What are the best practices for labeling circuits in a panelboard?

1 Choose a consistent format

The first step to label circuits in a panelboard is to choose a consistent format that is clear, concise, and informative. You can use alphanumeric codes, symbols, colors, or a combination of them, as long as you follow the NEC rules and avoid ambiguity or confusion. For example, you can use A1, A2, A3, etc. for the phases of a three-phase system, or L1, L2, L3 for the line conductors. You can also use abbreviations for common loads, such as LT for lighting, RC for receptacle, AC for air conditioning, and so on. Whatever format you choose, make sure you document it and keep it updated.

2 Use durable and legible labels

The second step to label circuits in a panelboard is to use durable and legible labels that can withstand environmental conditions and wear and tear. You can use pre-printed labels, engraved labels, or hand-written labels, as long as they are neat and readable. You should also use labels that are resistant to heat, moisture, dust, oil, and chemicals, and that are securely attached to the panelboard or the circuit breakers. Avoid using labels that can peel off, fade, or smudge over time.

5 Indicate the hazards and precautions

The fifth step to label circuits in a panelboard is to indicate the hazards and precautions associated with each circuit, as well as the general safety rules for working with electricity. You should use warning signs, labels, or stickers that comply with the NEC and the Occupational Safety and Health Administration (OSHA) standards, and that alert the workers and users of the potential risks of shock, arc flash, fire, or explosion. You should also include the personal protective equipment (PPE) required, the lockout/tagout procedures, and the emergency contacts.

7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?