GROUNDING SYSTEM

Grounding System

Ø  Ground rods 2.4 meter minimum length.

Ø  Cathode protection material is used galvanized steel.

Ø  Individual Ground rod maximum resistance should be 2.5 Ohm.

Ø  For copper or copper jacketed steel rods is a minimum of 16 mm2 in diameter or 19 mm2 in diameters.

Ø  Earth Tester is used for measuring of earthling system.

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

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

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

Ø  If used for connections of equipment to ground rods or ground grid be minimum 25 mm2 (# 4 AWG).

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

Ø  If buried / used for grids or interconnections of ground rods to be minimum 70 mm2 (2/0AWG).

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

Ø  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.