What safety distance (air clearance) must be maintained from exposed un-insulated 6.6 kV conductors?
Direct Answer
Option B: Minimum safe clearance distance (~150 mm to 250 mm depending on standard, plus safety margin)
Maintaining safe air clearance is fundamental to preventing flashovers. For 6.6 kV systems, specific distances—typically 150 mm to 250 mm—must be maintained between live conductors and earthed structures. These clearances are defined by international standards to account for atmospheric conditions and prevent accidental arcing during maintenance or inspection.
All Options
Detailed Explanation & Context
Maintaining safe air clearance is fundamental to preventing flashovers. For 6.6 kV systems, specific distances—typically 150 mm to 250 mm—must be maintained between live conductors and earthed structures. These clearances are defined by international standards to account for atmospheric conditions and prevent accidental arcing during maintenance or inspection.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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