Which NEC section requires a readily accessible service disconnect for dwelling units?

Which NEC section requires a readily accessible service disconnect for dwelling units?

• A. NEC 210.8.
• B. NEC 230.70.
• C. NEC 250.4.
• D. NEC 300.5.

Answer: (B)

Having a readily accessible service disconnect means there is a clear, quick way to shut off power to the entire dwelling. This is crucial for safety in emergencies and during maintenance, so occupants or responders can de-energize all electrical circuits from one place. The NEC requires this specifically for dwelling units, and the section that mandates the readily accessible service disconnect is NEC 230.70. It tells you where the disconnect should be located so it can be reached without barriers, typically at an approved location either outside the building or inside near where the service conductors enter. In practice, this ensures a single, visible point to interrupt power to the whole house, which is essential for safe firefighting, rescue, or servicing the electrical system. Other options deal with different topics: 210.8 covers GFCI protection for outlets, 250.4 covers grounding and bonding, and 300.5 relates to routing conductors and installation rules—not the main means to disconnect service.

Having a readily accessible service disconnect means there is a clear, quick way to shut off power to the entire dwelling. This is crucial for safety in emergencies and during maintenance, so occupants or responders can de-energize all electrical circuits from one place.

The NEC requires this specifically for dwelling units, and the section that mandates the readily accessible service disconnect is NEC 230.70. It tells you where the disconnect should be located so it can be reached without barriers, typically at an approved location either outside the building or inside near where the service conductors enter.

In practice, this ensures a single, visible point to interrupt power to the whole house, which is essential for safe firefighting, rescue, or servicing the electrical system. Other options deal with different topics: 210.8 covers GFCI protection for outlets, 250.4 covers grounding and bonding, and 300.5 relates to routing conductors and installation rules—not the main means to disconnect service.