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IEEE 1584 ranges models
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Author:  7604 [ Sun Jul 13, 2014 8:57 pm ]
Post subject:  IEEE 1584 ranges models
Section 5.1 of IEEE 1584 defines the voltage range as below:

[*]Voltages in the range of 208 V–15 000 V, three-phase.

Does it means phase to phase voltage or phase to ground voltage? I understand that single phase arc quickly evolves into three-phase arc per IEEE model but does it true single phase to ground mean phase to ground voltage? If that is a case, then 25kV system with single phase to ground less than 15kV would be appropriated to apply IEEE 1585 instead of Arcpro which conflicts with OSHA software recommendation.
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Author:  wbd [ Mon Jul 14, 2014 4:27 am ]
Post subject:  Re: IEEE 1584 ranges models
That is the 3 phase voltage which is phase to phase to follow convention.

7604 wrote:
but does it true single phase to ground mean phase to ground voltage?


Not sure what you are asking here. Please clarify.

7604 wrote:
then 25kV system with single phase to ground less than 15kV would be appropriated to apply IEEE 1585 instead of Arcpro which conflicts with OSHA software recommendation.


This is a moot issue since it is answered above as it is 3 phase voltage and would fall into the More than 15 kV column in OSHA Appendix E Table 3.
Author:  7604 [ Mon Jul 14, 2014 6:03 pm ]
Post subject:  Re: IEEE 1584 ranges models
By definition, an electric arc is a visible plasma discharge between two electrodes that is caused by electrical current ionizing gasses in the air

wbd wrote:
That is the 3 phase voltage which is phase to phase to follow convention.


Varc < 15kV between two un-grounded conductors

wbd wrote:
This is a moot issue since it is answered above as it is 3 phase voltage and would fall into the More than 15 kV column in OSHA Appendix E Table 3.


25kV nominal voltage system with single phase to ground arcing ==> Varc < 15kV between un-grounded and grounded conductors

I understand the technical wording but my gut didn't feel the same.
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