Exam Question
State the precautions needed for the safe operation of portable electrical equipment and lighting with respect to:
(a) Safety of personnel (10)
(b) Areas made hazardous by the presence of flammable vapors (10)
Class 4 (4th Engineer)
SSEP
📅 Sep 2022
Reference Answer
### (a) Precautions for the Safety of Personnel
To ensure the safety of personnel using portable electrical equipment and lighting, a multi-layered approach encompassing equipment design, maintenance, and operational procedures is mandatory. The primary goal is to prevent electric shock, burns, and injuries from the equipment's mechanical action.
1. **Voltage Limitation & Supply Source:**
* **Supply Voltage:** As per regulations, the supply voltage for portable tools should ideally be limited. While the context states it should not exceed 240V, best practice and regulations for high-risk areas (e.g., damp or enclosed conductive spaces) mandate the use of Safety Extra Low Voltage (SELV), typically 24V AC, supplied via a safety isolating transformer.
To ensure the safety of personnel using portable electrical equipment and lighting, a multi-layered approach encompassing equipment design, maintenance, and operational procedures is mandatory. The primary goal is to prevent electric shock, burns, and injuries from the equipment's mechanical action.
1. **Voltage Limitation & Supply Source:**
* **Supply Voltage:** As per regulations, the supply voltage for portable tools should ideally be limited. While the context states it should not exceed 240V, best practice and regulations for high-risk areas (e.g., damp or enclosed conductive spaces) mandate the use of Safety Extra Low Voltage (SELV), typically 24V AC, supplied via a safety isolating transformer.
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