| Date |
Text |
| 2016-05-12 16:07:49 | REVIEW 2014 5TH FBC ED. NEC 2011 |
| | MARIO VALDES |
| | ELECTRICAL PLAN EXAMINER |
| | 516-805-6713 |
| | [email protected] |
| | |
| | PROVISO: CLARIFY THIS ISSUE ON THE RISER AND PANEL |
| | SCHEDULE |
| | |
| | - NEC 110.15 HIGH-LEG MARKING. ON A 4-WIRE, |
| | DELTA-CONNECTED SYSTEM WHERE THE MIDPOINT OF ONE PHASE |
| | WINDING IS GROUNDED, ONLY THE CONDUCTOR OR BUSBAR |
| | HAVING THE HIGHER PHASE VOLTAGE TO GROUND SHALL BE |
| | DURABLY AND PERMANENTLY MARKED BY AN OUTER FINISH THAT |
| | IS ORANGE IN COLOR OR BY OTHER |
| | EDITION EFFECTIVE MEANS. SUCH IDENTIFICATION SHALL BE |
| | PLACED AT EACH POINT ON THE SYSTEM WHERE A CONNECTION |
| | IS MADE IF THE GROUNDED CONDUCTOR IS ALSO PRESENT. |
| | |
| | - NEC 408.3(E)(F) PHASE ARRANGEMENT. THE PHASE |
| | ARRANGEMENT ON 3-PHASE BUSES SHALL BE A, B, C FROM |
| | FRONT TO BACK, TOP TO BOTTOM, OR LEFT TO RIGHT, AS |
| | VIEWED FROM THE FRONT OF THE SWITCHBOARD OR PANELBOARD. |
| | 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. HIGH-LEG IDENTIFICATION. A SWITCHBOARD OR |
| | PANELBOARD CONTAINING A 4-WIRE, DELTA-CONNECTED SYSTEM |
| | WHERE THE MIDPOINT OF ONE PHASE WINDING IS GROUNDED |
| | SHALL BE LEGIBLY AND PERMANENTLY FIELD MARKED AS |
| | FOLLOWS: |
| | ?CAUTION _____ PHASE HAS _____ VOLTS TO GROUND? |
| | |
| | - RE-CONFIGURE RISER DIAGRAM AND PANEL SCHEDULE |
| | ACCORDINGLY TO IDENTIFY THIS HAZARD ! |
