nec elevator pit requirements

2.2.6.1 This switch shall be so located as to be acces-sible from the pit access door. The demand factors are given in Table 620.14, which allows significant reductions as the number of motors is increased. 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. If it kills the son of the owner, the son of that builder shall be put to death.. 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. NEC Article 0: Elevator art by David Herres Continued. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. Please check your entries and try again. If we fast forward more than 36 centuries, we see some important new developments in elevator technology. The elevator rails, like the ground system of the entire building electrical structure, are to be bonded to the lightning-system ground electrode so these all remain at the same potential even during a lightning event, ensuring side flash does not occur. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. 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. You must run a separate insulated grounding conductor with the feeder conductors from the electrical source to the elevator controller. 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. This device must be either a fused disconnect or a circuit breaker because ANSI/ASME A17.1 requires you to install an additional overcurrent protection device (OCPD) in the elevator equipment room. Though I understand how someone might argue two. 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. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc A little more narrowly focused (yet of great consequence) is the ubiquitous NEC, which, in the National Fire Protection Association (NFPA)s venerable Handbook edition, devotes 18 double-column pages to electrical design and installation requirements for elevators, escalators and related equipment. Mobile, AL 36606 USA Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. Pit drainage must be designed to eliminate a minimum capacity of 3,000 gallons per hour (or 50 GPM) per elevator car. The basic requirement is for minimum clear distances of various depths for equipment operating at 600 V or less, nominal, depending upon voltage to ground and lateral distance to insulated or grounded surfaces or exposed live parts (not an issue in elevator machine rooms). Part VIII, Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces, states elevator and similar-installation driving machines, motor-generator sets, motor controllers and disconnecting means are to be installed in a room or space set aside for that purpose. ASME A17.1 . hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] Mobile, AL 36606 USA The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. 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. A raceway that comes loose on the inside of a hoistway could catch on a moving car, causing immense damage and hazard to users. Hydraulic elevators are typically more cost effective and used for buildings up to 5-6 stories. Three wiring categories within hoistways are allowed in addition, each with exceptions. As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. The conduit alone can't act as the grounding means. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. Each of these performs a different function, and the wiring mandates vary accordingly. Elevator cab lights require emergency back-up power. 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. (A) tells us that the lighting and receptacle (s) for the pit must be on separate circuits. 23.254.250.15 We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. You need to Subscribe to continuing reading. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. First, you'll need to install lighting in the elevator equipment room (Photo 1) and shaft pit (Photo 2). In case of emergency, electricians, maintenance personnel and any elevator technicians called in to the premises should have ready access to the key. Such design innovations require sophisticated wiring strategies. A clean and dry elevator pit and machine/control room provided (ASME A17.1 Rule 2.1.2) Machine/control room meets manufacturer's requirement of preserving ambient temperature control and humidity (ASME A17.1 Rule 2.7.9) Elevator floor covering installed with appropriate smoke and flame spread (ASME A17.1 Rule 2.14.2) These 29 CFR 1910.146 (c) (8) requirements are: (f) Illumination of Pits. 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. On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. Part X, Emergency and Standby Power Systems, is simple and straightforward. NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) f?3-]T2j),l0/%b The light switch shall be located so to be accessible from pit access door. endstream endobj startxref No provision is to be made to automatically restore power. !>x=yy Bvv8?~e PK ! 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. 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. This is typically accomplished via a shunt trip device. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. 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. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. The traveling cable, of necessity, is exempted. This is because the material may contribute fuel to a fire that has originated elsewhere. You are seeing this message for one of three reasons: You have reached your limit of free content. NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. 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. The basic wiring methods are rigid-metal, rigid nonmetallic or intermediate-metal conduit; electrical metallic or rigid nonmetallic tubing; wireways; or Type MC, MI or AC cable, unless otherwise permitted. One. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. When you consider that an elevator is an enclosed room with one or more doors that people voluntarily enter so they may travel hundreds of feet up or down, several observations are in order. Personal protective equipment (PPE): Use appropriate PPE to protect body parts within the range of 3-16 in. 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. Such vehicles include, but are not . 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. Fluid pressure in the cylinder raises and lowers the elevator cab. It begins by considering metal and nonmetallic wireways. You are a subscriber that needs to Sign In. 