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111
Checking the bolted connections of the ceiling tube
1 Insulating rings
2 Washers
3 Spring lock washer
4 M12 nuts
•
Check all ceiling-tube bolts for presence of insulating rings (1), washers (2) and spring lock
washers (3).
•
Check for secure fit of all M12 locking nuts using a torque wrench set to 45 Nm.
•
Replace missing parts.
2. Checking potential equalization/protective conductor resistance
Tool required
Measuring instrument (e.g. Bender Unimet 800 ST)
•
The no-load voltage shall not exceed 24 V but must not lie below 4 V, either!
•
Be sure to use a suitable testing instrument for the measurement:
–
No-load voltage: max. 24 V
–
Test current: minimum 200 mA at 500
mΩ
•
If direct current is used as testing current, the measurement must be performed 2 times, using both
polarities.