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Wires connected to each side of a non-shunted lampholder can be swapped with the other side of the same lampholder.

In the first example below, notice the wires on the lower right lampholder pins.

In the second example below, the lower right lampholder terminals are swapped. Either wiring configuration will work.

Swap Terminals on Non-Shunted Tombstones

After Swapping Terminals

Swap Terminals on Non-Shunted Tombstone Diagrams

Fluorescent Ballasts

Ballast Wiring

Instant Start Wiring

Rapid Start Wiring 1 to 3 Lamps

Rapid Start Wiring 4 Lamps

Dimming Ballast Wiring

CFL Ballast Wiring

Emergency Ballasts

Tombstone Lampholders

Fluorescent Tombstone Wiring

Instant Start Tombstone Wiring

Rapid Start Tombstone Wiring 2 and 4 Lamps

Rapid Start Tombstone Wiring 3 Lamps

Swap Terminals on Non-Shunted Tombstones