Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. 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 836 Troy Schenectady Road Latham, NY 12110 . 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. Indeed, most elevator accidents involve maintenance workers, yet even theirs is not an excessively dangerous profession. 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. 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. Limit switches placed throughout the height of the shaft communicate with the controller and stop the cab at each landing. These are the principle NEC 2011 Article 620 mandates. 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. 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. For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. 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. Luminaires must be lensed or equipped with wire guards to protect the lamps. Hard-service cords and junior hard-service cords are permitted as flexible connections between the fixed wiring on the car and devices on the car doors or gates. 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. 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 Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. You need at least one 120VAC GFCI-protected receptacle at each location. Get directions, reviews and information for Eazylift Albany LLC in Latham, NY. Design practices that are acceptable in some jurisdictions may not be in others. Part X, Emergency and Standby Power Systems, is simple and straightforward. Lights and convenience outlets in elevator pits shall be installed to comply with the requirements of CCR, Title 24, Part 3, Article 620. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. Dont troubleshoot unless you can keep your shoe/boot soles dry. To achieve flexibility and endurance, traveling cable is more finely stranded and, where possible, separated into discrete conductors. 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. 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). Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. 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. In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation. The electrical conductors and equipment for non-mine elevators that extend below grade are under NEC jurisdiction. 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. One. Additional branch circuits are to supply other utilization equipment not covered above. 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 fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. Every building is different. The same figure applies to nonmetallic wireways. 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. Depending on your local codes, you can do this by installing heat or smoke detectors within 24 in. hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] z!0: - [Content_Types].xml ( n0EUb*>-RxV=QUAl"93dFk%Y?l}MGDV Years may lapse between the design and installation stages of a project. Shi Liguang, Yao Lianghong, Luo Zhiqun and Wan Jianru, Constructional Stretch and Hoist-Rope Tension . [emailprotected] [emailprotected] Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. 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. 6 feet, and shall meet the requirements of NEC 70 620.21(A)(1)(d). The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. 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. Cross-sectional areas of wireways are found by multiplying the two interior dimensions.) C.1.4 ELEVATOR PIT REQUIREMENTS 1. Always verify all conditions and requirements with the state and the AHJ where the installation is taking place. Selective coordination is also required for multiple elevators per NEC 620.62. 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. 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. Corporate Office (B) Lighting Switch. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. 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. Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. The lighting switch shall be located so as to be readily accessible from the pit access door. It is worth noting that these NEC terms, used throughout Article 620, have been chosen to correlate with A17.1-2007 usage. While machine room-less designs have been commercially available for many years, their use may still be unknown to some AHJs. In driving through commercialized suburban areas, you frequently see paralleled conductors for large retail grocers (where there is a heavy refrigeration load). A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. 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. Below is a summary of these new 2017 NEC sections: In order to comply with these requirements a chain of events must occur. Many undertake trips in these devices two or more times daily in full confidence that they will survive an uneventful experience with a minute chance of disaster or even inconvenience. 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. Through numerous editions, the NEC has, to a great extent, mitigated the hazards accompanying widespread use of electricity, particularly with respect to elevator technology. This is because the material may contribute fuel to a fire that has originated elsewhere. NEC Article 620 covers elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts. Corporate Office Requirements in Article 620 modify the articles in Chapter 3. 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. Metallic articles: Remove metallic articles such as watches, chains, bracelets, earrings, belt buckles and keychains before troubleshooting. +91 8025357028, 2022 Elevator World, LLC. 2023 Endeavor Business Media, LLC. If you can illuminate the pit using lights that are "above the top of the pit" (whatever that . 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. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. In case of emergency, electricians, maintenance personnel and any elevator technicians called in to the premises should have ready access to the key. The two primary hazards are fire and electric shock or arc flash, although there are others. All Rights Reserved | Contact Us | Privacy Policy. 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. The light switch in the pit must be mounted 42 in. This room is to be secured against unauthorized access (kept locked). 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. As stated in Section 7 of the Elevator Industry Field Employees Safety Handbook: Unless it is not feasible, (i.e. (To design and install an elevator for a Class I, Division 1 location would be quite an undertaking.). In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. above the seal plate, adjacent to the ladder. 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. The code notes that elevator rails or other hoistway equipment are not to be used as the grounding conductor for lightning-protection systems. Car air-conditioning and heating units 3. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. 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. The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. Sign up for our free e-newsletter. You need to Subscribe to continuing reading. Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. However, when I've put in elevators, NEC seems to always take a back seat to ANSI, which seems . q!^mDtsnEX3_ shvqu+X9@w3gSj`g He is saying that each pit requires a separate circuit, in other words "dedicated". 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. Pits shall be maintained in a clean and dry condition. 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. Pit light with guard (ten foot candles min. You are a subscriber that needs to Sign In. NEC specifies Hoistway wiring, and doesn't seem to distinguish between hoistway and pit. NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) 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. Cross-sectional areas of conduits are given in Chapter 9, Table 4. 