Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. We generally think of the 19th century as the great age of building codes. 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. Though I understand how someone might argue two. NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. The architect has a choice of either traction or hydraulic elevators. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. Hazards created by water, snow or condensation in the work area can cause slips, falls and accidental contact. 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. Second, it must be configured so as to eliminate any chance of tangling or chafing against the inner surface of the hoistway or items mounted on it. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. For platform lifts and stairway chairlifts, the duty is intermittent. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation. Reinforcing NEC 110.3(B) and NEC 110.10 to require the elevator controller marked SCCR to be equal to or greater than the calculated and 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. The electrical conductors and equipment for non-mine elevators that extend below grade are under NEC jurisdiction. Something went wrong. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc 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 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. Finally, in 1897, the first National Electrical Code (NEC) appeared. This is typically accomplished via a shunt trip device. As stated in Section 7 of the Elevator Industry Field Employees Safety Handbook: Unless it is not feasible, (i.e. The two primary hazards are fire and electric shock or arc flash, although there are others. charlie b. NEC Article 0: Elevator art by David Herres Continued. 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). Where a feeder powers more than one elevator, you need selective coordination; the OCPDs must be series-designed so a fault at one of the elevators will be cleared by only the OCPD serving it. 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. 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. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. The panel further clarified that the marked SCCR value must be adequate for the available fault current to ensure a safe installation. If it kills the son of the owner, the son of that builder shall be put to death.. Selective coordination is also required for multiple elevators per NEC 620.62. To safeguard the passengers and electrical equipment, ASME A17.12.8.2.3.2 requires the power source to the elevator control panel to shut down prior to the discharge of water from a sprinkler head. Because they need to move and flex, traveling cables are not required to be in a raceway. IAEI News Magazine. 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. This is because the material may contribute fuel to a fire that has originated elsewhere. wide or the width of the equipment, whichever is greater. The traveling cable, of necessity, is exempted. The feeder OCPD needs to remain closed so the remaining elevators have power and continue to function. And so the needs can be very different. In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. You need at least one 120VAC GFCI-protected receptacle at each location. Special conditions: Troubleshooting in wet, hot or cold conditions calls for extra caution. There are options available to achieve this depending upon the customers needs. 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. No provision is to be made to automatically restore power. 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. Requirements for commercial garages per the National Electrical Code. The demand factors are given in Table 620.14, which allows significant reductions as the number of motors is increased. This may be countered by providing good machine-room ventilation. Through numerous editions, the NEC has, to a great extent, mitigated the hazards accompanying widespread use of electricity, particularly with respect to elevator technology. NFPA 72 requires the control circuit between the Fire Alarm System and the shunt trip be monitored for integrity. 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 elevator controller manufacturer must determine the required elevator controller SCCR as stated in the elevator controller specification and provide an elevator controller SCCR that is equal to or greater than the available fault current thats indicated in the design documents where there are multiple elevator controllers at different locations. 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. In order to aid enforcement, the panel additionally required marking the available fault current at the elevator controller. Cross-sectional areas of wireways are found by multiplying the two interior dimensions.) All equipment in a machine room-less design is installed within the elevator shaft or exterior compartment near the elevator shaft, including the elevator controller and the elevator disconnecting means. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. Weight (passengers, freight, car and attendant machinery) may be fairly substantial, and speed is significant. One. above the seal plate, adjacent to the ladder. An exception provides that liquid-tight flexible metal conduit or liquid-tight flexible nonmetallic conduit 3/8 in. Hoistway pit lighting and receptacles 5. But by understanding how these items fit together and what purpose they serve, you can have a successful project. 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. . The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. 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. 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. U.S. Latham, NY Shopping Miscellaneous Retail Stores, NEC Wheelchair lifts EazyLift Elevators, . The light switch shall be located so to be accessible from pit access door. The light switch in the pit must be mounted 42 in. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ If the entire feeder/branch circuit assembly were to be protected in the conventional manner, the motor would cut out long before reaching operating speed. 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. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. Performance & security by Cloudflare. Article 620s Definitions section includes two terms that describe spaces not attached to the outside of a hoistway. The surest means of avoiding an arc-flash hazard is to lockout and tagout the electrical service to a controller. 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. 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. 