Ungrounded Delta Votage to ground

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zbang said:
I've been staying out of this and perhaps I'm missing something, but what is the purpose of this discussion? It's not clear whether the OP is trying to answer a test question, is trying to teach something to those who already know the subject, advocating a particular grounding method, or what.
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To understand please answer the question
What is the voltage to ground for a delta connected one leg with center tap if the line to line voltage is 240 volts?
a. Voltage of line 1 to ground?
b. Voltage of line 2 to ground?
c. Voltage of line 3 to ground
d. Voltage of center tap in one leg to ground?

What will be the voltage to ground if the delta is corner grounded?
What is the voltage to ground if the delta is center tap in one leg grounded?
 
__dan said:
Distributing three phase three wire without an equipment grounding conductor using only local Earth grounds, "peg grounds" in this report, is a known cause of fatalities.
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No one is saying that only the connection to earth is sufficient for solidly grounded. However, connection to earth with bonding will help IEEE 142 Chapter 2
__dan said:
Lack of the equipment ground does not trip the upstream device and the exposed remote metal floats at the line Voltage, including the earthing system. The worker completes the circuit from the floating exposed metal, to the Earth.
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What do you think is the purpose of equipment grounding in ungrounded system and HRG?
__dan said:

MSHA - Technical Reports - MSHA METAL/NONMETAL ELECTRICAL GROUNDING REQUIREMENTS

Federal enforcement agency responsible for the health and safety of the nation's miners.
arlweb.msha.gov
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LarryFine said:
Just as we size line conductors to minimize voltage drop, in order to attempt to force all of the voltage to be dropped across the intended load, we likewise size grounded conductors for the same reason. We want the voltage at the load to remain as close as we can to what it is at the source.

That means that we want the voltage at the load end of the intentionally-grounded conductor to be as close as it can be to zero volts to earth as possible, even under load. However, we're realistic enough to realize that it will rise at times, which is why, except for OCP, we treat it like a line conductor.

See: https://forums.mikeholt.com/threads/understanding-the-neutral-conductor.140537/
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Does equipment grounding conductor have the same purpose for ungrounded and HRG?
 
zbang said:
It would be more productive to answer your own questions and let us discuss that instead of asking others to do the work and provide the answers.
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It will not be productive if you will not answer the questions to clear up some misconceptions about the purpose of connecting to earth. Is it safe to assume that you don't know the answer to the questions?
 
There are a number of Internet Articles available such as this one which will give far better insight on grounding than we can here.
www.allumiax.com

All About Electrical Grounding Systems

Learn how electrical grounding has become an essential part of everyday electricity after the advancement in technology.
www.allumiax.com www.allumiax.com
 
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