It need not be exactly centered on the equipment, and working spaces of adjacent pieces of equipment may overlap. One. It is further stated that the disconnecting means are not to disconnect the branch circuits required in sections 620.22, 620.23 and 620.24. Suspending the cables from the supports by a means that automatically tightens around the cable when tension is increased for unsupported lengths up to 200 ft. An NEC Informational Note defines unsupported lengths. The elevator equipment room that serves a hydraulic elevator is almost always located on the lowest floor adjacent to the elevator shaft. You are a subscriber that needs to Sign In. The traveling cable, moreover, may be run without raceway from inside the hoistway to elevator-controller enclosures and to the elevator car and machine room and similar locations outside the hoistway for a distance not exceeding 6 ft. If a smoke detector goes into alarm, it signals the elevator to go into Fire Recall Function, at which point the controller directs the elevator cab to travel to its pre-programmed designated landing, open its doors, and remain stopped there until the alarm clears. They are to be part of listed equipment, a driving machine or a driving-machine brake. Because of this, there is often a communications gap between the electrical system designer, whose design typically stops at the required elevator disconnecting means, and the architect who designs the elevator system. Finally, in 1897, the first National Electrical Code (NEC) appeared. The Uniform Building Code requires two-way communications between the central command center and the elevators, each elevator lobby, emergency power rooms, and by entries into enclosed stairways (Section 403.5.3). Notwithstanding, if sprinklers are installed in hoistways, machine rooms or the like, the disconnecting means is permitted to automatically open the power supply to the affected elevator(s) prior to the application of water. The NEC rule specifies that the minimum size for paralleled conductors is 1/0 AWG, which is much too big for an elevator traveling cable. Hoistway door interlock wiring from the riser must be flame retardant and have insulation suitable for a temperature not less than 200C (392F), much higher than that required for most raceway or cable applications. Please check your entries and try again. The surest means of avoiding an arc-flash hazard is to lockout and tagout the electrical service to a controller. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. You can email the site owner to let them know you were blocked. As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. charlie b. Pits shall be maintained in a clean and dry condition. Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. If you can illuminate the pit using lights that are "above the top of the pit" (whatever that . In elevators provided with Firefighters' Emergency Operation, a drain or sump pump shall be provided. The condition is that all conductors must be insulated for the maximum voltage applied to any conductor within the cables or raceway system, and all live parts of the equipment must be insulated from ground for this maximum voltage. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. The proposals resulted in adding new requirements in the 2017 NEC for: This article will also discuss other Code requirements that include selective coordination for elevators that are supplied by emergency, legally required standby or critical operation power systems or multiple elevators supplied from a single feeder, and shunt tripping of elevators where the elevator equipment room and/or shaft has a fire suppression sprinkler system. We generally think of the 19th century as the great age of building codes. Firefighters can then use portable telephone handsets in combination with the jacks and cabling. He has focused on writing since 2006, having written for such magazines as ELEVATOR WORLD, Electrical Construction and Maintenance, Cabling Business, Electrical Business, Nuts and Volts, PV Magazine, Electrical Connection, Solar Connection, Solar Industry Magazine, Fine Homebuilding Magazine and Engineering News. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). Motor feeder short circuit and ground-fault protection must be as required in Article 430, Part V for all motors. On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. Follow the manufacturers instructions and precautions. Traditional wiring methods and materials come into play, as always, but it is necessary to rethink their deployment. Though I understand how someone might argue two. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. C.1.4 ELEVATOR PIT REQUIREMENTS 1. 2.2.6.1 This switch shall be so located as to be acces-sible from the pit access door. However, this can vary depending on building conditions and exterior grade. PK ! (ASME has a separate document, A18.1-2008 Safety Standard for Platform Lifts and Stairway Lifts). Hydraulic elevators comprise a hydraulic reservoir, pump, cylinder, and controller. The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. It is stated that traveling cables are to be suspended at the car and hoistway ends, or counterweight end where applicable, so as to reduce the strain on the individual copper conductors to a minimum. For elevators that regenerate power back into a power source unable to absorb the regenerative power under overhauling elevator load conditions, a means to absorb this power is to be provided. For example, wiring that is under exclusive utility control and has to do with the generation and distribution of electrical power is not NEC regulated. But, building codes had been in existence for many centuries. Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. wide or the width of the equipment, whichever is greater. As greater numbers of elevators are added, the likelihood of them all operating simultaneously decreases so that it is permissible to reduce the feeder ampacity. The disconnecting means is also to be a listed device. All rights reserved. Traveling cables are to be supported by one of these means: Looping the cables around supports for unsupported lengths less than 100 ft. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Adhering to the requirements will ensure a hazard-free electrical installation. Section 620.37 re-emphasizes that only wiring used in connection with the elevator is permitted within the hoistway, machine room, control room/machinery space or control space. While the definitions are straightforward, their deployment in real-life building projects involves enormous legal and moral implications, given the fact that we are carrying large numbers of people hundreds of feet above the earths surface on a daily basis. Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. f?3-]T2j),l0/%b Proper selective coordination in a multi-elevator installation on the same feeder ensures if one elevator develops a fault, the other units will not be shut down. proved for elevator locations - car, hoistway, pit and a-chine roo equireents in Article odify the articles in Chap - ter For eaple, it is stated that the cross-sectional area The sum of the cross-sectional area of the individual conductors in raceways is not to exceed 40% of the interior cross-sectional area of the raceway, except as permitted for wireways. Both electric and nonelectric elevators are to comply with Article 250, the code article that covers grounding and bonding in general. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. The code notes that elevator rails or other hoistway equipment are not to be used as the grounding conductor for lightning-protection systems. 1. Article 511 provides the requirements for commercial garages areas used for the storage or repair of self-propelled vehicles that use combustibles (liquid or gas) for power. Finally, typical installations and compliance with all these requirements will be discussed. The main impetus for the creation of the NEC in the closing years of the 19th century was the collective anguish experienced by insurance underwriters who were losing vast amounts of money due to liability and physical damage claims resulting from Edisons electrification of, first, Lower Manhattan and then the world. For all of this to come together in the real world, there had to be some assurance that these new technologies could be used safely on a wide scale. Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. All equipment in a machine room-less design is installed within the elevator shaft or exterior compartment near the elevator shaft, including the elevator controller and the elevator disconnecting means. (B) Lighting Switch. NEC Guidelines on Commercial Garages. -inch conduit is needed to the sump pump. The two documents are in harmony and should be used in conjunction. As they review the plans and the construction site, they may have conflicting interpretations or requirements. Other building loads, such as power and lighting, may function as the energy absorbing means, provided these loads are automatically connected to the emergency or standby power system operating the elevators and large enough to absorb the regenerative power. z!0: - [Content_Types].xml ( n0EUb*>-RxV=QUAl"93dFk%Y?l}MGDV Mobile, AL 36606 USA Main feeders that supply elevator power must be kept outside the hoistway unless one of the following applies: Feeders for elevators are permitted within an existing hoistway (provided they are not spliced within the hoistway) by special permission of the AHJ. The proposals resulted in adding new requirements in the 2017 NEC for: Marking the elevator controller short-circuit current rating (SCCR) by the elevator control-ler manufacturer. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. Conductors supplying more than one motor, motor controller or power transformer are to have an ampacity not less than the sum of the nameplate current ratings of the equipment plus all other connected loads. Instruments: Use category III multimeters and be familiar with their use and limitations. Elevator motors are inherently intermittent duty. Many professionals believe the NEC is applicable only for voltages over a certain level, but that is not the case.
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