the equipment or area served by that circuit. Offices or rooms that are labeled by individual’s name (“Sam’s office”) or by a vague (“Big Projects room”) are not acceptable. These are transient occupancies.
Repeated references (“furniture”, “lights”, “exhibit” “office”, “lathe”, or “mill”) are also not acceptable. These are non-specific descriptions.
When multiple iterations of similar equipment are the case, provide specific instructions for permanent labeling of equipment to match the circuit naming convention. Method, materials and text. This identification must be in a prominent location and not concealed.
This required identification may be problematic considering how the circuits are named at this point. Perhaps a solution that would post a permanent, protected branch circuit physical map to clarify this for future users? Posted at each electrical panelboard as it applies to that equipment. That sort of mitigation might be possible to satisfy the intent of this rule with an equally safe alternate without requiring a unique naming convention. See the Code, Sec. 408.4 for more information.
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