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Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. Something went wrong. 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. All Rights Reserved | Contact Us | Privacy Policy. These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). 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. Provide continuous, non -slip, horizontal rungs every 12" for the full height of the pit ladder. (A) Separate Branch Circuit. The fan should be on a dedicated circuit. Moreover, because motors have a higher starting current than other loads, the overcurrent protection protocol is unique to them and somewhat counterintuitive. A further requirement concerns elevator-car air-conditioning and heating. The next section, 620.36, concerns different systems in one raceway or traveling cable. If a hydraulic elevator loses power because a heat detector goes off or for any other reason it could trap occupants for an unpleasant amount of time. Corporate Office As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. Selective coordination is also required for multiple elevators per NEC 620.62. h-`7 836 Troy Schenectady Road ; Latham, NY 12110 . Cross-sectional areas of wireways are found by multiplying the two interior dimensions.) While machine room-less designs have been commercially available for many years, their use may still be unknown to some AHJs. Indeed, most elevator accidents involve maintenance workers, yet even theirs is not an excessively dangerous profession. One. charlie b. The article stands apart from the rest of the code in the sense it exempts these categories of circuits from the general requirements for wiring in most occupancies, found in Chapter 3. Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. Working spaces for electrical equipment that may have to be examined, adjusted, serviced or maintained is required in all occupancies in an earlier NEC section, 110.26(A). NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. !>x=yy Bvv8?~e PK ! The light switch shall be located so to be accessible from pit access door. Convenience receptacles and lighting for maintenance purposes are required at the base of the pit and, in some instances (elevator manufacturer dependent), at the top of the elevator shaft. NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. 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. Pits shall be maintained in a clean and dry condition. Elisha Otis safety elevator, introduced in 1853, prevented the fall of the car if the cable broke. I've never run into this before. This will normally require you to vent the room with a fire/smoke damper and include smoke detector signals in the control logic. (e) Pit Maintenance. Mainline disconnect: DO NOT OPEN THE MAINLINE DISCONNECT SWITCH COVER unless employees are authorized, properly trained and appropriate measures are taken commensurate with the higher risk of arc-flash hazards. And so the needs can be very different. 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). If we fast forward more than 36 centuries, we see some important new developments in elevator technology. Weight (passengers, freight, car and attendant machinery) may be fairly substantial, and speed is significant. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. wide or the width of the equipment, whichever is greater. This is something that can be easily accomplished if the elevator controller manufacturer uses components in combination with overcurrent protective devices that are tested and listed with high combination SCCRs. The various items to consider and check when designing for elevator installations have many potential pitfalls. +1-251-479-4514 | [emailprotected], Trkiye Office ASME A17.1 . In such cases, it's economically justifiable to specify a traction type elevator. Metal grating shall be installed over the hole that sits flush with the pit floor. Flexible cords and cables that are components of listed equipment and used in circuits operating at 30 V (42 VDC) or less are permitted in lengths not to exceed 6 ft., provided the cords and cables are supported and protected from physical damage and are of a jacketed and flame-retardant type. Liquid-tight flexible nonmetallic conduit, Flexible cords and cables, or conductors grouped together and taped or corded, are permitted without raceway, where they are part of listed equipment, a driving machine or a driving-machine brake, Flexible metal conduit, liquid-tight flexible metal or nonmetallic conduit, 3/8 in. Related Code Sections 802.1.8 Indirect/Special Waste, Elevator Pit Drain or Sump Pump [emailprotected] Something went wrong. For just $7.99 per month, you can gain access to more than 5,000 articles from all Elevator World Publications, this includes EW Global, EW Europe, EW India, EW Middle East, EW Turkey, and EW UK. If elevators are supplied by the emergency, legally required standby or critical operation power systems, then selective coordination is required per the 2017 NEC in 700.32, 701.27 or 708.54. q!^mDtsnEX3_ shvqu+X9@w3gSj`g . Here, the National Electrical Safety Code has jurisdiction. 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. ASME A17.1, Section 2.2.5, National Electrical Code, Rule 620-85 4. The lighting switch shall be located so as to be readily accessible from the pit access door. Many new buildings are incorporating an elevator design that does not include an equipment room (sometimes called machine room-less elevators). 354 Morgan Ave. (C) Duplex Receptacle. 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? Mike Holt. Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. or larger is permitted to be installed in lengths in excess of 6 ft. Where motor-generators, machine motors or pumping-unit motors and valves are located adjacent to or underneath control equipment and provided with extra-length terminal leads not exceeding 6 ft. in length, such leads are permitted to be extended to connect directly to controller terminal studs without regard to carrying-capacity requirements. 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. or larger, not exceeding 6 ft. in length, are permitted between control panels and machine motors, machine brakes, motor-generator sets, disconnecting means and pumping motors and valves. Freight Elevator Door Control: An Opportunity for Wireless Technology. Click to reveal 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. Every building is different. Utility-owned electrical structures not directly concerned with electrical generation, transmission and distribution are NEC regulated. The demand factors are given in Table 620.14, which allows significant reductions as the number of motors is increased. 