The disconnecting means is to be an externally enclosed, operable, fused motor circuit switch or circuit breaker capable of being locked in the open position. In all cases, the working space must permit at least a 90 opening of equipment doors or hinged panels. 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). CLAIMED . 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. Even non-composite fiber-optic cable, which does not carry electrical energy, is subject to the code. 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. ranged from 0.06 cal/cm2 to 0.95 cal/cm2, which indicates that the arc-flash hazard to employees is primarily to the hands and arms. 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. Where the elevator shaft and/or equipment room has a sprinkler fire suppression system installed, the elevator Code requires main line power to the elevator be removed prior to the application of water. Nevertheless, the primary NEC focus is on elevators, and the intention is to mitigate the hazards associated with the use of electricity. This may be countered by providing good machine-room ventilation. 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. Finally, typical installations and compliance with all these requirements will be discussed. Depending on your local codes, you can do this by installing heat or smoke detectors within 24 in. For elevators with battery lowering systems, an additional contact must be supplied and wired to disable the battery lowering system when the elevator disconnect is manually operated for maintenance. Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. The disconnecting means is to be located adjacent to or an integral part of the motor controller. It is important to note, that these selective coordination tables can indicate a lack of selective coordination at a given fault current for circuit breakers that do not show overlap on the time-current curves of the circuit breakers. 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. With the new elevator controller requirements, more attention will be focused on the elevator system. The architect has a choice of either traction or hydraulic elevators. The elevator controller manufacturer must determine the required elevator controller SCCR as stated in the elevator controller specification and provide an elevator controller SCCR that is equal to or greater than the available fault current thats indicated in the design documents where there are multiple elevator controllers at different locations. Personal protective equipment (PPE): Use appropriate PPE to protect body parts within the range of 3-16 in. +91 8025357028, 2022 Elevator World, LLC. In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. Related Code Sections 802.1.8 Indirect/Special Waste, Elevator Pit Drain or Sump Pump Mobile, AL 36606 USA from components that are not otherwise guarded. Hint: Duct Tape to the Rescue, NEC: Air Conditioning and Refrigerating Equipment Part 5. All rights reserved. Provide continuous, non -slip, horizontal rungs every 12" for the full height of the pit ladder. The new ADAAG guidelines now require that emergency power be available to elevators that have four or more stories of travel above or below the accessible floor [4.1.3(9)(1)]. Traction elevators raise and lower the elevator cab with cables, a pulley system, and counter weights powered by a motor at the main drive wheel. Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. 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. Follow the manufacturers instructions and precautions. You need to Subscribe to continuing reading. Something went wrong. Jul 15, 2021. You can email the site owner to let them know you were blocked. 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. APPENDIX A 2.2. A raceway that comes loose on the inside of a hoistway could catch on a moving car, causing immense damage and hazard to users. 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. NEC articles generally adhere to a template, which greatly aids in navigating and quickly locating mandates as needed for project design or, on an installation level, in the field. My reasoning comes from 620.24 (A) and (C). Any other utilization equipment associated with the elevator On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. The hazards are external to the equipment enclosure since equipment SCCR testing and evaluation criteria for product standards are most often performed with the enclosure doors closed and latched, and the fault occurring external to the enclosure. 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. Years may lapse between the design and installation stages of a project. 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. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. 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. Second, it must be configured so as to eliminate any chance of tangling or chafing against the inner surface of the hoistway or items mounted on it. Where necessary, it is mandated that suitable guards be provided to protect the cables against damage. 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. Below is a summary of these new 2017 NEC sections: In order to comply with these requirements a chain of events must occur. charlie b. 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. wide or the width of the equipment, whichever is greater. Besides the initial determination requirement of paragraph (c) (1), the "host" employer must comply with the five (5) requirements of paragraph (c) (8) when engaging another employer (contractor) who will have employees in permit spaces under the control of the host employer. Part VIII, Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces, states elevator and similar-installation driving machines, motor-generator sets, motor controllers and disconnecting means are to be installed in a room or space set aside for that purpose. A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. You are a subscriber that needs to Sign In. The reason the NEC CMP 12 added these requirements, as shown in the panel statements, directly relates to the concern that elevator controllers can be installed in locations where the available fault current can be high and the inspector may not be able to clearly determine the SCCR of the elevator controller unless it is marked on the equipment. 