CISPR TR 18-3:2017
[Current]
Radio interference characteristics of overhead power lines and high-voltage equipment - Part 3: Code of practice for minimizing the generation of radio noise
...ss than about 12 kV/cm...
...2 Preventive and remedial measures
When constructing high voltage equipment it is important
1) to ensure that all fixing bolts are securely tightened, and
2) to bond conducting elements, as far as is possible, either to earth or conductor potential...
...On distribution lines, bonding adjacent metal surfaces is important but bonding to earth or
conductor potential is not required for spark suppression...
