A motor controller enclosure that is subject to occasional prolonged submersion shall be NEMA type ___.

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Study for the Independent Electrical Contractors (IEC) Year 4 Test. Use flashcards and multiple-choice questions, each with hints and explanations. Prepare effectively for your exam!

Multiple Choice

A motor controller enclosure that is subject to occasional prolonged submersion shall be NEMA type ___.

Explanation:
Protection against water ingress when an enclosure may be submerged for extended periods requires a submersible rating. NEMA 6P is the enclosure type designed for watertight performance even during prolonged immersion, making it suitable for a motor controller that could be occasionally submerged. Other ratings like 3S, 12, or 4X cover splash, rain, or corrosion-resistant protection but not prolonged submersion, so they would not meet the requirement. Therefore, for a motor controller enclosure that might experience occasional prolonged submersion, the correct type is NEMA 6P.

Protection against water ingress when an enclosure may be submerged for extended periods requires a submersible rating. NEMA 6P is the enclosure type designed for watertight performance even during prolonged immersion, making it suitable for a motor controller that could be occasionally submerged. Other ratings like 3S, 12, or 4X cover splash, rain, or corrosion-resistant protection but not prolonged submersion, so they would not meet the requirement. Therefore, for a motor controller enclosure that might experience occasional prolonged submersion, the correct type is NEMA 6P.

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