ETC CE Source Four Zoom Manuel D'installation page 17

Ground Test
The ground test indicates the safety of the earth ground connection to
the burner unit and reflector-housing parts. The connection could
become live if the insulation failed. It is not necessary to test continuity
to either the lens tube or the yoke, as these are separated by metallic
shields.
Follow the steps below to earth ground test a Source Four Zoom
luminaire.
1. Plug the luminaire into the PAT outlet and attach the test clip to the
PAT point on the luminaire.
2. Set the PAT device to test at 10 amperes and press the GO/TEST
button.
If your PAT device doesn't allow you to change the amperage, it can
still be used for the test. However, the earth tether, which connects
the burner assembly to the body of the unit, may get hot enough to
cause injury and could become permanently discoloured. This is
normal for test currents above approximately 20 amperes.
The PAT device should read less than 0.5 ohms. Most Source Four
Zooms give a reading of less than 0.1 ohms, if in good condition.
The Insulation test
The insulation proves that the internal insulation is in good condition.
You can use standard PAT devices to perform the insulation test.
Follow the steps below to test the luminaire's insulation.
1. Plug the luminaire into the PAT outlet and attach the test clip to the
PAT point on the luminaire.
2. Set the PAT device to test at 500 volts D.C., then press the G0/
TEST button.
A reading below 1M ohms indicates a possible or imminent failure.
Moisture buildup around the lamp holder or in the connector or foreign
matter accumulated around electrical connections can cause a low
reading.
Why a Source Four Zoom may give a fail reading
The majority of common appliances must fulfill an earth ground
resistance requirement of 0.1 ohms or less. Some simple, low-cost
PAT devices assume the 0.1 requirement and do not offer a method for
reading the actual resistance or for setting the fail level to 0.5 ohms, as
required for testing stage luminaires. These devices may provide a fail
reading for an acceptable unit if the resistance is slightly above 0.1
ohms. If in doubt, check with your PAT device supplier and verify that
the PAT device can correctly test a stage luminaire for the 0.5 ohm
condition.
CE Source Four Zoom • 15
English