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. NEC 2011 Article 620.21(2)(b) states that hard-service cords and junior hard-service cords that conform to the requirements of Article 400 (Table 400.4) are permitted as flexible connections between the fixed wiring on the car and devices on the car doors or gates. The AHJ is saying that this is a violation of 620.23. 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. 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. The 12 definitions provided in NEC 2011, Section 620.2 are the place to start for guidance in this area, and the sections that follow lay out implementation guidelines that are very relevant in todays environment. Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. The traveling cable, of necessity, is exempted. A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. You are seeing this message for one of three reasons: You have reached your limit of free content. Dan Neeser is a Senior Field Application Engineer with Eatons Bussmann Division. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc A little more narrowly focused (yet of great consequence) is the ubiquitous NEC, which, in the National Fire Protection Association (NFPA)s venerable Handbook edition, devotes 18 double-column pages to electrical design and installation requirements for elevators, escalators and related equipment. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. 23.254.250.15 Cylinders in hydraulic elevators usually aren't suitable for buildings taller than five stories. Adhering to the requirements will ensure a hazard-free electrical installation. Similarly, the integrity of the traveling cable is emphasized. The light switch shall be located so to be accessible from pit access door. For example, wiring that is under exclusive utility control and has to do with the generation and distribution of electrical power is not NEC regulated. Fluid pressure in the cylinder raises and lowers the elevator cab. hbbd```b``+3dL `Y[gw9`RLJO*A$w$@L`F*{|0 P Examples of PPE that may be appropriate are non-conductive eye protection, clean leather or fire-resistant gloves, and natural-fiber or fire-resistant-rated long-sleeved shirts and pants, or fire-resistant-rated long-sleeved coveralls. He also required GFCI protection for the hard-wired sump pump that did not require it. If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. The light switch in the pit must be mounted 42 in. Part IX, Grounding, states that metal raceways, Type MC cable, Type MI cable or Type AC cable attached to elevator cars are to be bonded to metal parts of the car bonded to the equipment grounding conductor. (e) Pit Maintenance. This is especially true in an elevator shaft where measures have to be taken to ensure that a hazardous situation is not created. 1. Something went wrong. Part of the reason that elevator usage is extraordinarily safe is that construction and maintenance are regulated by the wonderfully robust ASME A17.1 2007/CSA B44-07 Safety Code for Elevators and Escalators, which contains overall construction and maintenance requirements everything from seismic mandates to machine-room lighting. Doors must open in the direction of travel and be equipped with panic bars, pressure plates or other devices that are normally latched but open under simple pressure. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). 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. Moreover, it is necessary to consider future worker safety for an indefinite period. After reading this article, you should have learned about: The meanings of definitions for control room and control space versus machine room The purpose and specifications for working spaces Insulation types and minimum sizes of conductors Requirements for feeder and branch-circuit conductors Feeder demand factors for ele-vators. 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. Conductors supplying a single motor controller are to have an ampacity not less than the motor controller nameplate current rating plus all other connected loads. Get directions, reviews and information for Eazylift Albany LLC in Latham, NY. Hydraulic elevator installations are typically supplied from the main switchboard and have an elevator fused switch or circuit breaker in the machine room that serves as the elevator disconnect. You need at least one 120VAC GFCI-protected receptacle at each location. Also located in this room might be, but not limited to: exhaust fan, cooling unit (depending on local requirements and/or requirements set forth by the individual elevator supplier), lighting, voice and/or data drop serving the elevator cab emergency phone, elevator controller primary fused disconnect, elevator feeder shunt-trip circuit (i.e., shunt-trip circuit breaker), elevator cab lighting fused switch, and convenience receptacle(s). Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. ), advise the building owner to correct the condition. 3. 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. A few years later, in 1880, Werner von Siemens built the first electric elevator, setting the stage for a new industry that would change the world by making the practical use of tall buildings possible. Use the below learning-reinforcement questions to study for the Continuing Education Assessment Exam available online at www.elevatorbooks.com or on page 81 of this issue. Which equipment requires a separate branch circuit in the elevator car? Is lighting required to be GFCI protected in the machine room? Where is the lighting switch to be located in the machine room? What is the maximum raceway conductor fill in an elevator hoistway? How many disconnecting means are required for an elevator power supply? 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. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. To achieve flexibility and endurance, traveling cable is more finely stranded and, where possible, separated into discrete conductors. 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 Corporate Office The fan should be on a dedicated circuit. But by understanding how these items fit together and what purpose they serve, you can have a successful project. 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 demand factor ranges from 1.00 for one elevator on a single feeder to 0.72 for 10 or more elevators on a single feeder. If it kills the son of the owner, the son of that builder shall be put to death.. 2.2.2.6 . 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.. 988 0 obj <>stream Elevator cab lights require emergency back-up power. Traditionally, the electrical system design engineer has given little attention to the elevator controller. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. +;-mka|7! 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 NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. 836 Troy Schenectady Road Latham, NY 12110 . 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. The code exempts some fairly broad areas where compliance is not expected. 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. NEC specifies Hoistway wiring, and doesn't seem to distinguish between hoistway and pit. Section 620.43, Location of and Protection for Cables, provides that traveling cable supports are to be located so as to reduce the possibility of damage due to the cables coming in contact with the hoistway construction or equipment in the hoistway to a minimum. When you're designing an electrical system for a building, don't let elevator requirements bring you down. Feeder and branch-circuit conductors are required to have specified ampacities: Feeder conductors of less ampacity are permitted for group installations and quite common in elevator work. Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. The same figure applies to nonmetallic wireways. It is worth mentioning that when 600 V is talked about as a limit in the NEC, it is generally meant that the familiar 600-V nominal-voltage system is considered to lie within the permitted zone, making it a common usage. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. In hoistways not longer than 6 ft., these additional wiring methods are permitted: A sump or oil-recovery pump located in the pit is permitted to be cord connected. The feeder OCPD needs to remain closed so the remaining elevators have power and continue to function. For example, an inadequately supported ceiling fan could fall and cause injury or property damage. The conductors must be in their original sheaths or grouped together and taped or corded. A traditional elevator installation (which includes a machine room) requires access inside the elevator shaft. The two primary hazards are fire and electric shock or arc flash, although there are others. 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. Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. 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. Many of these are for portable lighting.). But the lights don't have to be in the pit itself. Here, the National Electrical Safety Code has jurisdiction. Mike Holt. 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. They are to be part of listed equipment, a driving machine or a driving-machine brake. Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. 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. In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation. NEC Article 620 covers elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts. Special conditions: Troubleshooting in wet, hot or cold conditions calls for extra caution. Use Underwriters Laboratories or Canadian Standards Association-labeled scopes tested for 1,000 V. Lockout/tagout: When troubleshooting is complete and further work can be accomplished without the equipment being energized, follow the lockout/tagout procedures in Section 7 of the. NEC Article 0: Elevator art by David Herres Continued. The cover shall be secured and level with the pit floor. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. The basic requirement is for minimum clear distances of various depths for equipment operating at 600 V or less, nominal, depending upon voltage to ground and lateral distance to insulated or grounded surfaces or exposed live parts (not an issue in elevator machine rooms). . If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. The code is not concerned with the efficiency or sophistication of equipment that it covers, except insofar as safety (in terms of human injury and property damage) is concerned. They must be in enclosures with doors or removable panels that can be locked in the closed position. !>x=yy Bvv8?~e PK ! Mobile, AL 36606 USA Loss of voltage to the control circuit for the disconnecting means shall cause a supervisory signal to be indicated at the control unit and required remote annunciation. Limit switches placed throughout the height of the shaft communicate with the controller and stop the cab at each landing. Each of these performs a different function, and the wiring mandates vary accordingly. Firefighters can then use portable telephone handsets in combination with the jacks and cabling. Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. 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. In these installations, it is best to design the elevator controller so the elevator controller SCCR is adequate for the available fault current. Cloudflare Ray ID: 7a2fbe9ebd7e2fe8 We have circuited the receptacles and lights in the pits to the same circuit. 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. David Herres holds a New Hampshire Master Electricians license and has worked as an electrician in the northern part of that state for many years. In an elevator machine room, where space may be limited in the first place, the working-space mandate must be factored in very early in the design process lest an unthinkable amount of rework be necessary. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. above the seal plate, adjacent to the ladder. The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. 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. h-`7 It does specify wiring methods allowed, though, in 620. 836 Troy Schenectady Road ; Latham, NY 12110 . This accomplishes two functions. 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. 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. 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. To address this issue, Code Making Panel (CMP) 12 of the National Electrical Code acted on several proposed changes to Article 620 during the revision cycle for the 2017 NEC that deal with the proper installation of elevator controllers. Metallic articles: Remove metallic articles such as watches, chains, bracelets, earrings, belt buckles and keychains before troubleshooting. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. 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.
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