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. Dan Neeser is a Senior Field Application Engineer with Eatons Bussmann Division. For just $7.99 per month, you can gain access to more than 5,000 articles from all Elevator World Publications, this includes EW Global, EW Europe, EW India, EW Middle East, EW Turkey, and EW UK. For circuit breakers, time-current curves must be consulted as well as the circuit breaker manufacturers selective coordination tables. Sumps and sump pumps in pits, where provided, shall be covered. (f) Illumination of Pits. +;-mka|7! 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. +90 (216) 348 4876, India Office 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. Related Code Sections 802.1.8 Indirect/Special Waste, Elevator Pit Drain or Sump Pump The two main types of elevators are hydraulic and traction. As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. or larger, not over 6 ft. in length. 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. Please check your entries and try again. Firefighters can then use portable telephone handsets in combination with the jacks and cabling. 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 light switch for the equipment room must be adjacent to the entrance door on the latch side. Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. EazyLift Elevators, Stairlifts, Wheelchair Lifts & Ramps. 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. It begins by considering metal and nonmetallic wireways. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. 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. A raceway that comes loose on the inside of a hoistway could catch on a moving car, causing immense damage and hazard to users. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. You must locate this key switch at the main lobby or at the building fire command center. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. Notice the definition mentions the full range of operating times. 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. 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. This, however, can result in a dramatic increase in cost, space availability (lack thereof), and reduced efficiency. Get more of Elevator World. Mike Holt. 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. 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? 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. 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. Society of Mechanical Engineers. If you can illuminate the pit using lights that are "above the top of the pit" (whatever that . We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. above the pit floor, shall: Be weatherproof (NEMA 4). Many people use portable generators until power is restored. 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. 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) In all cases, the working space must permit at least a 90 opening of equipment doors or hinged panels. 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. It is worth noting that these NEC terms, used throughout Article 620, have been chosen to correlate with A17.1-2007 usage. Here again, the lighting is not to be connected to a GFCI, whereas such protection is required for the receptacle(s). hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] 6 feet, and shall meet the requirements of NEC 70 620.21(A)(1)(d). 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. The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. 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. 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. Sign up for our free e-newsletter. Any other utilization equipment associated with the elevator 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. The reason the NEC CMP 12 added these requirements, as shown in the panel statements, directly relates to the concern that elevator controllers can be installed in locations where the available fault current can be high and the inspector may not be able to clearly determine the SCCR of the elevator controller unless it is marked on the equipment. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. 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. Metal grating shall be installed over the hole that sits flush with the pit floor. 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. The next section, 620.36, concerns different systems in one raceway or traveling cable. The lighting switch shall be located so as to be readily accessible from the pit access door. These 29 CFR 1910.146 (c) (8) requirements are: 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 Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. 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. 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. f?3-]T2j),l0/%b 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. 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. You are seeing this message for one of three reasons: You have reached your limit of free content. Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. [emailprotected] These may include: The author would like to recognize Jonathan Kennedy for his assistance in creating this article. The conductors must be in their original sheaths or grouped together and taped or corded. Personal protective equipment (PPE): Use appropriate PPE to protect body parts within the range of 3-16 in. However, when I've put in elevators, NEC seems to always take a back seat to ANSI, which seems . 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. endstream endobj 954 0 obj <. 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. Moreover, because motors have a higher starting current than other loads, the overcurrent protection protocol is unique to them and somewhat counterintuitive. These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). 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. As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. hbbd```b``+3dL `Y[gw9`RLJO*A$w$@L`F*{|0 P 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. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. 0 Marking the available short-circuit (fault) current on the controller by the equipment installer. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. This position paper is written to provide guidance to members whose employees are engaged in elevator-industry work that might expose them to arc-flash hazards, and to assist members in complying with applicable OSHA and National Fire Protection Association (NFPA) standards. For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. 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.
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