USCG Exam PracticeElectrical safety and general safety
In an engine room with a damp, grounded environment, a technician with wet hands contacts an energized conductor. Which physiological factor most significantly increases the shock hazard compared to the same contact in a dry environment?
- A. Increased voltage of the source circuit
- ✓ Reduced body resistance due to wet skin, allowing greater current flowCorrect
- C. Increased capacitance of the body in a humid atmosphere
- D. Reduced inductance in the circuit caused by the presence of seawater
Why B is correct
Per NEETS Mod. 1 §1-4, body resistance is the limiting factor in electrical shock hazard. Dry, intact skin may present 100,000 ohms or more, but wet skin can drop resistance to a few hundred ohms, dramatically increasing current flow through the body even at low voltages. It is current through the body, not voltage alone, that determines the severity of injury.
Cited:NEETS Mod. 1 §1-4