2.6. Lamp holder / cap
Lamp holders and wiring for T5 lamps should be the 500V rated versions.
T5 VHO Extreme Temperature lamps have flattened pins for use in combination with Gx5 lamp holders. T5 lamps with round pins will not fit into the Gx5 lamp holders.The Gx5 lamp holders have a small plastic part on the top which prevents the insertion of lamps with round pins.
The following distances between lampholders in the luminaire must be used:
T5 VHO 95W Extreme Temperature (46 in)
Minimum distance | 45.24 in |
Maximum distance | 45.29 in |
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The Gx5 lamp holder can be mounted in the same way as G5 lamp holders. In case you are using automatic checking equipment of the wiring with automatic probes inserted in the top of the lamp holder, this operation is unfortunately no longer possible as the holes are used for the plastic insert of the Gx5 lamp holders.
The existing lamp holders for G5 capped lamps are suitable up to 250 volts, which means that the applied voltage must be lower than 250 volts towards the ground. As T5 lamps are especially designed for operation with the high frequency ballasts the voltage may exceed 250 volts under dimming conditions.
Several lamp holder manufacturers have G5 lamp holders in their range that are marked 500V, which means that voltages up to 500 volts towards the ground are allowed.
In general, all requirements relating to G5 type lamp holders will be summarized in IEC
OEM Design Guide Philips T5 VHO and HO Extreme Temperature Lamps and Ballasts 7