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Light Fixtures with Two Ballasts

Fluorescent tube light fixtures with two ballasts are typically wired in the same manner. Individual wires of one ballast connect to the one side of the fixture, individual wires from the other ballast connect to the other side of the fixture. The common wires of each ballast are connected to the other side of the fixture from each of the individual wires.

As seen below on ballast 1, individual wires are connected to the lampholders of lamp 2 on the left side, and the common wires on the right.

On ballast 2, common wires are connected to the lampholders of lamps 1 and 3 on the left side, and the individual wires on the right.

3 Lamp Series Two Ballasts Lampholder Wiring Diagram 1

3 Lamp Series Two Ballasts Lampholder Wiring Diagram 1

Using one 1 lamp and one 2 lamp series ballast

The 1 lamp ballast usually connects to the middle lamp, the 2 lamp ballast usually connects to the outer two lamps. If one of the outer lamps fail, the other outer lamp will not light up.


3 Lamp Series Two Ballasts Lampholder Wiring Diagram 2

3 Lamp Series Ballast Lampholder Wiring Diagram 2

Using two 2 lamp series ballasts

Series Ballast Lampholder Wiring 3 Lamps

3 Lamp Series-Parallel Ballast Lampholder Wiring Diagram

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3 Lamp Series-Parallel Ballast
3 Lamp Series Lampholder Wiring Diagram

3 Lamp Series Ballast Lampholder Wiring Diagram

Fluorescent Ballasts

Ballast Wiring

Parallel Ballast Wiring

Series Ballast Wiring 1 to 3 Lamps

Series Ballast Wiring 4 Lamps

Dimming Ballast Wiring

CFL Ballast Wiring

Fluorescent Lampholders

Fluorescent Lampholder Wiring

Parallel Ballast Lampholder Wiring

Series Ballast Lampholder Wiring 2 and 4 Lamps

Series Ballast Lampholder Wiring 3 Lamps

Swap Terminals on Non-Shunted Lampholders