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. These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. All elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. 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. Through numerous editions, the NEC has, to a great extent, mitigated the hazards accompanying widespread use of electricity, particularly with respect to elevator technology. 2. Elevator motors are inherently intermittent duty. The traveling cable or raceway is also permitted to include shielded conductors and/or one or more coaxial cables. For instance, a typical elevator controller may traditionally have SCCR ratings from 5 to 10 kA. This accomplishes two functions. Furthermore, at least one 125-V, single-phase, 15- or 20-amp duplex receptacle is to be provided in each machine room or similar location. Hoistway pit lighting and receptacles 5. [emailprotected] Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. 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. 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. If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. It is worth noting that these NEC terms, used throughout Article 620, have been chosen to correlate with A17.1-2007 usage. Upon loss of power, the rescuvator controls the cab, lowers it to the designated floor, and opens its doors. Sign up for our free e-newsletter. The light switch in the pit must be mounted 42 in. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. GET YOUR CEUS TODAY, 1998-2021. [emailprotected] All Rights Reserved | Contact Us | Privacy Policy. proved for elevator locations - car, hoistway, pit and a-chine roo equireents in Article odify the articles in Chap - ter For eaple, it is stated that the cross-sectional area An example would be the elevator, as well as all wiring in a utility-owned administration building. Cloudflare Ray ID: 7a2fbe9ebd7e2fe8 The cover shall be secured and level with the pit floor. They must be in enclosures with doors or removable panels that can be locked in the closed position. 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. Something went wrong. This, however, can result in a dramatic increase in cost, space availability (lack thereof), and reduced efficiency. Modern electronic elevator controls can be sensitive to temperature shifts. In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. These conductors may be covered with suitable shielding for telephone, audio, video or higher-frequency communications circuits. Where voltages exceed 600, a sign reading DANGER HIGH VOLTAGE is required. Building codes were deemed necessary to protect the public against shoddy builders and outmoded construction techniques. The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. 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. A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. tC|[S9G?+uJP>&/TOy o PK ! Sign up for our free e-newsletter. This is especially true in an elevator shaft where measures have to be taken to ensure that a hazardous situation is not created. 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). 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. 953 0 obj <> endobj This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. There are options available to achieve this depending upon the customers needs. Finally, typical installations and compliance with all these requirements will be discussed. 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). By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. 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. 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. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. 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. If your specifications require a vent at the top of the shaft for venting smoke, you must provide a key switch with a pilot light to control that vent. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. Cylinders in hydraulic elevators usually aren't suitable for buildings taller than five stories. of the sprinkler heads. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. 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. 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. If the building has emergency power available, use it to supply the cab lights. 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. 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. IAEI News Magazine. 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). You need to Subscribe to continuing reading. Freight Elevator Door Control: An Opportunity for Wireless Technology. It is further stressed that no provision is to be made to open or close the disconnecting means from any other part of the premises. 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. 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. The two main types of elevators are hydraulic and traction. The electrical system designer calculates the maximum available fault current at the elevator controller. 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. 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. 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. Special conditions: Troubleshooting in wet, hot or cold conditions calls for extra caution. 2m9 `K]f*F gaR The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. Many NEC articles address voltage limitations, and Article 620 is no exception. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. Proper selective coordination in a multi-elevator installation on the same feeder ensures if one elevator develops a fault, the other units will not be shut down. Dan Neeser is a Senior Field Application Engineer with Eatons Bussmann Division. The disconnecting means is to be located adjacent to or an integral part of the motor controller. A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. The same figure applies to nonmetallic wireways. Each fused switch or circuit breaker in the panelboard is used as an elevator disconnect. Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. 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? Hydraulic elevators comprise a hydraulic reservoir, pump, cylinder, and controller. 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. Guarding: Where possible, install temporary guarding to protect from inadvertent contact. Marking the available short-circuit (fault) current on the controller by the equipment installer.

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