You are seeing this message for one of three reasons: You have reached your limit of free content. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. Good documentation is of key importance to recalling what decisions were made and why. Hydraulic elevators are typically more cost effective and used for buildings up to 5-6 stories. ), 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. First, it is now clear that elevator controllers must be marked by the manufacturer with their SCCR. A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. For example, an inadequately supported ceiling fan could fall and cause injury or property damage. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. 836 Troy Schenectady Road ; Latham, NY 12110 . And as the designer, you can become the fulcrum on which all of these requirements and authorities exert their leverage, but an understanding of elevator basics can help you handle the pressure. Sign up for our free e-newsletter. He also required GFCI protection for the hard-wired sump pump that did not require it. High-rise buildings pose additional concerns. Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. 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. Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. Another important electrical system design consideration for supplying power to multiple elevators is NEC 620.62. He participates in IEEE (Senior Member) with Industrial and Commercial Power Systems, NEMA (member of the Codes & Standards Committee), NFPA (committee member for NEC CMP-13 and NFPA 79), UL (508/60947 and 508A) and IAEI activities. If the building has emergency power available, use it to supply the cab lights. 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. 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. 974 0 obj <>/Filter/FlateDecode/ID[<64E135C225F1064D91BC8119D14516A9>]/Index[953 36]/Info 952 0 R/Length 105/Prev 204101/Root 954 0 R/Size 989/Type/XRef/W[1 3 1]>>stream As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. We have circuited the receptacles and lights in the pits to the same circuit. In this case, it may be best if the elevator controller manufacturer does not include the elevator disconnecting means (often offered as a circuit breaker) but instead have the installer provide a separate fused disconnect to comply with NEC 620.51(A) and also achieve a high SCCR for the elevator controller when fuses are provided as specified by the elevator controller and marked on the elevator controller nameplate. 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. The thinking behind this requirement is that the injured worker could have severe hand burns and be unable to operate a conventional doorknob. Frequently Encountered Items That Delay Accep Tance of New Elevators 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. above the seal plate, adjacent to the ladder. Something went wrong. The most complex of these is the elevator. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. Motor feeder short circuit and ground-fault protection must be as required in Article 430, Part V for all motors. CLAIMED . 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. Design practices that are acceptable in some jurisdictions may not be in others. 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. Your Quick and Easy Elevator Code Checklist | Kings III 4.0 (2 Reviews) (2) CLAIMED . All rights reserved. This is because the material may contribute fuel to a fire that has originated elsewhere. Where multiple driving machines are connected to a single elevator, there is to be one disconnecting means to disconnect the motor(s) and control-valve-operating magnets. 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. Adhering to the requirements will ensure a hazard-free electrical installation. 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 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. A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. You need to Subscribe to continuing reading. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Recommendations for EazyLift Elevators, Stairlifts, Wheelchair Lifts Follow the manufacturers instructions and precautions. Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. The floor specified as the designated landing, which must be approved by the Fire Marshal, is usually the floor on grade level so passengers can quickly exit to the outside. 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. A separate branch circuit shall supply the hoistway pit lighting and receptacle (s). Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. 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. In contrast to the lighting, these receptacles must be connected to GFCI devices. (e) Pit Maintenance. Please check your entries and try again. Therefore, elevator equipment rooms must maintain a temperature between 50F and 90F. This is important as the tradition of using only time-current curves for the analysis of overcurrent device operation is usually not sufficient since the time-current curves traditionally stop at 0.01 second (not time zero). Through numerous editions, the NEC has, to a great extent, mitigated the hazards accompanying widespread use of electricity, particularly with respect to elevator technology. Weight (passengers, freight, car and attendant machinery) may be fairly substantial, and speed is significant. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. Fuses: Verify that the correct size, type and capacity are installed. As they review the plans and the construction site, they may have conflicting interpretations or requirements. For platform lifts and stairway chairlifts, the duty is intermittent. 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 various items to consider and check when designing for elevator installations have many potential pitfalls. 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. Such vehicles include, but are not . These may include: The author would like to recognize Jonathan Kennedy for his assistance in creating this article. For just $7.99 per month, you can gain access to more than 5,000 articles from all Elevator World Publications, this includes EW Global, EW Europe, EW India, EW Middle East, EW Turkey, and EW UK. We shall now take a look at the principle requirements of Article 620, with particular emphasis on wiring requirements for elevator shafts, machine rooms and cars. Some elevator controller manufacturers believe this is an issue for the electrical system designer and installer to address and remedy by adding impedance to the system for lowering the available fault current. It is also worth mentioning that the stated purpose of the NEC is the practical safeguarding of persons and property from hazards arising from the use of electricity. Freight Elevator Door Control: An Opportunity for Wireless Technology. The demand factor ranges from 1.00 for one elevator on a single feeder to 0.72 for 10 or more elevators on a single feeder. Selective coordination is also required for multiple elevators per NEC 620.62. Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. Section 620.37 re-emphasizes that only wiring used in connection with the elevator is permitted within the hoistway, machine room, control room/machinery space or control space. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. The Uniform Building Code requires two-way communications between the central command center and the elevators, each elevator lobby, emergency power rooms, and by entries into enclosed stairways (Section 403.5.3). 0 Years may lapse between the design and installation stages of a project. (g) Stop Switch in Pits. ) > word/_rels/document.xml.rels ( N0HC;qRN/W$#{1EM]ZY|vj5h),-g!`./V/KKFY4D#la&V#=$Q7|l/d#hS 7+IDZ!J 6KucD^s`+>=(3E Below is a summary of these new 2017 NEC sections: In order to comply with these requirements a chain of events must occur. Get more of Elevator World. They must be in enclosures with doors or removable panels that can be locked in the closed position. In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. Dont troubleshoot unless you can keep your shoe/boot soles dry. A traditional elevator installation (which includes a machine room) requires access inside the elevator shaft. 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. 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. One. Marking the elevator controller short-circuit current rating (SCCR) by the elevator controller manufacturer. So, we see that for elevator work, greater fill is allowed. In a time when increasing value is placed on even small amounts of real estate, elevator design must strive to configure, efficiently control and drive elements to whatever degree possible, and that is the thinking behind some alternate locations for these structures. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. The two documents are in harmony and should be used in conjunction. DOCX 26 80 00 - Elevator Electrical Requirements - University of Illinois Hammurabi, sixth king of Babylon and creator of the Babylonian Empire, decreed: If a builder builds a house for someone and does not construct it properly, and the house which he built falls in and kills its owner, then that builder shall be put to death. 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. Part VII, Overcurrent Protection, divides this topic into four categories for elevators and similar equipment, depending upon the nature of the specific equipment: For operating devices and control and signaling circuits, protection against overcurrent is in accordance with the requirements of Sections 725.43 and 725.45. Hint: Duct Tape to the Rescue, NEC: Air Conditioning and Refrigerating Equipment Part 5. (f) Illumination of Pits. 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. ), advise the building owner to correct the condition. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. Requirements for commercial garages per the National Electrical Code. You need at least one 120VAC GFCI-protected receptacle at each location. Pit drainage must be designed to eliminate a minimum capacity of 3,000 gallons per hour (or 50 GPM) per elevator car. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. Overload protection for motors is to conform with Article 430, Part III, the general code area that covers motor and branch-circuit overload protection for all motors. You may go up to 600 V for power circuits supplying door-operator controllers and door motors, branch circuits and feeders to motor controllers, driving-machine motors, machine brakes and motor-generator sets. The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. from the exposed components, and the incident energy calculated at 18 in. The surest means of avoiding an arc-flash hazard is to lockout and tagout the electrical service to a controller. 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. A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. 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.. Per the 2017 NEC, if the elevator is designated as an emergency system load, the disconnect must be protected by a surge protective device (SPD). Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. Moreover, because motors have a higher starting current than other loads, the overcurrent protection protocol is unique to them and somewhat counterintuitive. The electrical system designer calculates the maximum available fault current at the elevator controller. 354 Morgan Ave. You must locate this key switch at the main lobby or at the building fire command center. The Electrical Ups and Downs of Elevator Design | EC&M The fan should be on a dedicated circuit. Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. Limit switches placed throughout the height of the shaft communicate with the controller and stop the cab at each landing. The basic rule for conductor fill of a metal wireway, as given in Article 376, is that the sum of the cross-sectional areas of all contained conductors at a cross section of a wireway is not to exceed 20% of the interior cross-sectional area of the wireway. The same figure applies to nonmetallic wireways. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. +90 (216) 348 4876, India Office Sumps and sump pumps in pits, where provided, shall be covered. Modern electronic elevator controls can be sensitive to temperature shifts. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. NEC has a further note that the term wheelchair lift has been changed to platform lift.. Hard-service cords are permitted only as flexible connections for the top-of-car operating device or the car-top work light. 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. With these new NEC requirements, there is now the potential that an elevator controller SCCR may be required thats higher than what elevator manufacturers have historically furnished. Marking the available short-circuit (fault) current on the controller by the equipment installer. C.1.4 ELEVATOR PIT REQUIREMENTS 1. As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings.