ANSI NEMA C78.41 pdf free download

ANSI NEMA C78.41 pdf free download.American National Standard for Electric Lamps—Guidelines for Low-Pressure Sodium Lamps.
3 Lamp Designations Designations for low-pressure sodium lamps are assigned in accordance with ANSI C78.380. For reference, the older designations are shown in parentheses in the lamp data sheets. Note that the number (two or three digits) following the first letter in the designation (L for low pressure sodium), indicates a unique set of electrical characteristics. Following the number is a slash followed by a luminaire characteristic letter. Low-pressure sodium lamps are typically used in enclosed luminaires and have a luminaire characteristic code of“E.” Marking low-pressure sodium lamps with the ANSI designation is not required. 4 Bulb Designations Bulb designations are defined in ANSI C79.1. Due to long-term use of the conventional method of bulb designations, that use will continue herein with the equivalent metric bulb designations shown in parentheses (i.e., BT28 [BT90]) in contrast with the use of metric primary dimensions elsewhere in this standard. Base Specifications The BY22d base is described in ANSI C81.61.6 Maximum Outline Drawings The maximum outline drawings in Part II of this standard show the maximum limits of the space that may be occupied by any part of the bulb for each lamp type. These limits are in accordance with IEC 60192. Most luminaires for low-pressure sodium lamps constrain the dome end of the lamp and take up any eccentricity of the lamp by means of a moveable base holder. Accordingly, the maximum outline drawings allow for the maximum bulb diameter at the dome end and for eccentricity at the base end. 7 Other Safety Requirements and Information Lamps shall comply with the requirements of ANSI/IEC C78.62035. Low-pressure Sodium lamps contain a quantity of sodium that may heat from a reaction with moisture in the air or on the skin if the lamp is broken. Sodium may burn spontaneously when exposed to air. Consult the lamp manufacturer’s literature for information on the proper use, care, and disposal of these lamps.8 Methods of Measurement An American National Standard for methods of measuring the electrical characteristics and the bulb and base temperatures of low-pressure sodium lamps has not been written. General guidelines for these measurements may be found in ANSI C78.389 and IEC 60192. 9 Electrical Characteristics 9.1 Lamp Operating Characteristics The values of lamp volts, amperes, and watts shown on the individual lamp data sheets in Part II of this standard apply for lamps that have aged 100 hours. Lamp rms voltage may increase with operating hours. Contact the lamp manufacturer for details. 9.2 Warm-up Time Bare lamps operating in still air shall reach a stabilized voltage within the time limit and at the ambient temperature specified on the applicable lamp data sheet in Part II of this standard. For purposes of this test, low-pressure sodium lamps have reached a stabilized voltage when their voltage does not vary more than 2% in any one-minute period. Lamps shall meet this requirement when operated on the appropriate reference ballast specified in Part II, section 4, and in the allowed operating position most adverse to warm-up. 10 Reference Ballasts Reference ballasts shall meet the general requirements described in ANSI C82.5.ANSI NEMA C78.41  pdf download.