What type of cable are you using to extend the wiring, you have to be careful because standard nmd90 (loomex) is only rated for 300 volts and with hid lighting te strike voltage can run upwards of 400 Volts. The cable you use has the be 600volt rated sow cable (aka cabtire) would be a appropriate choice also the connectors that you use need the same voltage rating, note this is only for the secondary side of the transformer. The primary side would be ok
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