New York State Master Electrician Practice Exam

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Open wiring on insulator is a wiring method using which of the following?

  1. Cables and conduits

  2. Flexible tubing and support cleats

  3. Metal raceways and junction boxes

  4. Insulated cable trays

The correct answer is: Flexible tubing and support cleats

Open wiring on insulator refers to a wiring method where conductors are supported by insulators, typically used in overhead electrical installations. In this method, the conductors are generally suspended in the air and secured using support cleats. This allows the wires to maintain a safe distance from surfaces that might cause shorts or ground faults, protecting the integrity of the electrical system while providing ventilation and minimizing risks associated with moisture accumulation. The use of flexible tubing is characteristic of this method as it aids in protecting the wires while allowing for some movement or adjustment during installation or maintenance. Support cleats assist in holding the wiring in place securely, making this method effective for open wiring applications. In contrast, other methods such as the use of cables and conduits, metal raceways and junction boxes, or insulated cable trays involve different wiring techniques and structures, focusing more on protection and enclosures rather than the open arrangement with insulators.

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