Sri Lanka NVQ Level 3 Welder Written Examination Practice Questions - Sri Lanka NVQ Level 3 Welder Written Examination (TVEC DTET) Exam

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Under TVEC guidelines, what is the maximum open-circuit voltage (OCV) range typically permitted on standard Manual Metal Arc Welding (MMAW) power sources, and why does this present a shock hazard?

12 to 24 Volts DC, which is sufficient to penetrate dry human skin. 50 to 80 Volts AC or DC, which can overcome human body resistance, especially in wet or humid conditions. 220 to 400 Volts AC, which is the input voltage of the primary transformer coils. 1000 to 2000 Volts AC, which is required to ionize the air to strike the arc.

Correct Answer:

50 to 80 Volts AC or DC, which can overcome human body resistance, especially in wet or humid conditions.

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