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The basic requirement is for minimum clear distances of various depths for equipment operating at 600 V or less, nominal, depending upon voltage to ground and lateral distance to insulated or grounded surfaces or exposed live parts (not an issue in elevator machine rooms). A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. 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. Article 620s Definitions section includes two terms that describe spaces not attached to the outside of a hoistway. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. Cloudflare Ray ID: 7a2fbe9ebd7e2fe8 The conduit alone can't act as the grounding means. Motor controllers are permitted outside the spaces specified above. Machine room/control space lighting and receptacles 4. 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. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Such vehicles include, but are not . If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. 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. above the seal plate, adjacent to the ladder. proved for elevator locations - car, hoistway, pit and a-chine roo equireents in Article odify the articles in Chap - ter For eaple, it is stated that the cross-sectional area 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. 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. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. If the building has emergency power available, use it to supply the cab lights. NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. The thinking behind this requirement is that the injured worker could have severe hand burns and be unable to operate a conventional doorknob. Get more of Elevator World. IAEI News Magazine. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. Flexible cords and cables, or conductors grouped together and taped or corded, are permitted to be installed without a raceway. You need at least one 120VAC GFCI-protected receptacle at each location. The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. Flexible cords and cables (same conditions as within hoistways). Based on the analysis, the arc-flash boundaries at the elevator/escalator controllers ranged from 3-16 in. The conductors must be in their original sheaths or grouped together and taped or corded. 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. The AHJ is saying that this is a violation of 620.23. It is further specified the machine-room lighting switch be located at the point of entry. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. The next section, 620.36, concerns different systems in one raceway or traveling cable. You are seeing this message for one of three reasons: You have reached your limit of free content. On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. Society of Mechanical Engineers. 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. Depending on your local codes, you can do this by installing heat or smoke detectors within 24 in. NEC specifies Hoistway wiring, and doesn't seem to distinguish between hoistway and pit. 2.2.6.1 This switch shall be so located as to be acces-sible from the pit access door. 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. Requirements for commercial garages per the National Electrical Code. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. Motor feeder short circuit and ground-fault protection must be as required in Article 430, Part V for all motors. 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. If this is not done and the available fault current exceeds the elevator controller SCCR, other solutions to reduce fault current must be reviewed or equipment changes and field evaluations may be needed. A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. Suspending the cables from the supports by a means that automatically tightens around the cable when tension is increased for unsupported lengths up to 200 ft. An NEC Informational Note defines unsupported lengths. 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 fan should be on a dedicated circuit. In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. or larger, not over 6 ft. in length. h-`7 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. Corporate Office The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. 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. Sign up for our free e-newsletter. These conductors may be covered with suitable shielding for telephone, audio, video or higher-frequency communications circuits. 354 Morgan Ave. Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. 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. He has focused on writing since 2006, having written for such magazines as ELEVATOR WORLD, Electrical Construction and Maintenance, Cabling Business, Electrical Business, Nuts and Volts, PV Magazine, Electrical Connection, Solar Connection, Solar Industry Magazine, Fine Homebuilding Magazine and Engineering News. The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. C.1.4 ELEVATOR PIT REQUIREMENTS 1. ) > 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 An example would be the elevator, as well as all wiring in a utility-owned administration building. 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. 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. Where voltages exceed 600, a sign reading DANGER HIGH VOLTAGE is required. Many new buildings are incorporating an elevator design that does not include an equipment room (sometimes called machine room-less elevators). 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. 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. This is somewhat broader than A17.1-2007/B44-07. NEC Article 0: Elevator art by David Herres Continued. Freight Elevator Door Control: An Opportunity for Wireless Technology. It does specify wiring methods allowed, though, in 620. Sumps and sump pumps in pits, where provided, shall be covered. Hard-service cords are permitted only as flexible connections for the top-of-car operating device or the car-top work light. +91 8025357028, 2022 Elevator World, LLC. Part VII, Overcurrent Protection, divides this topic into four categories for elevators and similar equipment, depending upon the nature of the specific equipment: For operating devices and control and signaling circuits, protection against overcurrent is in accordance with the requirements of Sections 725.43 and 725.45. 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. 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. GFCIs in elevator pits During an inspection of the elevators in a commercial building, the state inspector failed us for using a GFCI-type circuit breaker to protect a receptacle in the elevator pit. 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. Such cable groups are to be supported at intervals not over 3 ft. and located so as to be protected from physical damage. +1-251-479-4514 | [emailprotected], Trkiye Office 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. NEC has a further note that the term wheelchair lift has been changed to platform lift.. You need to Subscribe to continuing reading. Metal grating shall be installed over the hole that sits flush with the pit floor. 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. This is because the material may contribute fuel to a fire that has originated elsewhere. The basic rule for conductor fill of a metal wireway, as given in Article 376, is that the sum of the cross-sectional areas of all contained conductors at a cross section of a wireway is not to exceed 20% of the interior cross-sectional area of the wireway. Performance & security by Cloudflare. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. Additionally, duty on elevator and dumbwaiter motors is rated as intermittent, whereas duty on escalator and moving-walk motors is considered continuous. 23.254.250.15 The various items to consider and check when designing for elevator installations have many potential pitfalls. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. As always, the best advice in all instancesdo your homework, communicate often, and document decisions made. 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. Hazards created by water, snow or condensation in the work area can cause slips, falls and accidental contact. The code exempts some fairly broad areas where compliance is not expected. 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. Corporate Office They are permitted to be run without raceway when used inside the hoistway, on the elevator car, hoistway wall, counterweight, or controllers and machinery located inside the hoistway, provided they are in their original sheaths. 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. 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. 0 NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. 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 example, an inadequately supported ceiling fan could fall and cause injury or property damage. 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. GFI Receptacles: GFI receptacles shall be required in all elevator machine rooms, machinery spaces and elevator pit areas. The two main types of elevators are hydraulic and traction. Sign up for our free e-newsletter. In contrast to the lighting, these receptacles must be connected to GFCI devices. Dec. 21, 2010. 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. These are the principle NEC 2011 Article 620 mandates. 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. To achieve flexibility and endurance, traveling cable is more finely stranded and, where possible, separated into discrete conductors. Within cars, these additional wiring methods are permitted: The following additional wiring methods are permitted on the car assembly in lengths not exceeding 6 ft.: Within machine rooms, these additional wiring methods are permitted: The following wiring methods are permitted on the counterweight assembly in lengths not to exceed 6 ft.: Having looked at NEC 2011 mandates for elevator and related equipment installations, we will cover wiring methods, overcurrent protection, grounding and other related NEC provisions in part two of this series , running in the April 2012 issue of ELEVATOR WORLD. (C) Duplex Receptacle. It states an elevator is permitted to be run by an emergency or standby power system. 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. 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. 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. 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. 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. This is typically accomplished via a shunt trip device. Your IP: Click to reveal Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing.