Any other utilization equipment associated with the elevator NEC Article 620 Part V, Traveling Cables, is driven by two major issues. 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. 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. Elevator Sump Requirements - Risi Stone Inc. 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. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. z, /|f\Z?6!Y_o]A PK ! Selective coordination is also required for multiple elevators per NEC 620.62. Mobile, AL 36606 USA 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. Frequently Encountered Items That Delay Accep Tance of New Elevators Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. Finally, in 1897, the first National Electrical Code (NEC) appeared. The many codes and guidelines that regulate the electrical design of an elevator can seem overwhelming, and dealing with the electrical inspector, elevator inspector, and Fire Marshal can be even more intimidating. All rights reserved. But, building codes had been in existence for many centuries. PDF Electric Elevator Checklist Cover Page - Oregon Instruments: Use category III multimeters and be familiar with their use and limitations. These are the principle NEC 2011 Article 620 mandates. 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. We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. The panel further clarified that the marked SCCR value must be adequate for the available fault current to ensure a safe installation. As stated in Section 7 of the Elevator Industry Field Employees Safety Handbook: Unless it is not feasible, (i.e. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. In order to aid enforcement, the panel additionally required marking the available fault current at the elevator controller. !>x=yy Bvv8?~e PK ! (g) Stop Switch in Pits. If we fast forward more than 36 centuries, we see some important new developments in elevator technology. David Herres 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. Selective coordination is also required for multiple elevators per NEC 620.62. 23.254.250.15 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. Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators. Inspecting Elevator Power Wiring - IAEI Magazine +90 (216) 348 4876, India Office 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. NEC Article 0: Elevator art by David Herres Continued. Mobile, AL 36606 USA Traveling cables are to be supported by one of these means: Looping the cables around supports for unsupported lengths less than 100 ft. This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. The code notes that elevator rails or other hoistway equipment are not to be used as the grounding conductor for lightning-protection systems. You are a subscriber that needs to Sign In. 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)]. Additional branch circuits are to supply other utilization equipment not covered above. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. 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. 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. The Code provides guidance through regulations to establish requirements. 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. Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. (f) Illumination of Pits. 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. 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. Car air-conditioning and heating units 3. 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. 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. 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. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. In order to comply, the electrical system designer must determine the maximum available fault current at the elevator disconnecting means and assure the elevator disconnecting means overcurrent protective device will clear any overcurrent condition, up to the maximum available fault current, before any upstream overcurrent devices will operate. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. Thus, the traveling cable must be supported by a steel supporting member. The fan should be on a dedicated circuit. 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). All Rights Reserved | Contact Us | Privacy Policy. If the building has emergency power available, use it to supply the cab lights. The usual scenario for electrical injury is shock when electrical current passes through the human body. Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. 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. 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. Flexible cords and cables part of listed equipment operating at 30 V (42 VDC) or less, similarly supported and protected, jacketed and flame retardant, are permitted. 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. Shi Liguang, Yao Lianghong, Luo Zhiqun and Wan Jianru, Constructional Stretch and Hoist-Rope Tension . NEC 70620.85 Smoke detectors to recall elevators on Phase I recall are required to be located on each landing, First, it is now clear that elevator controllers must be marked by the manufacturer with their SCCR. 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.. 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. 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. 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 The light switch for the equipment room must be adjacent to the entrance door on the latch side. While machine room-less designs have been commercially available for many years, their use may still be unknown to some AHJs. These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. 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. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. These requirements, found in Article 620 (part of Chapter 6, Special Equipment), are in addition to NEC Chapters 1-3, which stipulate general wiring protocols applicable in most residential, commercial and industrial venues. 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. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. The light switch in the pit must be mounted 42 in. above the seal plate, adjacent to the ladder. This is somewhat broader than A17.1-2007/B44-07. For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. GET YOUR CEUS TODAY, 1998-2021. The design engineer must identify the available fault current at the elevator controller to the installer so an elevator controller with adequate SCCR can be provided. In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation. A different occurrence involves exposure to the explosive blast when there is a line-to-line or line-to-ground arc blast. 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. Such vehicles include, but are not . This room is to be secured against unauthorized access (kept locked). Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. 836 Troy Schenectady Road ; Latham, NY 12110 . 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. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. 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. 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. Part X, Emergency and Standby Power Systems, is simple and straightforward. One. 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. Pit light with guard (ten foot candles min. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. Please check your entries and try again. NEC Guidelines on Commercial Garages | EC&M [emailprotected] Another important electrical system design consideration for supplying power to multiple elevators is NEC 620.62. Part II of Article 620 concerns conductors used in elevator work, and several important requirements are covered. The disconnecting means is also to be a listed device. 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. 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. 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. 0 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. hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] 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. : inspecting; troubleshooting; observing; etc.) Luminaires must be lensed or equipped with wire guards to protect the lamps. They must be in enclosures with doors or removable panels that can be locked in the closed position. This clear working space must be 30 in. 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. Choose topics from a full list of courses covering electrical topics that cover what you need to know from the NEC and other electrical codes and standards. The Electrical Ups and Downs of Elevator Design | EC&M The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). Motor controllers are permitted outside the spaces specified above. 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. 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. 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 It states an elevator is permitted to be run by an emergency or standby power system. Such design innovations require sophisticated wiring strategies. 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). You can email the site owner to let them know you were blocked. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. 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. Sign up for our free e-newsletter. It begins by considering metal and nonmetallic wireways. Have wiring identified for use in wet locations in accordance with the requirements in NFPA 70. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. 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. 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. DOCX 26 80 00 - Elevator Electrical Requirements - University of Illinois above the pit floor, shall: Be weatherproof (NEMA 4). These selective coordination tables for current-limiting fuses show the minimum amp ratio required between a pair of fuses of a given type(s) to achieve selective coordination. 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 further stated that the disconnecting means are not to disconnect the branch circuits required in sections 620.22, 620.23 and 620.24. Thus, the need for door interlock functionality is recognized. Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. Please check your entries and try again. 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. 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. Section 620.85, GFCI Protection for Personnel, provides that 125-V, single-phase, 15- and 20-amp receptacles installed in pits, hoistways, machinery spaces, machine rooms, escalators and moving walks, and on elevator car tops are to be GFCIs. It is conditionally provided that fiber-optic cables and conductors for operating devices, operation and motion control, power, signaling, fire alarm, lighting, heating and air-conditioning circuits of 600 V or less are permitted to be run in the same traveling cable or raceway system. The traveling cable or raceway is also permitted to include shielded conductors and/or one or more coaxial cables. 2. (B) Lighting Switch. 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. ASME A17.1, Section 2.2.5, National Electrical Code, Rule 620-85 4. 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. 2.2.2.6 . 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. 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. Eazylift Albany LLC, 836 Troy Schenectady Rd, Latham, NY, Elevators 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. Described below are several work practices that may be used to reduce arc-flash hazards when working on energized equipment: 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 fact, an entire elevator system for a project is most often designed and specified by the architect who has little understanding of the electrical distribution system. The idea is quite simple. Additionally, duty on elevator and dumbwaiter motors is rated as intermittent, whereas duty on escalator and moving-walk motors is considered continuous. Modern electronic elevator controls can be sensitive to temperature shifts. All Rights Reserved | Contact Us | Privacy Policy. The electrical system designer calculates the maximum available fault current at the elevator 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.
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