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Example of connecting protective ground to chasis:
Requirement
Protective Earthing Connection
- Protective earthing terminals: The method use to clamp the conductor
should have preventive measure to prevent accidential loosening of the conductor.
- The resistance of the connection between the protective earthing terminal
or earthing contact and parts required to be earthed shall not exceed 0.1 Ohm. Compliance is check by passing through 12Vdc/ac, 25A current for
1 minutes, the voltage drop between the protective earthing terminal or earthing contact and the part to be earthed is measured and the
resistance is calculated from the current and this voltage drop.
- Protective earthing conductors are permitted to be bare or insulated. If
insulated, the insulation shall be green/yellow (conductor size should be 18AWG or better).
- Terminal: Pillar/stud type (with locking washer) must have 3 mm or
screw type 3.5mm. During tightened or loosen it will not work loose, internal wiring is not subject to stress.
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