Discussion thread regarding Schematics for the Constant Wattage Autotransformer [CWA] type Ballasts, for use with Mercury Vapor [MV], Metal Halide [MH], or High Pressure Sodium [HPS] lamps.

These Schematics are found in the Technical Reference area, under the topic heading:

HID Ballast Schematics: CWA

Fig. 3.1. = Constant Wattage Autotransformer Ballast with "Quadri-Volt" input - for driving one Mercury Vapor, or Metal Halide lamp.

Fig. 3.2. = CWA Ballast with "Quadri-Volt" input - for driving one High Pressure Sodium, or "Pulse Start" Metal Halide lamp.

Fig. 3.3. = CWA Ballast with "Quadri-Volt" input - for Independent [parallel] operation of two H33 or M59 lamps.

These Ballasts have a common conductor which is common to both the input and the lamp screwshell. This common conductor should be connected to the system's grounded conductor, so the hazard of a live screwshell is minimized. That helps to reduce the "Shocking Experience" found when the screwshell of a lamp has L-G [Line to Ground] potential.
That Scenario is often followed by the tossing of said lamp, loud and extreme obscene word strings/phrases, and an almost certain crash course in Newtons laws of motion and 1st hand experience of the transfer of potential energy to kinetic energy - when contact is made to the ground below [AKA potential energy = Sparky's mass- in Kgs, by the length of fall (ladder height = min. 8 Meters) = kinetic energy at concrete slab]. This formula does not take in to consideration the kinetic energy released in swear words or blood loss, after impact.

Any Comments??? [there's gotta be some [Linked Image]]

Scott SET

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!