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 Post subject: IEEE 1584 ranges modelsPosted: Sun Jul 13, 2014 8:57 pm

Joined: Thu Jun 05, 2014 5:52 pm
Posts: 19
Section 5.1 of IEEE 1584 defines the voltage range as below:

[*]Voltages in the range of 208 Vâ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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 Post subject: Re: IEEE 1584 ranges modelsPosted: Mon Jul 14, 2014 4:27 am
 Plasma Level

Joined: Wed May 07, 2008 5:00 pm
Posts: 711
Location: Rutland, VT
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.

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 Post subject: Re: IEEE 1584 ranges modelsPosted: Mon Jul 14, 2014 6:03 pm

Joined: Thu Jun 05, 2014 5:52 pm
Posts: 19
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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