What is the key difference between a limited approach boundary and a restricted approach boundary as defined by NFPA70E?

The key difference between a limited approach boundary and a restricted approach boundary, as defined by NFPA 70E, primarily revolves around the types of personnel allowed in proximity to electrical hazards.

In the case of a limited approach boundary, it permits access to briefed and trained personnel who are made aware of the potential hazards. However, this type of access does not necessarily require those personnel to wear insulating gear as long as they maintain a safe distance from live conductors or equipment under specific conditions.

On the other hand, a restricted approach boundary is more stringent, allowing access only to personnel who are insulated and properly protected against hazardous electrical conditions. This means that only those individuals who are specifically qualified and equipped to work on or near live parts can enter the restricted area, thereby significantly reducing the risk of electrical shock or other hazards.

Understanding these distinctions helps in the correct application of safety boundaries in electrical work, ensuring that personnel are safeguarded according to their level of training and the potential risks present.