A surge of immigration to the U.S., the end of slavery and, on both sides of the Atlantic Ocean, a burgeoning industrial revolution ignited an acceleration in new building. Traveling cables are to be supported by one of these means: Looping the cables around supports for unsupported lengths less than 100 ft. You'll be responsible for specifying the items related to the fire alarm and some controls, as well as supplying lighting and power to the equipment room and elevator pit. This is because the material may contribute fuel to a fire that has originated elsewhere. Bonding of elevator rails to a lightning-protection system grounding conductor is permitted, but the conductor itself is not to be located in the hoistway. Traditional wiring methods and materials come into play, as always, but it is necessary to rethink their deployment. Elevators with driving machines located on the car or counterweight, or in the hoistway are permitted outside the specified spaces. For circuit breakers, time-current curves must be consulted as well as the circuit breaker manufacturers selective coordination tables. Therefore, there will be two signals to the elevator control panel related to smoke detectors: one from the designated floor smoke detector and another combined signal from the smoke detectors at the other lobby landings and in the equipment room. However, space is frequently limited within the shaft and as such many ancillary components (shunt trip circuit breakers, fused disconnects) may need to be located outside of the elevator shaft. As recommended in NFPA 70E, the National Elevator Industry, Inc. (NEII) commissioned an arc-flash hazard analysis (in compliance with IEEE Standard 1584-2002 for procedures for calculating the incident energy of the arc flash) by an independent consultant to determine at what level an arc-flash hazard exists to employees who work on energized elevator equipment. NEC specifies Hoistway wiring, and doesn't seem to distinguish between hoistway and pit. The surest means of avoiding an arc-flash hazard is to lockout and tagout the electrical service to a controller. Next, with multiple elevator banks, the controller will usually allow only one elevator at a time to operate, reducing the amount of emergency power required. If the smoke detector at the designated landing goes into alarm, the elevator will stop at a predetermined alternate floor, which is usually the floor above the designated floor. Machine room/control space lighting and receptacles 4. Conductors supplying a single motor are to have an ampacity not less than the percentage of motor nameplate current determined from Section 430.22(A) and (E). The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. IAEI News Magazine. The disconnecting means is also to be a listed device. Machine room-less elevator installations incorporate the elevator controller and often the primary disconnecting means in a convenient package that is located within the elevator shaft. ELECTRIC PASSENGER & FREIGHT ELEVATORS ASME A17.1 2004 Electric Elevator Checklist 2004 Multi-car.doc Page 4 of 44 Page Completed for cars : - Last Updated: 8/1/05 Car Enclosure Electric 2.14 - Hydraulic 3.14 A17.1 (A17.2) COMMENTS CARS 1-6 Operating Control Devices ADA Requirements Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. You can email the site owner to let them know you were blocked. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. Elevator motors are inherently intermittent duty. One way to achieve this is by paralleling wires, i.e., connecting the runs at both ends so they are physically like two wires but electrically one. From the website: Mohawk Lifts offers car lifts and auto lifts for purchase, including 2 post lifts, 4 post lifts, storage lifts, heavy duty mobile column lifts, parallelogram lifts, and other specialty items. Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. Part X, Emergency and Standby Power Systems, is simple and straightforward. The panel further clarified that the marked SCCR value must be adequate for the available fault current to ensure a safe installation. While machine room-less designs have been commercially available for many years, their use may still be unknown to some AHJs. These are the individual branch circuits required for car lighting, receptacles, auxiliary lighting and ventilation on each elevator car; individual branch circuits for machine-room and similar location lighting and receptacle; and branch circuits for hoistway pit lighting and receptacle(s). Every building is different. First, the ATS signals the elevators that it's about to switch over to emergency power preferably 30 sec or more prior to switching, which allows the elevator controller to bring each elevator cab to the nearest landing and stop, thus protecting the motors and electrical system. The lighting switch shall be located so as to be readily accessible from the pit access door. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. Because they need to move and flex, traveling cables are not required to be in a raceway. These may include: The author would like to recognize Jonathan Kennedy for his assistance in creating this article. This switch will ensure that the elevator won't descend into the elevator pit and allow maintenance people to work safely in the area beneath the cab. Some elevator controller manufacturers believe this is an issue for the electrical system designer and installer to address and remedy by adding impedance to the system for lowering the available fault current. Overcurrent devices protecting these branch circuits are to be located in the machine room or similar location. The traveling cable or raceway is also permitted to include shielded conductors and/or one or more coaxial cables. Therefore, elevator equipment rooms must maintain a temperature between 50F and 90F. To achieve flexibility and endurance, traveling cable is more finely stranded and, where possible, separated into discrete conductors. You are seeing this message for one of three reasons: You have reached your limit of free content. Of particular importance is the location of the disconnecting means so it can be found by an individual who may not be familiar with the installation. Reinforcing NEC 110.3(B) and NEC 110.10 to require the elevator controller marked SCCR to be equal to or greater than the calculated and Flexible cords and cables (same conditions as within hoistways). It is of great importance that power to the various elevator functions can be quickly and reliably removed from the loads in case of emergency or for maintenance and troubleshooting. Cables used in Class 2 power-limited circuits are permitted between risers and signal equipment and operating devices, provided they are supported and protected from physical damage and are of the jacketed and flame-retardant type. He also required GFCI protection for the hard-wired sump pump that did not require it. No provision is to be made to automatically restore power. (All intentionally grounded elements must be held at equal potential.) The most complex of these is the elevator. 