ASTTBC RFPT — Emergency Lighting (EM) · Question
When inspecting nickel-cadmium (Ni-Cd) batteries in an emergency lighting unit, which of the following is a physical sign of 'thermal runaway' or excessive charging temperature?
Thermal runaway in sealed Ni-Cd batteries often leads to overheating, causing the plastic casing to soften, bulge, or leak due to internal pressure and heat.
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Question: When inspecting nickel-cadmium (Ni-Cd) batteries in an emergency lighting unit, which of the following is a physical sign of 'thermal runaway' or excessive charging temperature?
Answer options: ✅ Distorted or bulging battery casing
- Blue crystal formation on terminals
- Light brown electrolyte discoloration
- Increased specific gravity in one cell
Correct answer: Distorted or bulging battery casing
Explanation: Thermal runaway in sealed Ni-Cd batteries often leads to overheating, causing the plastic casing to soften, bulge, or leak due to internal pressure and heat.
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- When performing a monthly inspection of a unit equipment for emergency lighting, what is the minimum duration
- According to CSA C282, what is the required minimum frequency for performing a full-load rated test on an emer
- Under CAN/ULC-S572, photoluminescent exit signs must be tested for visibility by ensuring they are exposed to
- Per the BC Fire Code and CSA C282, how often must the fuel tank of a standby generator be inspected for the pr
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