- Location
- Illinois
- Occupation
- retired electrician
Proposal:
(B) Phase Arrangement. The phase arrangement on 3-phase horizontal common power and vertical buses shall be so that when the leads of a phase rotation meter are connected A, B, C from front to back, top to bottom, or left to right, as viewed from the front of the industrial control panel that the phase rotation meter shall indicate a clockwise rotation. The B phase shall be that phase having the higher voltage to ground on 3-phase, 4-wire, delta-connected systems. Other busbar arrangements shall be permitted for additions to existing installations and shall be marked.
Substantiation: [FONT="]
As this section is currently written it has no meaning. It appears that the intent is to require a clockwise rotation. If this is not the intent, then the section does not accomplish anything as the terms A, B and C are only arbitrary terms and the section should be deleted from the code.[/FONT]
(B) Phase Arrangement. The phase arrangement on 3-phase horizontal common power and vertical buses shall be so that when the leads of a phase rotation meter are connected A, B, C from front to back, top to bottom, or left to right, as viewed from the front of the industrial control panel that the phase rotation meter shall indicate a clockwise rotation. The B phase shall be that phase having the higher voltage to ground on 3-phase, 4-wire, delta-connected systems. Other busbar arrangements shall be permitted for additions to existing installations and shall be marked.
Substantiation: [FONT="]
As this section is currently written it has no meaning. It appears that the intent is to require a clockwise rotation. If this is not the intent, then the section does not accomplish anything as the terms A, B and C are only arbitrary terms and the section should be deleted from the code.[/FONT]