First, you'll need to install lighting in the elevator equipment room (Photo 1) and shaft pit (Photo 2). !>x=yy Bvv8?~e PK ! The same figure applies to nonmetallic wireways. 953 0 obj <> endobj The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. Hoistway pit lighting and receptacles 5. The two main types of elevators are hydraulic and traction. NFPA 72 requires the control circuit between the Fire Alarm System and the shunt trip be monitored for integrity. The traveling cable or raceway is also permitted to include shielded conductors and/or one or more coaxial cables. f?3-]T2j),l0/%b 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 simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. Sign up for our free e-newsletter. 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. Jul 15, 2021. Pit light with guard (ten foot candles min. (f) Illumination of Pits. 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. These may include: The author would like to recognize Jonathan Kennedy for his assistance in creating this article. A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. 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. Though I understand how someone might argue two. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. 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. And so the needs can be very different. This may be countered by providing good machine-room ventilation. 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. 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). Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. Mainline disconnect: DO NOT OPEN THE MAINLINE DISCONNECT SWITCH COVER unless employees are authorized, properly trained and appropriate measures are taken commensurate with the higher risk of arc-flash hazards. Each fused switch or circuit breaker in the panelboard is used as an elevator disconnect. [emailprotected] The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. Convenience receptacles and lighting for maintenance purposes are required at the base of the pit and, in some instances (elevator manufacturer dependent), at the top of the elevator shaft. High-rise buildings pose additional concerns. For instance, a typical elevator controller may traditionally have SCCR ratings from 5 to 10 kA. The sump pump/drain shall have the capacity to remove a minimum of 11.4 m. 3 /h (3,000 gal/h) per elevator. Building codes were deemed necessary to protect the public against shoddy builders and outmoded construction techniques. h-`7 Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. 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. Additional branch circuits are to supply other utilization equipment not covered above. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. Three wiring categories within hoistways are allowed in addition, each with exceptions. The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. GFI Receptacles: GFI receptacles shall be required in all elevator machine rooms, machinery spaces and elevator pit areas. %%EOF Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. NEC 70620.85 Smoke detectors to recall elevators on Phase I recall are required to be located on each landing, ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. Fuses: Verify that the correct size, type and capacity are installed. 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. Traveling cables are to be approved for hazardous locations and must comply with the appropriate sections for each hazardous-location class that covers use of flexible cords. 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 Conductors supplying a single motor are to have an ampacity not less than the percentage of motor nameplate current determined from Section 430.22(A) and (E). A further requirement concerns elevator-car air-conditioning and heating. Traveling cables are to be supported by one of these means: Looping the cables around supports for unsupported lengths less than 100 ft. The two primary hazards are fire and electric shock or arc flash, although there are others. (B) Lighting Switch. This is because the material may contribute fuel to a fire that has originated elsewhere. Elevator travel is far safer than an automobile trip, and the chance of experiencing disaster is on the order of being struck by lightning in ones own backyard. The traveling cable, of necessity, is exempted. +1-251-479-4514 | [emailprotected], Trkiye Office 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. In some cases, it may require a means to test the shunt trip operation or have one contact operate the shunt trip of more than one elevator. This may be countered by providing good machine-room ventilation. While the definitions are straightforward, their deployment in real-life building projects involves enormous legal and moral implications, given the fact that we are carrying large numbers of people hundreds of feet above the earths surface on a daily basis. It is important for design engineers to communicate this with the architect and owner during the design phase, as it will impact space needs elsewhere in the facility to accommodate electrical equipment. (To design and install an elevator for a Class I, Division 1 location would be quite an undertaking.). Requirements for commercial garages per the National Electrical Code. 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. 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. 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. Get more of Elevator World. Additionally, duty on elevator and dumbwaiter motors is rated as intermittent, whereas duty on escalator and moving-walk motors is considered continuous. 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. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. 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. But by understanding how these items fit together and what purpose they serve, you can have a successful project. We generally think of the 19th century as the great age of building codes. 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. Flexible cords and cables, or conductors grouped together and taped or corded, are permitted to be installed without a raceway. Please check your entries and try again. Any other utilization equipment associated with the elevator Good documentation is of key importance to recalling what decisions were made and why. First, it is now clear that elevator controllers must be marked by the manufacturer with their SCCR. Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators. 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. Where voltages exceed 600, a sign reading DANGER HIGH VOLTAGE is required. The electrical system designer calculates the maximum available fault current at the elevator controller. hbbd```b``+3dL `Y[gw9`RLJO*A$w$@L`F*{|0 P 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. Here again, the lighting is not to be connected to a GFCI, whereas such protection is required for the receptacle(s). Have wiring identified for use in wet locations in accordance with the requirements in NFPA 70. In these installations, it is best to design the elevator controller so the elevator controller SCCR is adequate for the available fault current. 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. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. Finally, typical installations and compliance with all these requirements will be discussed. 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. If you specify a rescuvator, you must also specify a disconnect switch with an auxiliary contact that opens when the disconnect arm moves to the open position, but stays closed when the OCPD trips. 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. After such an event, it is important that the affected worker is able to escape the area and get to help. 3. 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. Here are 23 ways that both chapters and the national office can meet todays major challenge of making members feel valued, IAEIs Online Training allows you to learn at your own pace or live with an expert instructor, from the comfort of your laptop or PC. Hoistway door interlock wiring from the riser must be flame retardant and have insulation suitable for a temperature not less than 200C (392F), much higher than that required for most raceway or cable applications. Acceptable types of wire for this application are given in Table 400.4, which occurs in an earlier chapter and lists various types of elevator cable for lighting and control in both unclassified and hazardous locations. GET YOUR CEUS TODAY, 1998-2021. Flexible cords and cables in lengths not to exceed 6 ft. of a flame-retardant type and located to be protected from physical damage are permitted in machine rooms without being installed in a raceway. Sumps and sump pumps in pits, where provided, shall be covered. As always, the best advice in all instancesdo your homework, communicate often, and document decisions made. PK ! C.1.4 ELEVATOR PIT REQUIREMENTS 1. The most complex of these is the elevator. 