bobby ocampo
Senior Member
What is the purpose of EQUIPMENT GROUNDING for UNGROUNDED SYSTEM AND HIGH IMPEDANCE GROUNDED SYSTEM?
The EGC provides an assured path to ground to permit proper operation of the ground detector for a single fault. And it provides the fault clearing path in case a second fault occurs in a different location before the first fault is corrected.What is the purpose of EQUIPMENT GROUNDING for UNGROUNDED SYSTEM AND HIGH IMPEDANCE GROUNDED SYSTEM?
The EGC provides an assured path to ground to permit proper operation of the ground detector for a single fault. And it provides the fault clearing path in case a second fault occurs in a different location before the first fault is corrected.
Other than providing for a ground path for the operation of a ground detector, what else does equipment grounding do for electrical safety of personnel on a single-line-to-ground fault?
Other than providing for a ground path for the operation of a ground detector, what else does equipment grounding do for electrical safety of personnel on a single-line-to-ground fault?
Arggg - I didn't answer your question. You lumped HRG and ungrounded together. My response discussed the differences - which isn't what you were asking.
So, trying again:
Gold pretty well nailed it. I don't have much to add.
However, a couple of questions to nail down exactly what you are asking:
When you say "equipment ground" are you only discussing the connection from the non-current carrying conductive sheet metal parts to earth?
Are you also including the "Equipment Bonding Conductor" that connects all the non-current carrying conductive sheet metal parts?
ice
Mainly. It also serves as a protection if the equipment becomes energized from another grounded source or from lightning induced currents.What is the purpose of equipment grounding and equipment bonding in UNGROUNDED AND HIGH RESISTANCE GROUNDED SYSTEM?
Is equipment grounding and bonding for the the detection and operation ONLY of ground detectors?
What is the purpose of equipment grounding and equipment bonding in UNGROUNDED AND HIGH RESISTANCE GROUNDED SYSTEM?
Is equipment grounding and bonding for the the detection and operation ONLY of ground detectors?
Mainly. It also serves as a protection if the equipment becomes energized from another grounded source or from lightning induced currents.
It also will discharge static electricity.
Serves a protection for what? Will a personnel be prevented from electrocution with the equipment grounding and bonding? Does the equipment grounding and bonding ONLY serves as a path for the operation of ground fault detection?
Q1: Other than that already mentioned, the purpose is the same as for grounded systems.
Q2: No
ice
HRG is considered grounded system based on IEEE 142. However unlike solidly grounded there is no immediate trip and low single line to ground fault compared with a solidly grounded system.
Just to refresh us what is the benefit of equipment grounding and bonding for SOLIDLY GROUNDED SYSTEM.
If you have something specific in mind, or a differing opinion:What might it/they be?
And what reasons would you have for thinking this?
Not really sure that there is any benefit of equipment grounding in an solidly grounded system but the equipment bonding provides a the fault clearing path and is required for safety....
Just to refresh us what is the benefit of equipment grounding and bonding for SOLIDLY GROUNDED SYSTEM.
What is the purpose of EQUIPMENT GROUNDING for UNGROUNDED SYSTEM AND HIGH IMPEDANCE GROUNDED SYSTEM?
What is the purpose of equipment grounding and equipment bonding in UNGROUNDED AND HIGH RESISTANCE GROUNDED SYSTEM?
Is equipment grounding and bonding for the the detection and operation ONLY of ground detectors?
Bonding all non current carrying components together puts them all at same potential whether they are grounded (earthed) or not at some other point in the system.
In any system grounded, ungrounded, high impedance grounded, it is nice to not have the frame of one piece of equipment at a different voltage then the frame of a nearby piece of equipment especially if you can touch both at the same time.
Nope, see below. A number of hazards are present without an EGC.
Remember this: all systems need an NEC (or similar standard, ie IEC, BS7671, ect) article 250 grounding and bonding system for a variety of reasons involved with human life safety and property protection. The ONLY difference between a solid ground and an ungrounded system is a bonding jumper from the transformer XO to the grounding system. An HRG is just a bonding jumper with an impedance. All else remains the same in terms of grounding and bonding.
The question is what will this bonding do for the safety of personnel if if this bonding will not operate the OCPD in an UNGROUNDED AND HRG SYSTEM on a single line to ground fault?
The question is what will this bonding do for the safety of personnel if if this bonding will not operate the OCPD in an UNGROUNDED AND HRG SYSTEM on a single line to ground fault?