When is a permit-required confined space relevant to electrical work, and what additional controls apply?

• A. When there is any open space that may be used for storage during electrical work.
• B. Only when the space is used for large equipment.
• C. Only when the space contains a hazard due to ventilation.
• D. When electrical work occurs inside a permit-required confined space due to restricted entry, potential hazards (gas, oxygen deficiency), and the need for continuous monitoring and rescue readiness.

Answer: (D)

Entering a permit-required confined space during electrical work is relevant because the space has restricted entry and may harbor hazardous conditions, such as a potentially dangerous atmosphere or oxygen deficiency. In this situation, simply doing the work as if it were a normal space isn’t safe, so extra controls are required.

The key controls focus on creating a safe and auditable plan before and during entry. You need an entry permit that authorizes the work and specifies the safety measures in place. Atmospheric testing is required before entry and continuous monitoring during the work to detect oxygen levels and the presence of flammable or toxic gases. If the atmosphere isn’t safe, ventilation is used to improve it and maintain safe conditions. Energy sources must be isolated to prevent unexpected energization (lockout/tagout) so equipment won’t start or release energy while someone is inside. A trained attendant or standby person needs to be present, and a rescue plan with appropriate equipment must be ready in case someone is timeout or incapacitated.

These controls are necessary because restricted entry and hazardous atmospheres create greater risk, and continuous monitoring and rescue readiness ensure any changes can be quickly addressed and the worker can be safely withdrawn.