What type of fire extinguisher is generally appropriate as a minimum for hot work involving metal/electrical sources, and why might a water extinguisher be unsuitable in some hot work settings?

A. Any extinguisher is equally suitable for any hot work location

B. Only foam extinguishers are ever appropriate for hot work

C. Fire extinguisher type is irrelevant as long as one is present

D. A dry powder or CO2 extinguisher is commonly specified, as water can be unsuitable near live electrical equipment or certain reactive materials, and the correct extinguisher type must be matched to the fire class present at that specific work site

A. Any task lasting longer than 30 minutes

B. Only welding using electric arc equipment

C. Any work involving an open flame, welding, burning, grinding, or any process that produces sufficient heat or sparks to act as a source of ignition for flammable materials, gases, or vapours

D. Only work carried out inside a cargo tank

A. A clear radius of at least 10 metres (or as defined by the risk assessment for the specific task and materials), with all combustibles removed or adequately shielded

B. No clearance is needed if a fire extinguisher is present

C. Clearance is only relevant for work carried out in an engine room

D. 1 metre is always sufficient regardless of the work type