All CAST Lighting Fixtures: Lamps fail to light even though correct voltage is present.

Voltage is measured at the Spider Splice or Socket; when lamp load is applied, voltage drops.

Issue

Lamps on a single wire run fail to light even though lamps are good and correct voltage is measured at the Spider Splice or sockets (under no lamp load). When lamp load is applied, voltage drops and lamps fail to light.

Cause

A nick in the homerun wire or a poor connection at the transformer is putting all the current through a few strands of wire. With no lamp load, the voltage can be as expected at the fixture; when a lamp load is applied, the current exceeds the capacity of the strands, resistance increases and voltage drops low enough so lamps will not light.

Remedy

Check that suspect wires are making good connections to the terminal blocks and firmly tighten terminal block set screws. If lamps still do not light, inspect Spider Splice to ensure good connections there. Finally, visually inspect home run wire for damage. It may be necessary to replace homerun wire.

(Document No. : Created on: 08/10/08 Last modified on: 08/10/08)

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