UL 773-2016 pdf download – Plug-In Locking Type Photocontrols for Use with Area Lighting.
3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 5 Glossary 5.1 ACCESSIBLE PART – A part so located that it can be contacted by a person, either directly or by means of a probe or tool. 5.2 CONTROL RECEPTACLE – An outlet device equipped electrically and mechanically to receive a control unit having a standard 3-blade plug configuration. 5.3 CONTROL UNIT – A plug-in, locking type, light-sensitive control device, with a standard 3-blade plug configuration, used with a mating control receptacle for the control of outdoor electric lighting fixtures for area lighting. 5.4 LIVE PARTS – Denotes metal or other conductive parts that have a potential difference with respect to ground or any other conductive part. 5.5 OPEN-CIRCUIT PLUG – A device similar in construction to a shorting plug, but intended to maintain a lighting fixture in the off mode of operation until removed. 5.6 SHORTING PLUG – A plug-in, locking type device, having the same standard 3-blade plug configuration as a control unit and which provides an electrical connection through the control receptacle of an outdoor electric lighting fixture, without performing a control function. A shorting plug is used as a substitute, where necessary, for a control unit and maintains a lighting fixture in the on mode of operation until removed.
7 Insulating Material 7.1 A base for mounting of uninsulated live parts shall be strong, not easily ignited, moisture-resistant and insulating. The base shall be so constructed that, considering the material used, it will withstand the most severe conditions likely to be encountered in service. 7.2 Insulating material, including barriers between parts of opposite polarity and material that may be subject to the influence of the arc formed by the opening of contacts, shall be acceptable for the particular application. 7.3 Vulcanized fiber may be used for insulating bushings, washers, separators, and barriers, but not as the sole support for uninsulated live parts. 8 Corrosion Protection 8.1 Iron and steel parts, except for thermal elements, magnet-pole faces, hardened and polished parts such as latching surfaces, and the like where such protection is impractical, shall be protected against corrosion by enameling, galvanizing, plating, or other equivalent means. 8.2 Phosphate treatment with an oil or wax coating is acceptable as corrosion protection for magnets and armatures; oil treatment is acceptable as corrosion protection for steel springs; and stainless steel is acceptable without additional protection, if properly polished or treated.