Is it required to provided dedicated transfer switches between the different emergency systems branches 700 vs 701 vs 702? I understand where it discusses the wiring and seperation reqruiemetns but cannot find where it states that dedicated transfer switches are required for non 517 type installations?
Article 700 Emergency Systems
- Thread starter Mike01
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- Lockport, IL
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- Semi-Retired Electrical Engineer
700.6(D) tells us you need at least two, in that the "emergency" transfer switch cannot supply "Legally Required Standby Loads" or "Normal Loads." I half expected to see a similar statement in 701, but I can't find it just at present.
Emergency vs Legally Required vs Optional
Emergency vs Legally Required vs Optional
yes I could not find this in 701 or 702 either, however in 700 it requires the feeders to originate from dedicated switchboard sections or separate disconnects so I would assume with that you could have up to three transfer switches. It is also interesting that in 700 it talks about emergency system circuits for lighting but then for power indicates that equipment "classed as emergency" however who defines what equipment is "classed as emergency"?
Emergency vs Legally Required vs Optional
yes I could not find this in 701 or 702 either, however in 700 it requires the feeders to originate from dedicated switchboard sections or separate disconnects so I would assume with that you could have up to three transfer switches. It is also interesting that in 700 it talks about emergency system circuits for lighting but then for power indicates that equipment "classed as emergency" however who defines what equipment is "classed as emergency"?
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
That answer appears at the beginning of the second paragraph within article 700.
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