Cooper Bussmann CT02MAN manual Egc

			Discontinuous Joints
			Require Bonding
											Bonding Jumper Not
											Required For Rigidly
For Qualifying Facilities											Bolted Joints
									Bond
EGCs in the Cables or
EGC Cables Are Not
Required If Rating Of The
Feeder Overcurrent Device											Conduit
Permits Using The Tray
	For the EGC										Three Phase
										Motor Installation
										Motor Control Center
					Bond
				EGC In
		Switchgear
					Cable
	Transformer					EGC
	(Solidly									Building Steel
	Grounded
	Secondary)
						Ground Bus
						Bonded To
							Enclosure		Lightning
									Protection
									Grounding
							System Ground

Correct Bonding Practices To Assure That The

Cable Tray System Is Properly Grounded

If an EGC cable is installed in or on a cable tray, it should be bonded to each or alternate cable tray sections via grounding clamps (this is not required by the NEC® but it is a desirable practice). In addition to providing an electrical connection between the cable tray sections and the EGC, the grounding clamp mechanically anchors the EGC to the cable tray so that under fault current conditions the magnetic forces do not throw the EGC out of the cable tray.

A bare copper equipment grounding conductor should not be placed in an aluminum cable tray due to the potential for electrolytic corrosion of the aluminum cable tray in a moist environment. For such installations, it is best to use an insulated conductor and to remove the insulation where bonding connections are made to the cable tray, raceways, equipment enclosures, etc. with tin or zinc plated connectors.

See Table 250.122 on page 51 for the minimum size EGC for grounding raceway and equipment.

Cable Tray Manual Cooper B-Line, Inc

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