ANSI C78.40 pdf free download

ANSI C78.40 pdf free download.American National Standard for Electric Lamps- Specifications for Mercury Lamps.
3 Definitions
Mercury lamp terms used in this standard can be found in ANSI C82.9.
4 Methods of Measurement
Measurement of the electrical characteristics and the bulb and base temperatures of mercury lamps shall be made in accordance with ANSI C78.389.
5 Lamp Specifications
Lamps must meet the requirements contained within ANSI C78.62035 as well as the specifications contained in this standard.
6 Lamp Designations
Mercury-lamp designations are assigned in accordance with ANSI C78.380. Note that the number (two or three digits) following the first upper case letter in the designation indicates a unique set of electrical characteristics. Following the lamp number may be a slash followed by a luminaire characteristic letter. Operating position limitations are as indicated on the lamp marking.
7 Bulb Designations
Bulb designations are defined in ANSI C79.1. Due to the long term use of customary designations, they will continue to be used herein. Metric designations for bulbs are not given in this standard.
8 Base Specifications
Screw-shell-type bases are specified in ANSI C81 .61.
9 Maximum Outline Drawings
The maximum outline drawings in Part Ill of this standard show for each bulb-base-MOL category the maximum limits of the space that may be occupied by any part of the bulb, assuming a fixed base position. They do not define the actual bulb shape. The limits shown take into account the maximum bulb dimensions and the possible eccentricity of the bulb with respect to the base. The dashed lines indicate typical bulb shapes. A lamp with its base in a fixed position shall remain within the limits of the outline in the relevant maximum outline drawing. Maximum outline drawings are produced in accordance with ANSI
C78.30.
10 Electrical Characteristics
10.1 Lamp operating characteristics
The lamp operating characteristics in part II of this standard apply to bare lamps operating on a reference ballast at an ambient temperature of 25°C ±5°C (77°F ±9°F). The values of lamp voltage, current, and wattage shown on the individual lamp data sheets in Part II are those that apply after the lamps have been aged for 100 hours.
The operating voltage of lamps tends to follow a normal distribution pattern. For all lamp types except the 700 W H35 and 1,000 W H36 types, at least 95% of all lamps produced can be expected to have an operating voltage within ±10 V of nominal. For the 700 W H35 and 1,000 W H36 types, the operating voltage range for 95% of the lamps is ±16 V from nominal.
The voltage rise to end-of-life may approximate 1 % for each 5,000 hours of operation.
10.2 Warm-up time
Bare lamps operating in still air shall reach 95% of the minimum lamp operating voltage within the time limit and at the ambient temperature and current specified on the applicable lamp data sheet. Lamps shall meet this requirement in the burning position most adverse to warm-up.
11 Reference Ballasts
The reference ballast provides a standard means of comparison and is used to ensure reproducible results when measuring lamp characteristics. Reference ballasts for mercury lamps are series reactor types, and do not include any step-up transformation. Only reference ballasts for 60 Hz operation, with a power factor of 0.075 ±0.005, shall be used. The general requirements for reference ballasts are outlined in ANSI C82.5.
The specific values for each reference ballast type are given on the relevant lamp data sheet.
12 Ballast Design
For additional ballast requirements see ANSI C82.4, for methods of measurement see C82.6, and for definitions see C82.9.
12.1 Open-circuit voltage
The minimum ballast open-circuit voltages shown on the individual lamp data sheets assure starting and operating reliability as follows: at 10°C (50°F), 98% probability of starting 0-hour lamps; at —15°C (+5°F) and —30°C (—22°F), 90% probability of starting 100-hour lamps.
The voltage values shown on the lamp data sheets apply to sine-wave open-circuit voltages (peak to rms ratio of 1.414). If a higher ratio of peak to rms is provided, up to a value of 1.8, the rms voltage may be decreased below that specified in the data sheets, provided that the peak voltage is increased 1% for each 2% decrease in the rms voltage and that the rms voltage is not reduced below the voltage necessary for stable lamp operation.
12.2 Starting current
Starting current shall be measured 5 to 15 seconds after the lamp circuit has been energized and shall be within the limits shown on the applicable lamp data sheet.ANSI C78.40 pdf download.