4/19/2023 0 Comments Primordia elevator code![]() ![]() (Cross-sectional areas of conductors are given in Chapter 9, Tables 5 through 8. For example, it is stated that the cross-sectional area of the individual conductors in a wireway are not to exceed 50% of the interior cross-sectional area of the wireway. Requirements in Article 620 modify the articles in Chapter 3. As we have seen, a limited number of these are approved for elevator locations – car, hoistway, pit and machine room. Beginning with Article 320, Armored Cable (Type AC) and concluding with Article 398, Open Wiring on Insulators, each code-sanctioned cable and raceway is treated, ranging from the familiar Type NM (trade name “Romex”) to the exotic Integrated Gas Spacer Cable (Type IGS). These are covered for generic, non-elevator specific use in earlier articles, 376 and 378, in Chapter 3, Wiring Methods and Materials. It begins by considering metal and nonmetallic wireways. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. Overcurrent devices protecting these branch circuits are to be located in the machine room or similar location. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. Here again, the lighting is not to be connected to a GFCI, whereas such protection is required for the receptacle(s).Īdditional branch circuits are to supply other utilization equipment not covered above. This is the area within the hoistway beneath the car, and there are occasions when elevator technicians have to work in this area for maintenance and troubleshooting. ![]() In contrast to the lighting, these receptacles must be connected to GFCI devices.Īnother location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. Furthermore, at least one 125-V, single-phase, 15- or 20-amp duplex receptacle is to be provided in each machine room or similar location. It is further specified the machine-room lighting switch be located at the point of entry. ![]() It is also essential that machine-room lighting be totally reliable and separate from the machinery supply to facilitate troubleshooting in the event of elevator problems. It is mandatory, as in the car, that these items have a separate, dedicated branch circuit, and the required lighting is not to be supplied through a GFCI. NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. A further requirement concerns elevator-car air-conditioning and heating. The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. The basic idea is that there must be a separate, dedicated circuit for car lights, receptacles and ventilation on each car. ♦ How unsupported lengths of traveling cables are measuredĪ section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. ♦ Where overcurrent protection for hoistway, pit and machine-room lighting must be located ♦ Which locations must have one or more duplex receptacles ♦ Which branch circuits are not to be provided with ground fault circuit interrupter (GFCI) pro-tection ♦ Which locations require sepa-rate, dedicated branch circuits Learning ObjectivesĪfter reading this article, you should have learned: We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. In Part One of this series (ELEVATOR WORLD, April 2012), we began an examination of National Electrical Code (NEC) 2011 mandates for elevators and related equipment installations. The conclusion of a series on the detailed examination of the National Electric Code’s impact on vertical transportation ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |