ECS - Electrotechnical Certification Scheme Personal Protective Equipment (PPE) Questions and Answers — Questions and Answers
Question 1: An electrician is required to work on a low voltage distribution board where there is a significant risk of an arc flash. According to UK guidance, what is the most critical factor in selecting the appropriate arc flash protective clothing?
- The voltage of the system being worked on.
- The prospective short circuit current of the installation.
- The incident energy level (cal/cm²) calculated for that specific point. (Correct answer)
- The category rating (CAT) of the test equipment being used.
Correct answer: The incident energy level (cal/cm²) calculated for that specific point.
While system voltage and prospective short circuit current are factors in calculating it, the definitive value for selecting arc flash PPE is the calculated incident energy, measured in calories per square centimetre (cal/cm²). The PPE's Arc Thermal Performance Value (ATPV) must exceed the calculated incident energy level to provide adequate protection.
Question 2: Which British Standard specifically covers the requirements for electrically insulating helmets for use on low voltage installations?
- BS EN 397
- BS EN 166
- BS EN 60903
- BS EN 50365 (Correct answer)
Correct answer: BS EN 50365
BS EN 50365 is the specific European standard for electrically insulating helmets designed for working live or near live parts on low voltage installations (up to 1000V AC or 1500V DC). BS EN 397 covers general industrial safety helmets, BS EN 166 relates to eye protection, and BS EN 60903 is for insulating gloves.
Question 3: When using standard electrically insulating gloves conforming to BS EN 60903, what additional PPE is strongly recommended to be worn over them to protect against mechanical hazards like punctures or cuts?
- A second pair of insulating gloves.
- Cotton under-gloves.
- Leather protector over-gloves. (Correct answer)
- Arc flash rated gauntlets.
Correct answer: Leather protector over-gloves.
BS EN 60903 specifies that standard insulating gloves provide electrical protection but may be susceptible to mechanical damage. To protect their integrity, it is standard practice and highly recommended to wear suitable leather protector gloves over the insulating gloves.
Question 4: An electrician is carrying out a pre-use check on their Class 1 insulating gloves. According to best practice, what is the most effective method for identifying small punctures or air leaks?
- Stretching the glove and visually inspecting it against a light source.
- Performing an air inflation test by rolling the cuff to trap air. (Correct answer)
- Submerging the gloves in water and looking for bubbles.
- Checking the manufacturer's expiry date stamped on the cuff.
Correct answer: Performing an air inflation test by rolling the cuff to trap air.
The recommended pre-use check for insulating gloves involves trapping air inside by rolling the cuff tightly towards the fingers and then squeezing the glove to inflate it. This makes small holes or punctures, which would compromise safety, much easier to detect by listening for escaping air or feeling the pressure loss.
Question 5: Under the Personal Protective Equipment at Work Regulations 2022, what is the primary responsibility of an employer regarding PPE?
- To provide a list of approved suppliers from which employees must purchase their own PPE.
- To provide suitable PPE free of charge only to directly employed staff.
- To provide suitable PPE free of charge to all employees and 'limb (b) workers', and ensure it is properly maintained and its use is understood. (Correct answer)
- To subsidise the cost of PPE for all workers on site, including subcontractors.
Correct answer: To provide suitable PPE free of charge to all employees and 'limb (b) workers', and ensure it is properly maintained and its use is understood.
The Personal Protective Equipment at Work Regulations 2022 extended the employer's duty to provide suitable PPE free of charge beyond just employees to include 'limb (b) workers' (those with a more casual employment relationship). The duty includes assessing suitability, maintenance, and providing training on its correct use.
Question 6: Which of the following is NOT considered a primary function of standard safety footwear for an electrician working on a typical construction site?
- Protection against impact from falling objects via a toe cap.
- Providing the main source of electrical insulation when working live. (Correct answer)
- Resistance to penetration from sharp objects underfoot.
- Providing slip-resistant soles for various surfaces.
Correct answer: Providing the main source of electrical insulation when working live.
While some safety footwear has electrical insulating properties (EH rating), it should not be relied upon as the primary source of protection when working live. The primary protection comes from insulated tools, insulated gloves, and safe isolation procedures. The main functions of standard site safety boots are to protect against impact, puncture, and slipping.
ECS - Electrotechnical Certification Scheme Personal Protective Equipment (PPE) Questions and Answers
An electrician is required to work on a low voltage distribution board where there is a significant risk of an arc flash.
According to UK guidance, what is the most critical factor in selecting the appropriate arc flash protective clothing?