1 : Surface area is a country's total area, including areas under inland bodies of water and some coastal waterways. 2  Irrigated land: The number of square kilometers of land area that is artificially supplied with water. 3  Population density: People per square kilometre, in 1999. 4  At this time the world average was 14.42.
A ground fault is an inadvertent contact between an energized conductor and ground or equipment frame. The return path of the fault current is through the grounding system and any personnel or equipment that becomes part of that system.
If ground-fault protection is installed, size the EGC based on the ampere rating of the ground-fault protection per Table 250.122 where ground-fault protection of equipment is installed. 1  The installation must meet the three following conditions, or you must size the EGC per the first method: 1  Maintenance and supervision ensure only qualified persons will service the installation. 2  Ground-fault protection is set to trip at not more than the ampacity of a single ungrounded conductor.