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"404.5 Time Switches, Flashers, and Similar Devices.

Time switches, flashers, and similar devices shall be of the

enclosed type or shall be mounted in cabinets or boxes or

equipment enclosures. Energized parts shall be barriered to

prevent operator exposure when making manual adjustments

or switching.

Exception: Devices mounted so they are accessible only to

qualified persons shall be permitted without barriers, provided

they are located within an enclosure such that any

energized parts within 152 mm (6.0 in.) of the manual adjustment

or switch are covered by suitable barriers."

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