- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Can anyone interpret this for me? I can't make any sense out of "emergency run mechanical starting."
695.7 Exception
- Thread starter charlie b
- Start date
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Buck Parrish
Senior Member
- Location
- NC & IN
You know the Handbook usually emphasizes something they think people may have a hard time with.
Well they, too did not write any thing extra other then the code's exception. Perhaps they weren't sure either.
I'll give it a go. Emergency Running pump could be a fire pump that is supplying sprinklers in a building . It is started mechanically say from a heat detector.
Well they, too did not write any thing extra other then the code's exception. Perhaps they weren't sure either.
I'll give it a go. Emergency Running pump could be a fire pump that is supplying sprinklers in a building . It is started mechanically say from a heat detector.
Say you need the pump in an emergency. The control circuit fails. There is an emergency start handle on the pumps That is independent of control circuits or other control devices.
texie
Senior Member
- Location
- Fort Collins, Colorado
- Occupation
- Electrician, Contractor, Inspector
As Hv&Lv said, this is a mechanical handle to force the contactor closed. Similar to a mechanical handle on an ATS. The voltage drop requirement does not apply when started in this manner.
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Buck Parrish
Senior Member
- Location
- NC & IN
Charlie, or any body, In this exception, would it make sense to use the word "manual" and not "mechanical" As ''mechanical can be used for an automatic or a manual system.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
In my opinion, no. "Manual" merely implies "requires human intervention," while "mechanical" implies "no power required."
texie
Senior Member
- Location
- Fort Collins, Colorado
- Occupation
- Electrician, Contractor, Inspector
Yes and a good example of this is with transfer switches. You can get manual mechanical transfer switches or (in larger sizes) you can get non-automatic that are controlled electrically.
- Location
- Illinois
- Occupation
- retired electrician
The " [20:9.4.2] " after the exception indicates that it is extracted material from NFPA 20. It is not permitted to be modified by the NEC technical committee when it is extracted from NFPA 20 and inserted into the NEC. Any change has to be made by a PI submitted to the technical committee for NFPA 20.
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