What are the recommendations for Grounding System?

Grounding System

Ground rods 2.4 meter minimum length.

Cathode protection material is used galvanized steel.

Individual Ground rod maximum resistance should be 2.5 Ohm .

For copper or copper jacketed steel rods is a minimum of 16 mm 2 in diameter or 19 mm 2 in diameters.

Earth Tester is used for measuring of earthling system.

Underground wire for grounding to wire connections shall be cadweld or thermoweld . Compression connector shall not be used.

Shields wires shall be grounded only at the one point for the signal cables.

Shields and armor of power cables shall be grounded at both ends.

If used for connections of equipment to ground rods or ground grid be minimum 25 mm 2 (# 4 AWG).

Metallic cable trays shall be bonded at both end points and a minimum of every 25 Meter to the local ground grid.

If buried / used for grids or interconnections of ground rods to be minimum 70 mm 2 (2/0AWG).

Be copper or copper jacketed steel or galvanized steel or copper jacketed steel shall meet the requirements of UL 476 (Underwriters Laboratories).

Power Applications: Metal cable trays must be grounded and eclectically continuous systems as per NEC article 318.

Non-Power Applications:

Cable tray systems containing conductors outside the scope of NEC Article 250 (such as communications, data, signal cables, etc.

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