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? 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 Americans with Disabilities Act Accessibility Guidelines for Buildings and Facilities (ADAAG) now require the cab to have a special phone accessible by individuals with disabilities. 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. The conduit alone can't act as the grounding means. ASME A17.1, Section 2.2.5, National Electrical Code, Rule 620-85 4. Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. NEC Guidelines on Commercial Garages. . Electricity is often one of the initial services to fail during a storm. [emailprotected] 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. 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. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. 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. Click to reveal Firefighters can then use portable telephone handsets in combination with the jacks and cabling. 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). Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. In hoistways not longer than 6 ft., these additional wiring methods are permitted: A sump or oil-recovery pump located in the pit is permitted to be cord connected. When you're designing an electrical system for a building, don't let elevator requirements bring you down. 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. NEC has a further note that the term wheelchair lift has been changed to platform lift.. 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. We have circuited the receptacles and lights in the pits to the same circuit. You need to Subscribe to continuing reading. Pit drainage must be designed to eliminate a minimum capacity of 3,000 gallons per hour (or 50 GPM) per elevator car. Section 725.45 concerns the location of overcurrent devices and provides for feeder and branch-circuit taps, transformer primary side overcurrent device location and overcurrent device location at the input side of electronic power sources. 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. Car lighting, receptacles and ventilation 2. You are seeing this message for one of three reasons: You have reached your limit of free content. endstream endobj startxref Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. The idea is quite simple. Depending on your local codes, you can do this by installing heat or smoke detectors within 24 in. The fan should be on a dedicated circuit. 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. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Similarly, underground wiring in mines is not NEC regulated, although other, non-mine wiring below ground (such as lighting in an underground traffic tunnel) is covered. 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. Based on the analysis, the arc-flash boundaries at the elevator/escalator controllers ranged from 3-16 in. 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. Sign up for our free e-newsletter. Thus, the traveling cable must be supported by a steel supporting member. This, however, can result in a dramatic increase in cost, space availability (lack thereof), and reduced efficiency. Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. The various items to consider and check when designing for elevator installations have many potential pitfalls. The code notes that elevator rails or other hoistway equipment are not to be used as the grounding conductor for lightning-protection systems. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc Nevertheless, the primary NEC focus is on elevators, and the intention is to mitigate the hazards associated with the use of electricity. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. employees shall not perform any work on equipment where there is a potential to come in contact with energized mechanical or electrical hazards until all sources of energy have been de-energized, grounded or guarded.. Traditional wiring methods and materials come into play, as always, but it is necessary to rethink their deployment. 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. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. 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. Many NEC articles address voltage limitations, and Article 620 is no exception. ), 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. 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. In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation. hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] You can email the site owner to let them know you were blocked. Even non-composite fiber-optic cable, which does not carry electrical energy, is subject to the code. In case of emergency, electricians, maintenance personnel and any elevator technicians called in to the premises should have ready access to the key. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ Corporate Office Notice the definition mentions the full range of operating times. 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). Supports for cables or raceways in a hoistway or in an escalator or moving-walk wellway or platform lift and stairway chairlift runway must be securely fastened to the guide rail, escalator or moving-walk truss, or to the hoistway, wellway or runway construction. Elevator motors are inherently intermittent duty. Weight (passengers, freight, car and attendant machinery) may be fairly substantial, and speed is significant. Marking the available short-circuit (fault) current on the controller by the equipment installer. Years may lapse between the design and installation stages of a project. 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. Your elevator supplier will take care of all the wiring and related code requirements for the elevator cab and the various controls. For elevators that regenerate power back into a power source unable to absorb the regenerative power under overhauling elevator load conditions, a means to absorb this power is to be provided. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. Metal grating shall be installed over the hole that sits flush with the pit floor. (C) Duplex Receptacle. Finally, in 1897, the first National Electrical Code (NEC) appeared. Cloudflare Ray ID: 7a2fbe9ebd7e2fe8 NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. 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. Article 620s Definitions section includes two terms that describe spaces not attached to the outside of a hoistway. Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. 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. The AHJ is saying that this is a violation of 620.23. If it kills the son of the owner, the son of that builder shall be put to death.. Similarly, the integrity of the traveling cable is emphasized. It begins by considering metal and nonmetallic wireways. It is noted that the article covers the installation of electrical equipment and wiring for elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts. In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. NEC specifies Hoistway wiring, and doesn't seem to distinguish between hoistway and pit. 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. Part II of Article 620 concerns conductors used in elevator work, and several important requirements are covered. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. Get directions, reviews and information for Eazylift Albany LLC in Latham, NY. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. +90 (216) 348 4876, India Office +1-251-479-4514 | [emailprotected], Trkiye Office Motor controllers are permitted outside the spaces specified above. Pits shall be maintained in a clean and dry condition. Machine room-less elevator installations incorporate the elevator controller and often the primary disconnecting means in a convenient package that is located within the elevator shaft. They are to be part of listed equipment, a driving machine or a driving-machine brake. The panel further clarified that the marked SCCR value must be adequate for the available fault current to ensure a safe installation. The next section, 620.36, concerns different systems in one raceway or traveling cable. In elevators provided with Firefighters' Emergency Operation, a drain or sump pump shall be provided. Adhering to the requirements will ensure a hazard-free electrical installation. (A) Separate Branch Circuit. from the exposed components, and the incident energy calculated at 18 in. As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. ) > 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 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. Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. 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..