11. TESTING!!!

Yes you're playing with 220VAC. So before we go any further, we must test to make sure this fitting is safe to use.

1. Remove lamps
2. Use an ohmmeter to measure the resistance from the earth pin on the plug to each of the metal parts. This must be less than 1 ohm.
3. Use an insulation resistance tester (Megger) to measure between phase&neutral to earth at 500VDC. This must be over 1Mohm to be considered safe.
4. Now test between phase and neutral @ 500VDC and the result must also be over 1Mohm.
5. Test between phase pin and the centre of the lamp holder using an ohmmeter - this is testing the polarity is correct.
6. Replace lamps.

These tests are taken from AS/NZS 3760 which are the portable appliance testing standards in my home country. Your country may have different requirements.

If all of these are OK plug her in and flip the switch!