EQUIPMENT GROUNDING CONDUCTOR FOR UNGROUNDED SYSTEM

[electrofelon]

In an ungrounded system without a grounding conductor connected to the grounding electrode and connected to a metal enclosure of the service conductors you don't have a low impedance path to trip the breaker. In case of a phase to ground fault.

Huh?

 

[mtnelect]

Huh?

Sorry ... I meant the enclosure being energized by a fault.

 

[electrofelon]

Sorry ... I meant the enclosure being energized by a fault.

We are talking about an ungrounded system. First fault just makes it a grounded system.

 

[mtnelect]

We are talking about an ungrounded system. First fault just makes it a grounded system.

So why have Section 250.24 (E) in the first place. Seems to me on the first fault if someone touches the enclosure without having an equipment ground it can be dangerous.

 

[bobby ocampo]

You can think thru the first question yourself.

You did not answer my question. I assume that you don't know the answer?

HRG is not an ungrounded system. Do you understand how an HRG works?

Yes I know how HRG and Low Resistance grounding works in accordance with IEEE 142 Chapter 1

 

[bobby ocampo]

We are talking about an ungrounded system. First fault just makes it a grounded system.

What then is the purpose of the EGC on safety if there is a single line to ground fault in an ungrounded system?

 

[bobby ocampo]

To the original poster, you would benefit from getting a copy of Mike Holts bonding vs grounding DVD and watching it

We need to chalenge the teaching for the benefit of safety.

 

[bobby ocampo]

So why have Section 250.24 (E) in the first place. Seems to me on the first fault if someone touches the enclosure without having an equipment ground it can be dangerous.

The equipment grounding conductor will not trip the OCPD on a single line to ground fault for an UNGROUNDED SYSTEM. The question now is what is the purpose of the EGC if it will not trip the breaker based on the video of Mr. Mike Holt? Does connecting to earth have another use to protect people against electrocution and shock other than a return path to operate the OCPD?

 

[bobby ocampo]

We are talking about an ungrounded system. First fault just makes it a grounded system.

What is the purpose of connecting to earth if EGC wil not trip the OCPD? What happens if you have a ground rod in the equipment where the single line to ground fault occurs? Will you experience electric shock or be electrocuted?

 

[bobby ocampo]

What hazard is created by a single line to ground fault on an ungrounded system?

If there is no EGC you will be electrocuted? The question is the mechanism of action on how EGC works. Imagine one line touching an equipment and a person touch the equipment. Will the person be electrocuted?

 

[bobby ocampo]

1. To allow fault detectors to work
2. To allow 2nd faults to clear.
3. To bond all non-current caring metal parts together to reduce touch potential from things like capacitive effects.
4. To connect all non-current caring metal parts to Earth to provide equi-potential during normal operation.

Will EGC protect a person from experiencing an electrical shock or EGC protect a person from electrocution even if the breaker will not trip on a single line to ground fault?

What if there is no EGC?

 

[bobby ocampo]

What hazard is created by a single line to ground fault on an ungrounded system?

Will you be electrocuted by touching the ungrounded conductor in an UNGROUNDED SYSTEM?

If one of the conductor, for whatever reason touched the equipment and a person touch the metal part of the equipment without EGC or connection to earth, will the person be electrocuted?

 

[bobby ocampo]

The ungrounded system does not have bonding jumper, other than that is the same as a grounded system

Do you mean that EGC is still required in UNGROUNDED SYSTEM, even if it will NOT OPERATE THE OCPD?
QUESTION now is how can EGC protect against electrocution and electric shock if the only purpose of EGC is to operate the OCPD?