† Install safety and reference grounding conductors.
† I&C cabinets must be provided with isolated bonding bars.
† A reference grounding grid should be supplied to telecommunication and control
rooms (when necessary).
† Adequate grounding bars should be provided for surge suppression devices
(SPDs).
† Care should be taken to monitor the effect of corrosion on metallic conductors
and enclosures.
In the case of I&C circuits, devices and cabinets, Figure 17.6 shows the lightning protection
scheme, including ELPSs (where necessary), the general grounding system
and the internal grounding system. The protective zones, radial bonding arrangement
and the shielding are as specified in IEC 62305-4 [18].