Electrical isolation of a space shall include securing of all electrical equipment except which?

Electrical isolation of a space shall include securing of all electrical equipment except which?

• A. Ventilation
• B. Lighting
• C. Navigation equipment
• D. Communications gear

Answer: (A)

Electrical isolation is about removing energy sources and eliminating ignition risks inside a space you’ll enter for damage control. You de-energize and lock out all electrical equipment so there’s no shock hazard or arc ignition. The crucial exception is the ventilation system: it should stay running to control the atmosphere—diluting or removing hazardous gases and supplying breathable air for the crew. Without ventilation, hazardous atmospheres can develop even when all other electrical gear is isolated. Therefore, ventilation is not secured, while other electrical equipment such as lighting, navigation gear, and communications are secured to eliminate electrical hazards.

Electrical isolation is about removing energy sources and eliminating ignition risks inside a space you’ll enter for damage control. You de-energize and lock out all electrical equipment so there’s no shock hazard or arc ignition. The crucial exception is the ventilation system: it should stay running to control the atmosphere—diluting or removing hazardous gases and supplying breathable air for the crew. Without ventilation, hazardous atmospheres can develop even when all other electrical gear is isolated. Therefore, ventilation is not secured, while other electrical equipment such as lighting, navigation gear, and communications are secured to eliminate electrical hazards.