﻿ How to Replace 4 Lamp Two Series Ballasts with Parallell - Electrical 101

# How to Replace 4 Lamp Two Series Ballasts with Parallel

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Factory wiring

## Light Fixtures with Two Ballasts

A 4 lamp fixture with two series ballasts can be replaced with a 4 lamp parallel ballast. As seen below, connecting the 4 lamp parallel ballast to the four lamps can be a bit confusing. This is because the wire colors on the ballast and the lampholders do not match up on two of the connections.

1. On the 4 lamp parallel ballast diagram below, each individual wire is connected to a pair of individual wires on the lampholders. Two individual wires of the same color (blue or red) connect to each of the individual pairs on lamps 1 and 4. The other two individual wires of the same color (blue or red) connect to each of the individual pairs on lamps 2 and 3.
2. One of the yellow common wires connect to the common wires of lamps 1 and 4. The other yellow common wire connects to the common wires of lamps 2 and 3.