Earthing and Bonding. All equipment shall be effectively bonded to ensure electrical continuity throughout the system. A separate earth continuity conductor shall be included with all wiring in conduits. No reliance shall be placed on metal to metal joints in conduits for earth continuity. The earth continuity conductors shall, as far as possible be in one (1) continuous length to the furthest part of the installation from the controlling switchboard, the earth conductor connecting all metal cases housing electrical equipment. The branches shall be connected to the main conductor by permanently soldered or mechanically clamped joints.
Earthing and Bonding. The main earthing terminal shall consist of a copper bar mounted horizontally along the length of the metering cubicle. Minimum c.s.a shall be 120sqmm. The earth bar shall be supported with appropriate brackets fixed to the wall. Ground earthing shall be by means of earth electrodes located in the meter rooms and connected by 25sqmm copper conductors and appropriate clamps to the main earth bar. Electrodes shall be made of solid copper, at least 2.4m long and with a minimum diameter of 16mm. The head of the electrode shall be housed in a precast or moulded inspection box with adequate cover installed flush at finished floor level. Earth electrodes shall be installed at a minimum distance of 2.4m from each other. The main earthing conductor between the main earth bar and the consumer’s switchgear shall have a c.s.a. of 10sqmm for single phase circuits and 16sqmm for three-phase circuits. Earthing conductors at the main earth bar shall be terminated using appropriate lugs and bolted to the earth bar.
Earthing and Bonding. F.3.4.6.1
