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    A sheave used to equalize tension in opposite parts of a rope. Because of its slight movement, it is not termed a running sheave.

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    Service classification covered by CMAA Specification No.70, “Specifications for Electric Overhead Traveling Cranes."

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    Used for lifting and/or moving loads intermittently over variable paths.

    Four main categories:

    • Hand trucks
    • “Walkies”
    • Riding trucks
    • Automatic guided vehicles or AGVs (computer-guided and controlled riding trucks)

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    Motor winding insulation rating which indicates its ability to withstand heat and moisture.

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    A method of control by which the fixed line voltage and frequency is changed to a three-phase system with infinitely variable voltage and frequency.