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. 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. 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 are a subscriber that needs to Sign In. The AHJ is saying that this is a violation of 620.23. (Cross-sectional areas of conductors are given in Chapter 9, Tables 5 through 8. All rights reserved. It is important for the design engineer to coordinate with the architect to determine the elevator manufacturer basis of design to determine if and when additional power and lighting is required. The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. 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). A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. 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. After reading this article, you should have learned: Which locations require sepa-rate, dedicated branch circuits Which branch circuits are not to be provided with ground fault circuit interrupter (GFCI) pro-tection Which locations must have one or more duplex receptacles Where overcurrent protection for hoistway, pit and machine-room lighting must be located How unsupported lengths of traveling cables are measured. Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] The party responsible for procuring the elevator control panel must state the minimum acceptable SCCR or the maximum available fault current where the controller will be installed. In case of emergency, electricians, maintenance personnel and any elevator technicians called in to the premises should have ready access to the key. Motor controllers are permitted outside the spaces specified above. +;-mka|7! For circuit breakers, time-current curves must be consulted as well as the circuit breaker manufacturers selective coordination tables. ) > word/_rels/document.xml.rels ( N0HC;qRN/W$#{1EM]ZY|vj5h),-g!`./V/KKFY4D#la&V#=$Q7|l/d#hS 7+IDZ!J 6KucD^s`+>=(3E %PDF-1.5 % Flexible cords and cables, or conductors grouped together and taped or corded, are permitted to be installed without a raceway. You must locate this key switch at the main lobby or at the building fire command center. 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. Thus, the traveling cable must be supported by a steel supporting member. 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. . It is further stipulated that internal voltages of power-conversion equipment and functionally associated equipment, and the operating voltages of wiring interconnecting the equipment, are permitted to be higher, provided that the equipment and wiring are listed for the higher voltages. 68 | WWW.ELEVATORWORLD.COM | June 2012 Continuing Education . Modern electronic elevator controls can be sensitive to temperature shifts. Specifically, Section 725.43 provides that overcurrent protection for conductors 14 AWG and larger is to be provided in accordance with the conductor ampacity without applying ampacity adjustment and correction factors. If it kills the son of the owner, the son of that builder shall be put to death.. To safeguard the passengers and electrical equipment, ASME A17.12.8.2.3.2 requires the power source to the elevator control panel to shut down prior to the discharge of water from a sprinkler head. 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. Because of this, several manufacturers offer an all-in-one shunt trip elevator disconnect switch that includes all the prewired accessories needed to comply with the various Code sections. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location David Herres David Herres holds a New Hampshire Master Electrician's license and has worked as an electrician in the northern part of that state for many years. All of these options and special wiring can be challenging depending upon the location of the shunt trip circuit breaker as well as who has responsibility for providing these additional options. 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. As for height, the working space must extend from the grade, floor or platform to 6-1/2 ft. or the height of the equipment, whichever is greater. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. Regardless of the number of elevators, only one smoke detector is required at each floor lobby, but it must be located within 21 ft of every elevator door. For platform lifts and stairway chairlifts, the duty is intermittent. This is not the elevator companys responsibility. Traction elevators are typically installed in a bank of elevators where fused switches, or circuit breakers in a panelboard are located in the machine room serving the bank of elevators. +91 8025357028, 2022 Elevator World, LLC. In elevators provided with Firefighters' Emergency Operation, a drain or sump pump shall be provided. Though I understand how someone might argue two. An exception provides that liquid-tight flexible metal conduit or liquid-tight flexible nonmetallic conduit 3/8 in. Such vehicles include, but are not . The panel further clarified that the marked SCCR value must be adequate for the available fault current to ensure a safe installation. No provision is to be made to automatically restore power. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. 2023 Endeavor Business Media, LLC. Get directions, reviews and information for Eazylift Albany LLC in Latham, NY. A traditional elevator installation (which includes a machine room) requires access inside the elevator shaft. The conductors must be in their original sheaths or grouped together and taped or corded. Corporate Office The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). The code notes that elevator rails or other hoistway equipment are not to be used as the grounding conductor for lightning-protection systems. 953 0 obj <> endobj If this is not done and the available fault current exceeds the elevator controller SCCR, other solutions to reduce fault current must be reviewed or equipment changes and field evaluations may be needed. Smoke detectors, which are required in all elevator lobbies and elevator equipment rooms, must be connected to the elevator controllers directly by means of auxiliary contacts and wiring, or indirectly by means of output signals from the fire alarm control panel. Metallic articles: Remove metallic articles such as watches, chains, bracelets, earrings, belt buckles and keychains before troubleshooting. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. All elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. The electrical system designer calculates the maximum available fault current at the elevator controller. GFI Receptacles: GFI receptacles shall be required in all elevator machine rooms, machinery spaces and elevator pit areas. Hazards created by water, snow or condensation in the work area can cause slips, falls and accidental contact. Besides the power-supply disconnect discussed, it is provided that elevators have a single means for disconnecting all ungrounded car lights, receptacles and ventilation power-supply conductors for that elevator car. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. Other codes and standards interact with the NEC, and it is necessary to see how they all work together in order to create safe and compliant elevator designs/installations. Dec. 21, 2010. For current-limiting fuses, the information to achieve selective coordination has been available for many years in fuse amp ratio tabular form. Here again, the lighting is not to be connected to a GFCI, whereas such protection is required for the receptacle(s). 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. You'll need to run telephone cables to the equipment room control panel, but the elevator supplier will take care of getting the cables to the elevator cab. This may include wiring for signals, communication with the car, lighting, heating, air-conditioning and ventilation of the car or hoistway for fire-detecting systems and pit sump pumps. For example, an inadequately supported ceiling fan could fall and cause injury or property damage. Requirements in Article 620 modify the articles in Chapter 3. This strategy works to improve the flexibility of the traveling cable, but it is contrary to a general NEC rule concerning the paralleling of conductors, which is generally done in very large sizes to avoid unwieldy wire pulls and terminations. But, building codes had been in existence for many centuries. Based on the analysis, the arc-flash boundaries at the elevator/escalator controllers ranged from 3-16 in. Elevator motors are inherently intermittent duty. from components that are not otherwise guarded. The electrical energy does not traverse the human body, but proximity to the explosion means severe injury is possible from the intense heat and concussive shockwave. You need to Subscribe to continuing reading. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. This room is to be secured against unauthorized access (kept locked). Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. Marking the available short-circuit (fault) current on the controller by the equipment installer. The two documents are in harmony and should be used in conjunction. The code exempts some fairly broad areas where compliance is not expected. 6 Stop Switch in Pits There shall be installed in the pit of each elevator an ASME A17.1 CODE enclosed stop switch or switches meeting the requirements The following material is reprinted with permission from the American of 2.26.2.7 and 2.2.6.1 through 2.2.6.3. endstream endobj 954 0 obj <. , !! Heating and air-conditioning equipment located on the car must not be in excess of 600 V. All live parts of electrical apparatuses are to be enclosed to protect workers and the public against accidental contact. Notice the definition mentions the full range of operating times. Where a feeder powers more than one elevator, you need selective coordination; the OCPDs must be series-designed so a fault at one of the elevators will be cleared by only the OCPD serving it. With the elevator car at the bottom landing, it is the length of cable as measured from the point of suspension in the hoistway to the bottom of the loop. or larger, not over 6 ft. in length. Conductors supplying a single power transformer are to have an ampacity not less than the nameplate current rating of the power transformer plus all other connected loads. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. The light switch in the pit must be mounted 42 in. Nevertheless, the primary NEC focus is on elevators, and the intention is to mitigate the hazards associated with the use of electricity. As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. When you're designing an electrical system for a building, don't let elevator requirements bring you down. Additional requirements concern escape routes. It states an elevator is permitted to be run by an emergency or standby power system. You need to Subscribe to continuing reading. They are differentiated from other similar structures by the fact that they are not attached to the outside perimeter or surface of the walls, ceiling or floor of the hoistway. Your elevator supplier will take care of all the wiring and related code requirements for the elevator cab and the various controls. In many cases, the overcurrent protective devices that are suitable for this level of protection are current-limiting fuses rather than a traditional circuit breaker. Generally, it is decreed that the supply voltage is not to exceed 300 V between conductors (allowing for the familiar 240-V concept), although there are exceptions. 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. hbbd```b``+3dL `Y[gw9`RLJO*A$w$@L`F*{|0 P To achieve flexibility and endurance, traveling cable is more finely stranded and, where possible, separated into discrete conductors. 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. Therefore, elevator equipment rooms must maintain a temperature between 50F and 90F. These are the principle NEC 2011 Article 620 mandates. 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. 2.2.6.1 This switch shall be so located as to be acces-sible from the pit access door. The light switch for the equipment room must be adjacent to the entrance door on the latch side. He had been with Eaton (Cutler-Hammer and Bussmann) since 1993 and specializes in training on the design and application of overcurrent protective devices and equipment in electrical distribution systems in accordance with the National Electrical Code and equipment in accordance with the various product standards.

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