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. The action you just performed triggered the security solution. However, it is likely that for many elevator controllers, this may not be high enough for the available fault current where they will eventually be installed. For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. Marking the available short-circuit (fault) current on the controller by the equipment installer. 2.2.2.6 . Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). 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? Such design innovations require sophisticated wiring strategies. Have wiring identified for use in wet locations in accordance with the requirements in NFPA 70. However, space is frequently limited within the shaft and as such many ancillary components (shunt trip circuit breakers, fused disconnects) may need to be located outside of the elevator shaft. CLAIMED . 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. 4.0 (2 Reviews) (2) CLAIMED . A different occurrence involves exposure to the explosive blast when there is a line-to-line or line-to-ground arc blast. Many professionals believe the NEC is applicable only for voltages over a certain level, but that is not the case. As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. [emailprotected] +1-251-479-4514 | [emailprotected], Trkiye Office We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. Your IP: Mobile, AL 36606 USA The disconnecting means is to be located adjacent to or an integral part of the motor controller. ASME A17.1 . In Part One of this series (ELEVATOR WORLD, April 2012), we began an examination of National Electrical Code (NEC) 2011 mandates for elevators and related equipment installations. First, the traveling cable must be composed of very fine-stranded conductors so it can flex with a minimum of internal stresses, ensuring long service life and reliability. The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. All rights reserved. For example, it is stated that the cross-sectional area of the individual conductors in a wireway are not to exceed 50% of the interior cross-sectional area of the wireway. A raceway that comes loose on the inside of a hoistway could catch on a moving car, causing immense damage and hazard to users. Thus, the need for door interlock functionality is recognized. The AHJ is saying that this is a violation of 620.23. Each fused switch or circuit breaker in the panelboard is used as an elevator disconnect. 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. charlie b. 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. You must run a separate insulated grounding conductor with the feeder conductors from the electrical source to the elevator controller. 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. Even non-composite fiber-optic cable, which does not carry electrical energy, is subject to the code. 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. 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. Where necessary, it is mandated that suitable guards be provided to protect the cables against damage. 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. 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. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. You can email the site owner to let them know you were blocked. My reasoning comes from 620.24 (A) and (C). As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. 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. No provision is to be made to automatically restore power. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. 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. NFPA 72 requires the control circuit between the Fire Alarm System and the shunt trip be monitored for integrity. NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. Get more of Elevator World. 988 0 obj <>stream Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. 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. 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. 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. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Many new buildings are incorporating an elevator design that does not include an equipment room (sometimes called machine room-less elevators). endstream endobj 954 0 obj <. Metal grating shall be installed over the hole that sits flush with the pit floor. First, it is now clear that elevator controllers must be marked by the manufacturer with their SCCR. A further requirement concerns elevator-car air-conditioning and heating. 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. The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. Performance & security by Cloudflare. It does specify wiring methods allowed, though, in 620. 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. For circuit breakers, time-current curves must be consulted as well as the circuit breaker manufacturers selective coordination tables. 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. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. You need to Subscribe to continuing reading. 2m9 `K]f*F gaR Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. All Rights Reserved | Contact Us | Privacy Policy. Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. Nevertheless, the primary NEC focus is on elevators, and the intention is to mitigate the hazards associated with the use of electricity. 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. For platform lifts and stairway chairlifts, the duty is intermittent. Car lighting, receptacles and ventilation 2. 3. 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. 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. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. 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. It states an elevator is permitted to be run by an emergency or standby power system. above the pit floor, shall: Be weatherproof (NEMA 4). Fuses: Verify that the correct size, type and capacity are installed. NEC 70620.85 Smoke detectors to recall elevators on Phase I recall are required to be located on each landing, He also required GFCI protection for the hard-wired sump pump that did not require it. It provides that where more than one driving-machine disconnecting means is supplied by a single feeder, the overcurrent protective devices in each disconnecting means are to be selectively coordinated with any other supply side overcurrent protective devices. Sumps and sump pumps in pits, where provided, shall be covered. Related Code Sections 802.1.8 Indirect/Special Waste, Elevator Pit Drain or Sump Pump Elevator Pit Sump Pump Electrical Requirements By Nat July 30, 2022 Bulls Eye (Simplex) Receptacles: Bulls eye (simplex) receptacle for Sump pumps (now not - GFI) on a delegated circuit will be required in all elevator pits for the elevator pit sump pump. 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. The basic idea is that there must be a separate, dedicated circuit for car lights, receptacles and ventilation on each car. This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. However, this can vary depending on building conditions and exterior grade. Because they need to move and flex, traveling cables are not required to be in a raceway. 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). 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)]. Flexible cords and cables (same conditions as within hoistways). . from components that are not otherwise guarded. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. 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. Each of these performs a different function, and the wiring mandates vary accordingly. Additionally, duty on elevator and dumbwaiter motors is rated as intermittent, whereas duty on escalator and moving-walk motors is considered continuous. The demand factors are given in Table 620.14, which allows significant reductions as the number of motors is increased. 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. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. 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. (g) Stop Switch in Pits. An exception provides that liquid-tight flexible metal conduit or liquid-tight flexible nonmetallic conduit 3/8 in. 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..