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| Subject - office work stations and free standing partitions | |
| ibew | new code art. 605.6& 605.7 has me con cerned what iam going to do with pwr coming from 2 different pnls . the high rise i work in has on every flr a 42 ckt A pnl with 1 ckt to furniture whip and a B pnl with 1 ckt to furniture whip both pnls are 3 phase 120 /208 some times other ckts with same neutral are used in private offices . sounds like this will be a real problem if a3 phase ckt brk is required per code . any good answers? |
| lctrc789 | Are you referring to the device with the same yoke (i.e.) a recpt. that has two different legs on it must be tied together.... I am not sure I follow the article, and I do not have 2005 code book in front of me OK guys what is up with this question... Is it stating that a 3 pole breaker must be tied together as a two pole breaker in a recpt. that has two different sources or what? |
| Ryan_J | I think you are pretty much screwed. The requirement isn't for a 3 pole breaker, just simaltaneous disconnect. That means you can use identified handle ties, which are probably preferred. Remember that a three pole breaker will open all three legs if one of the phases has a fault or overload, where only one would open with handle ties. Once again though, I see no way to satisfy this with two different panels. |
| Alfred | Ryan I would check with the furniture manufacturer to see if there are two circuits strips in the modules. If this the case a 3-phase circuit can be setup on one strip and another circuit on the other. I know this for previous installments. The model of furniture does make a difference. Many combinations are possible, check the specs for the job. Either the designer or engineer can give guidelines on installations. Thanks Alfred Johnson 
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| Alfred | Ryan I would check with the furniture manufacturer to see if there are two circuits strips in the modules. If this the case a 3-phase circuit can be setup on one strip and another circuit on the other. I know this for previous installments. The model of furniture does make a difference. Many combinations are possible, check the specs for the job. Either the designer or engineer can give guidelines on installations. Thanks Alfred Johnson
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| kbsparky | quote: A couple of electrically held, isolation relays placed in series with both circuits might do the trick. Each relay's coil would receive its power from one of the circuits, thus requiring both to be on before any power could proceed to the partitions in question. IF either circuit tripped out, the corresponding relay would drop out, disconnecting both circuits at the same time from the partitions. He would have to either mount the relays inside of the panelboards enclosures, OR mount a Hoffman type enclosure in the electrical room, and install the contactors there. Some sort of signage indicating which circuits are controlled from where would be appropriate. |
| Ryan_J | Sparky: Your'e right, I think that could work. |