If you are searching to purchase earthing systems, it is very important to review following five tips:
1-SIZE OF CONDUCTORS:
Failure to use right fault time in layout calculations creates a high danger of melted conductors. As an instance, a 4/zero AWG conductor can withstand 40 two, 700A for 0.5 sec before fusing. But, this equal conductor can resist simplest 13,500A for five sec. IEEE eighty suggests using three. Zero sec for small substations. This time is same to the short-time score of most switchgear.
2-SELECT RIGHT CONNECTORS:
E connections among conductors and the primary grid, and among the grid and floor rods, are as critical because the conductors themselves in retaining an eternal low-resistance course to the ground. You need to don't forget the kind of bond the connection creates with the conductor or floor rod and temperature limits.
3-GROUND ALL SWITCHES:
To protect the switch operator in case of a fault, place a safety mat on or beneath the earth's ground in any respect transfer handles. In all, however, the first association, every the switch working cope with and the personnel protection grate (or mat) have to be exothermically welded to structural metallic, therefore making sure nearly zero voltage drop.
4-GROUNDING THE FENCE:
Utilities range of their fence-grounding specifications, with maximum specifying that every gate publish and nook positioned up, plus each 2nd or 0.33 line publish, be grounded. All gates ought to be bonded to the gate posts the use of flexible jumpers. All gate posts ought to be interconnected.
Soil conductivity is a crucial attention in substation design. The lower the resistivity, the simpler it's far to get a great ground