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Parallel ballasts use a single wire for connections to each end of a fluorescent tube. A shunted lampholder connects the lamp pins together. Generally instant start ballasts are wired in parallel.
2 and 3 Lamp Parallel Ballast Wiring
2 and 3 lamp parallel ballasts use blue wires for individual connections, and red wires for common connections. Black wire is for line voltage and white wire for neutral. A parallel ballast uses a single wire which connects from the ballast to each of the lamp terminals.
Parallel Ballast Wiring Diagrams
Parallel Ballast Wiring
2 Lamp Parallel Ballast Wiring Diagram
2 Individual wires, 1 common wire
3 Lamp Parallel Ballast Wiring Diagram (2 Ballasts)
One 2 lamp and one 1 lamp ballast
4 Lamp Parallel Ballast Wiring Diagram
4 Individual wires, 2 common wires
4 lamp parallel ballasts and 2 lamp series ballasts use blue and red wires for individual connections, and yellow wires for common connections.
- A parallel ballast uses a single wire connecting the ballast to each of the lamp terminals.
- A series ballast uses two wires connecting the ballast to each of the lamp terminals.
3 Lamp Parallel Ballast Wiring Diagram
3 Individual wires, 1 common wire
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Parallel Ballast Wiring
Series Ballast Wiring 1 to 3 Lamps
Parallel Ballast Lampholder Wiring
Series Ballast Lampholder Wiring 2 and 4 Lamps