Adhering to the requirements will ensure a hazard-free electrical installation. 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). First, it is now clear that elevator controllers must be marked by the manufacturer with their SCCR. This switch will ensure that the elevator won't descend into the elevator pit and allow maintenance people to work safely in the area beneath the cab. Loss of voltage to the control circuit for the disconnecting means shall cause a supervisory signal to be indicated at the control unit and required remote annunciation. [emailprotected] Compliance with the 2017 NEC for Elevator Controllers A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. 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. NEC 70620.85 Smoke detectors to recall elevators on Phase I recall are required to be located on each landing, z!0: - [Content_Types].xml ( n0EUb*>-RxV=QUAl"93dFk%Y?l}MGDV In a time when increasing value is placed on even small amounts of real estate, elevator design must strive to configure, efficiently control and drive elements to whatever degree possible, and that is the thinking behind some alternate locations for these structures. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. (All intentionally grounded elements must be held at equal potential.) My reasoning comes from 620.24 (A) and (C). Moreover, it is necessary to consider future worker safety for an indefinite period. 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 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. from components that are not otherwise guarded. 836 Troy Schenectady Road Latham, NY 12110 . Fuses: Verify that the correct size, type and capacity are installed. 953 0 obj <> endobj 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 branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. It is further specified the machine-room lighting switch be located at the point of entry. 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. 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. . ), advise the building owner to correct the condition. For example, an inadequately supported ceiling fan could fall and cause injury or property damage. Jul 15, 2021. 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. 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. This lighting and receptacle circuit is separate from the circuit serving the motor. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. After reading this article, you should have learned about: The meanings of definitions for control room and control space versus machine room The purpose and specifications for working spaces Insulation types and minimum sizes of conductors Requirements for feeder and branch-circuit conductors Feeder demand factors for ele-vators. 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. Please check your entries and try again. These may include: The author would like to recognize Jonathan Kennedy for his assistance in creating this article. PDF Electric Elevator Checklist Cover Page - Oregon Fluid pressure in the cylinder raises and lowers the elevator cab. This website is using a security service to protect itself from online attacks. This clear working space must be 30 in. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. 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. 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. The basic idea is that there must be a separate, dedicated circuit for car lights, receptacles and ventilation on each car. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. 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). It is of great importance for the design engineer to communicate with their local authority having jurisdiction (AHJ) to determine fire alarm requirements for the respective elevator installation. 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. As they review the plans and the construction site, they may have conflicting interpretations or requirements. Therefore, elevator equipment rooms must maintain a temperature between 50F and 90F. You need to Subscribe to continuing reading. One. Elevator Pit Drain or Sump Pump | UpCodes Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. 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. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. hbbd```b``+3dL `Y[gw9`RLJO*A$w$@L`F*{|0 P 2m9 `K]f*F gaR of the sprinkler heads. Hydraulic elevators are typically more cost effective and used for buildings up to 5-6 stories. 3. NEC Guidelines on Commercial Garages | EC&M 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. Limit switches placed throughout the height of the shaft communicate with the controller and stop the cab at each landing. Elevator Sump Requirements - Risi Stone Inc. Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. from the exposed components, and the incident energy calculated at 18 in. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. 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. Where voltages exceed 600, a sign reading DANGER HIGH VOLTAGE is required. NEC has a further note that the term wheelchair lift has been changed to platform lift.. (g) Stop Switch in Pits. Good documentation is of key importance to recalling what decisions were made and why. 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. [emailprotected] Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. 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. 354 Morgan Ave. Metal grating shall be installed over the hole that sits flush with the pit floor. Dont troubleshoot unless you can keep your shoe/boot soles dry. The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. This, however, can result in a dramatic increase in cost, space availability (lack thereof), and reduced efficiency. Notice the definition mentions the full range of operating times. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. NEC Article 620 covers elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. 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. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. They must be in enclosures with doors or removable panels that can be locked in the closed position. Traveling cables are to be supported by one of these means: Looping the cables around supports for unsupported lengths less than 100 ft. The most complex of these is the elevator. When you're designing an electrical system for a building, don't let elevator requirements bring you down. Part IX, Grounding, states that metal raceways, Type MC cable, Type MI cable or Type AC cable attached to elevator cars are to be bonded to metal parts of the car bonded to the equipment grounding conductor. But, building codes had been in existence for many centuries. Regardless of the number of elevators, only one smoke detector is required at each floor lobby, but it must be located within 21 ft of every elevator door. 