Insisting Bare Earth Conductor

In the U.S., to my knowledge, the National Electrical Code does not require a bare earthing conductor, but it is allowed. I assume you are wanting to know for India, I'm sorry I can't help for that area.

Edit: I was referring to the earthing conductor at the service entrance or separately derived system, not the equipment earthing conductor that will be routed with phase conductors for lighting, convenience receptacles, etc.

Youngin,

A small but important correction: The earthing (grounding) conductor is the one which goes to the grounding electrode or is for equipment grounding, and carries current only in a fault condition. BUT: The earthed (grounded) conductor is what we call the neutral which is a current-carrying conductor in the circuit(s).

Regarding the posted question: The only advantage I know of in using a bare grounding conductor is to reduce the cross-sectional area of conductors in a conduit.

To minimize inductive coupling and its associated risk of sparks or increased impedance in fault conditions, wherever a service grounding conductor is run through steel conduit for physical protection of the conductor, it must be bonded to both ends of the conduit.

Regards--JMM

Do You know why NEC suggest insulated earth conductor?

I ask, which will be better in safety aspects? Bare conductor or Insulated? I understand, most of the standards don't insist for any one. Both can be used. But, which will be better? I suggest, the bare one is better. What u say?

In case you use sensitive earth fault relay bare is no problem. But, insulated conductor will protect earth conductor from corrossion due to galvanic cell when it comes in contact to a dissimilar material.

In most countries bare earths have not been allowed for many years. Because they are dangerous as well as the corrosion problem. if you cant work out the common sense behind this regulation then maybe you should go back to school

Certainly using bare conductor when your earth conductor for lightning protection is used underground.

And in light wiring, the earth wire have to be coloured according to Indian Standards.

Hey, Basre conductor is normally used in Earth Grid. And while sizing a corrossion allowance is considered. But the Galvanic corrossion is mostly ignored.

S Sir u r right, Bare conductor is normally used in Earth Grid and for lightning protection only. Other cases everything with insulated conductor only, the colour is either Green or Yellow-Green.