🔍 Key Concepts

• Intrinsically safe / explosion-proof equipment requirements in cargo and petroleum tanks • Differences between battery-powered self-contained lights and corded portable lights • Why eliminating sparks and faulty wiring is critical in flammable vapor spaces

💭 Think About

• If flammable vapors may be present in a petroleum product tank, what type of light would minimize the risk of a spark from wiring or a damaged cord? • If a compartment is truly certified gas-free, would special explosion-proof construction still be mandatory for every light, or does that change what is allowed? • Think about whether regulations completely ban portable electric equipment in these spaces, or allow it under very specific construction and power-source conditions.

✅ Before You Answer

• Check which options specifically mention explosion-proof AND how the light is powered (battery vs. corded line). • Consider whether having a ground wire on a cord inside a tank is actually safer than having no cord at all in a flammable vapor space. • Verify from regulations whether portable electric lights in petroleum product tanks must be specially constructed (explosion-proof / intrinsically safe) rather than being banned outright.