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. The traveling cable, of necessity, is exempted. NEC Article 620: Elevators, Part 2 - Elevator World, Inc. It is worth mentioning that when 600 V is talked about as a limit in the NEC, it is generally meant that the familiar 600-V nominal-voltage system is considered to lie within the permitted zone, making it a common usage. U.S. Latham, NY Shopping Miscellaneous Retail Stores, NEC Wheelchair lifts EazyLift Elevators, . Because of this, several manufacturers offer an all-in-one shunt trip elevator disconnect switch that includes all the prewired accessories needed to comply with the various Code sections. Building codes were deemed necessary to protect the public against shoddy builders and outmoded construction techniques. 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. 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 Additional requirements concern escape routes. Part X, Emergency and Standby Power Systems, is simple and straightforward. 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. The conduit alone can't act as the grounding means. As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. Have wiring identified for use in wet locations in accordance with the requirements in NFPA 70. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. 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. 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. Additionally, duty on elevator and dumbwaiter motors is rated as intermittent, whereas duty on escalator and moving-walk motors is considered continuous. 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. Flexible cords and cables (same conditions as within hoistways). 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. If we fast forward more than 36 centuries, we see some important new developments in elevator technology. Utility-owned electrical structures not directly concerned with electrical generation, transmission and distribution are NEC regulated. A different occurrence involves exposure to the explosive blast when there is a line-to-line or line-to-ground arc blast. You need at least one 120VAC GFCI-protected receptacle at each location. 3. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. See Section 3 of the. hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] Recommendations for EazyLift Elevators, Stairlifts, Wheelchair Lifts On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. In this case, it may be best if the elevator controller manufacturer does not include the elevator disconnecting means (often offered as a circuit breaker) but instead have the installer provide a separate fused disconnect to comply with NEC 620.51(A) and also achieve a high SCCR for the elevator controller when fuses are provided as specified by the elevator controller and marked on the elevator controller nameplate. 2.2.6.1 This switch shall be so located as to be acces-sible from the pit access door. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. The feeder OCPD needs to remain closed so the remaining elevators have power and continue to function. We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. Finally, typical installations and compliance with all these requirements will be discussed. A raceway that comes loose on the inside of a hoistway could catch on a moving car, causing immense damage and hazard to users. Indeed, most elevator accidents involve maintenance workers, yet even theirs is not an excessively dangerous profession. EazyLift Elevators, Stairlifts, Wheelchair Lifts & Ramps. Cross-sectional areas of conduits are given in Chapter 9, Table 4. You must locate this key switch at the main lobby or at the building fire command center. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ 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. Car air-conditioning and heating units 3. This is because the material may contribute fuel to a fire that has originated elsewhere. 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. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. wide or the width of the equipment, whichever is greater. But the lights don't have to be in the pit itself. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. (e) Pit Maintenance. (ASME has a separate document, A18.1-2008 Safety Standard for Platform Lifts and Stairway Lifts). In these installations, it is best to design the elevator controller so the elevator controller SCCR is adequate for the available fault current. Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing. 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. Similarly, the integrity of the traveling cable is emphasized. (Hard-service and junior hard-service are trade names that apply to over 30 types of flexible cord, all beginning with the letter S. They have varying properties, such as oil resistance, and various material compositions for insulation, such as a thermoplastic elastomer. 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. Selective coordination is also required for multiple elevators per NEC 620.62. All rights reserved. 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. Hint: Duct Tape to the Rescue, NEC: Air Conditioning and Refrigerating Equipment Part 5. or larger is permitted to be installed in lengths in excess of 6 ft. Where motor-generators, machine motors or pumping-unit motors and valves are located adjacent to or underneath control equipment and provided with extra-length terminal leads not exceeding 6 ft. in length, such leads are permitted to be extended to connect directly to controller terminal studs without regard to carrying-capacity requirements. Years may lapse between the design and installation stages of a project. 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). 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. A separate 120VAC, 15A circuit is required for cab lighting and accessories, and it must have its own local disconnect and OCPD in the equipment room as well. David Herres Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. (A) Separate Branch Circuit. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc Elevator Pit Requirements | Mike Holt's Forum 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. 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. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. This is typically accomplished via a shunt trip device. The AHJ is saying that this is a violation of 620.23. Frequently Encountered Items That Delay Accep Tance of New Elevators 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. This is something that can be easily accomplished if the elevator controller manufacturer uses components in combination with overcurrent protective devices that are tested and listed with high combination SCCRs. Many people use portable generators until power is restored. 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.. This will normally require you to vent the room with a fire/smoke damper and include smoke detector signals in the control logic. For circuit breakers, time-current curves must be consulted as well as the circuit breaker manufacturers selective coordination tables. 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?
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