NEBOSH Work Equipment Safety 4 — Questions and Answers
Question 1: What does PUWER 1998 Regulation 11 require regarding dangerous parts of machinery?
- Dangerous parts must be painted red
- Effective measures must be taken to prevent contact with dangerous parts, following a hierarchy of guarding measures (Correct answer)
- Dangerous machinery must be used only by managers
- All dangerous machinery must be imported from EU-approved countries
Correct answer: Effective measures must be taken to prevent contact with dangerous parts, following a hierarchy of guarding measures
Regulation 11 requires employers to take effective measures to prevent access to dangerous parts of machinery. The hierarchy is: (1) fixed enclosing guards, (2) other guards or protection devices, (3) jigs/holders/push-sticks, (4) information/instruction/training/supervision. Higher-level measures must be used where practicable.
Question 2: Under LOLER 1998, what is meant by 'lifting operations' that the regulations apply to?
- Only operations using overhead cranes in factories
- Any operation involving the lifting or lowering of a load, including suspending a load using work equipment (Correct answer)
- Only manual handling activities
- Only construction site crane lifts
Correct answer: Any operation involving the lifting or lowering of a load, including suspending a load using work equipment
LOLER 1998 defines a lifting operation broadly as any operation concerned with the lifting or lowering of a load. This includes operations using cranes, hoists, forklift trucks, vehicle tail lifts, patient hoists in healthcare, and any other work equipment used to lift or lower loads.
Question 3: What colour coding is used on an emergency stop control on machinery under PUWER 1998?
- Green button on white background
- Blue button on grey background
- Red button/actuator on yellow background (Correct answer)
- Orange button on black background
Correct answer: Red button/actuator on yellow background
PUWER Regulation 16 and BS EN ISO 13850 specify that emergency stop controls must use a red actuator (button, mushroom head, or pull-cord) on a yellow background. This internationally recognised colour combination ensures rapid identification in an emergency situation.
Question 4: A chain sling shows signs of wear with links stretched by more than 5% of their original length. What action should be taken?
- Continue using it but reduce the SWL by 10%
- Apply lubricant and continue using it
- Immediately withdraw it from service and quarantine it for disposal or repair (Correct answer)
- Use it only for lighter loads
Correct answer: Immediately withdraw it from service and quarantine it for disposal or repair
A chain sling with links stretched by more than 5% has exceeded its rejection criteria under BS 7121 and manufacturer guidance. It must be immediately taken out of service, clearly tagged as defective, and quarantined to prevent inadvertent use. Continued use risks catastrophic failure under load.
Question 5: What type of interlocking device ensures the guard cannot be opened until a dangerous machine part has completely stopped?
- A proximity sensor
- A guard locking device (interlocking with guard locking) (Correct answer)
- A light curtain
- A pressure-sensitive mat
Correct answer: A guard locking device (interlocking with guard locking)
A guard locking device (also called interlocking with guard locking) keeps the guard physically locked closed until the dangerous condition (such as a rotating spindle) has ceased. This is essential on machines where dangerous parts take time to run down after power is removed, preventing premature guard opening.
Question 6: PUWER 1998 applies to which of the following?
- Only new equipment purchased after 1998
- All work equipment provided for use or used at work, including second-hand and existing equipment (Correct answer)
- Only electrical equipment
- Only equipment used in construction
Correct answer: All work equipment provided for use or used at work, including second-hand and existing equipment
PUWER 1998 applies to all work equipment provided for use or used by employees at work. This includes new, second-hand, hired, leased, and existing equipment. The term 'work equipment' covers any machinery, appliance, apparatus, tool, or installation used at work.
NEBOSH Work Equipment Safety 4
What does PUWER 1998 Regulation 11 require regarding dangerous parts of machinery?