1. Marking the elevator controller short-circuit current rating (SCCR) by the elevator controller manufacturer. You are seeing this message for one of three reasons: You have reached your limit of free content. Such vehicles include, but are not . Many undertake trips in these devices two or more times daily in full confidence that they will survive an uneventful experience with a minute chance of disaster or even inconvenience. These are covered for generic, non-elevator specific use in earlier articles, 376 and 378, in Chapter 3, Wiring Methods and Materials. (f) Illumination of Pits. All rights reserved. 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. The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. In these installations, it is best to design the elevator controller so the elevator controller SCCR is adequate for the available fault current. It does specify wiring methods allowed, though, in 620. Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. The code notes that elevator rails or other hoistway equipment are not to be used as the grounding conductor for lightning-protection systems. It is further stressed that no provision is to be made to open or close the disconnecting means from any other part of the premises. (e) Pit Maintenance. 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. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Motor controllers are permitted outside the spaces specified above. The demand factors are given in Table 620.14, which allows significant reductions as the number of motors is increased. Use the below learning-reinforcement questions to study for the Continuing Education Assessment Exam available online at www.elevatorbooks.com or on page 111 of this issue. Name the principal code other than NEC that pertains to elevator design/installation. What is the definition of the machine room? Why are voltage limitations important? In which areas must live parts be enclosed? Why are feeder demand factors permitted for multiple elevators? The fan should be on a dedicated circuit. Sumps and sump pumps in pits, where provided, shall be covered. Additional requirements concern escape routes. NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. They are to be located so as to be protected from physical damage, are to be of a flame-retardant type, and must be part of listed equipment, a driving machine or a driving-machine brake. 836 Troy Schenectady Road Latham, NY 12110 . The conduit alone can't act as the grounding means. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. 2m9 `K]f*F gaR 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. [emailprotected] They are to be part of listed equipment, a driving machine or a driving-machine brake. Three wiring categories within hoistways are allowed in addition, each with exceptions. Traveling cables are to be approved for hazardous locations and must comply with the appropriate sections for each hazardous-location class that covers use of flexible cords. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). 68 | WWW.ELEVATORWORLD.COM | June 2012 Continuing Education . GFI Receptacles: GFI receptacles shall be required in all elevator machine rooms, machinery spaces and elevator pit areas. Instruments: Use category III multimeters and be familiar with their use and limitations. Get more of Elevator World. For some manufacturers, such as Eaton, testing has been completed to determine the selective coordination ability of current-limiting BussmannTM series fuses with upstream Eaton circuit breakers. Acceptable types of wire for this application are given in Table 400.4, which occurs in an earlier chapter and lists various types of elevator cable for lighting and control in both unclassified and hazardous locations. Here are 23 ways that both chapters and the national office can meet todays major challenge of making members feel valued, IAEIs Online Training allows you to learn at your own pace or live with an expert instructor, from the comfort of your laptop or PC. (B) Lighting Switch. It is important, where mandated, that there be no more than a single disconnecting means, so if emergency action is required, first responders will not be able to power down the equipment from one location. . The basic wiring methods are rigid-metal, rigid nonmetallic or intermediate-metal conduit; electrical metallic or rigid nonmetallic tubing; wireways; or Type MC, MI or AC cable, unless otherwise permitted. 6 feet, and shall meet the requirements of NEC 70 620.21(A)(1)(d). We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. Below is a summary of these new 2017 NEC sections: In order to comply with these requirements a chain of events must occur. We shall now take a look at the principle requirements of Article 620, with particular emphasis on wiring requirements for elevator shafts, machine rooms and cars. A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. ), a duplex 15A 120-volt receptacle in pit with ground- fault circuit protection and a 15A 120-volt Non GFCI receptacle for the sump pump. Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. The idea is quite simple. Selective coordination is defined by the NEC as: Localization of an overcurrent condition to restrict outages to the circuit or equipment affected, accomplished by the selection and installation of overcurrent protective devices and their ratings or settings for the full range of available overcurrents, from overload to the maximum available fault current, and for the full range of overcurrent protective device opening times associated with those overcurrents.. Thus, the traveling cable must be supported by a steel supporting member. +90 (216) 348 4876, India Office It is of great importance for the design engineer to communicate with their local authority having jurisdiction (AHJ) to determine fire alarm requirements for the respective elevator installation. This position paper is written to provide guidance to members whose employees are engaged in elevator-industry work that might expose them to arc-flash hazards, and to assist members in complying with applicable OSHA and National Fire Protection Association (NFPA) standards. You must run a separate insulated grounding conductor with the feeder conductors from the electrical source to the elevator controller. q!^mDtsnEX3_ shvqu+X9@w3gSj`g 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.