Special conditions: Troubleshooting in wet, hot or cold conditions calls for extra caution. Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. You need to Subscribe to continuing reading. Adhering to the requirements will ensure a hazard-free electrical installation. ASME A17.1, Section 2.2.5, National Electrical Code, Rule 620-85 4. Escalator Pit Light and Receptacle 620.23 | Mike Holt's Forum Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. Hydraulic elevators are typically more cost effective and used for buildings up to 5-6 stories. of the sprinkler heads. %%EOF
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. NEC Article 620: Elevators, Part I - Elevator World, Inc. Sign up for our free e-newsletter. 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) 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. GFCIs in Elevator Pits, Receptacles and More Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. For current-limiting fuses, the information to achieve selective coordination has been available for many years in fuse amp ratio tabular form. He also required GFCI protection for the hard-wired sump pump that did not require it. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. 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. You must locate this key switch at the main lobby or at the building fire command center. Hard-service cords and junior hard-service cords are permitted as flexible connections between the fixed wiring on the car and devices on the car doors or gates. Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. 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. In all cases, the working space must permit at least a 90 opening of equipment doors or hinged panels. Requirements in Article 620 modify the articles in Chapter 3. 836 Troy Schenectady Road Latham, NY 12110 . Elevators with driving machines located on the car or counterweight, or in the hoistway are permitted outside the specified spaces. 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. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. 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.. %PDF-1.5
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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. Your IP: Car lighting, receptacles and ventilation 2. 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. Recommendations for EazyLift Elevators, Stairlifts, Wheelchair Lifts or larger, not exceeding 6 ft. in length, are permitted between control panels and machine motors, machine brakes, motor-generator sets, disconnecting means and pumping motors and valves. Many professionals believe the NEC is applicable only for voltages over a certain level, but that is not the case. 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). Such design innovations require sophisticated wiring strategies. Elevator Sump Requirements - Risi Stone Inc. Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. Every building is different. Something went wrong. In many cases, the overcurrent protective devices that are suitable for this level of protection are current-limiting fuses rather than a traditional circuit breaker. (All intentionally grounded elements must be held at equal potential.) The thinking behind this requirement is that the injured worker could have severe hand burns and be unable to operate a conventional doorknob. APPENDIX A 2.2. 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. U.S. Latham, NY Shopping Miscellaneous Retail Stores, NEC Wheelchair lifts EazyLift Elevators, . Other codes and standards interact with the NEC, and it is necessary to see how they all work together in order to create safe and compliant elevator designs/installations. 3016. Pits for Elevators. - California Department of Industrial Relations 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. 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. A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. Metal grating shall be installed over the hole that sits flush with the pit floor. This is not the elevator companys responsibility. [emailprotected] No provision is to be made to automatically restore power. First, the ATS signals the elevators that it's about to switch over to emergency power preferably 30 sec or more prior to switching, which allows the elevator controller to bring each elevator cab to the nearest landing and stop, thus protecting the motors and electrical system. Flexible cords and cables that are components of listed equipment and used in circuits operating at 30 V (42 VDC) or less are permitted in lengths not to exceed 6 ft., provided the cords and cables are supported and protected from physical damage and are of a jacketed and flame-retardant type. As recommended in NFPA 70E, the National Elevator Industry, Inc. (NEII) commissioned an arc-flash hazard analysis (in compliance with IEEE Standard 1584-2002 for procedures for calculating the incident energy of the arc flash) by an independent consultant to determine at what level an arc-flash hazard exists to employees who work on energized elevator equipment. 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). Marking the available short-circuit (fault) current on the controller by the equipment installer. 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. 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. 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). hbbd```b``+3dL
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A raceway that comes loose on the inside of a hoistway could catch on a moving car, causing immense damage and hazard to users. Compliance with the 2017 NEC for Elevator Controllers 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. This is somewhat broader than A17.1-2007/B44-07. The elevator pit discharge system is not required to include an oil separator, except as required by section 1003.4. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. (To design and install an elevator for a Class I, Division 1 location would be quite an undertaking.). A different occurrence involves exposure to the explosive blast when there is a line-to-line or line-to-ground arc blast. All Rights Reserved | Contact Us | Privacy Policy. The fan should be on a dedicated circuit. 3. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. It is stated that traveling cables are to be suspended at the car and hoistway ends, or counterweight end where applicable, so as to reduce the strain on the individual copper conductors to a minimum. For example, wiring that is under exclusive utility control and has to do with the generation and distribution of electrical power is not NEC regulated. Such vehicles include, but are not . NEC Article 620 Part V, Traveling Cables, is driven by two major issues. Because of this, there is often a communications gap between the electrical system designer, whose design typically stops at the required elevator disconnecting means, and the architect who designs the elevator system. 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. 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. Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. Shi Liguang, Yao Lianghong, Luo Zhiqun and Wan Jianru, Constructional Stretch and Hoist-Rope Tension . 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. 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. Additionally, duty on elevator and dumbwaiter motors is rated as intermittent, whereas duty on escalator and moving-walk motors is considered continuous. The next section, 620.36, concerns different systems in one raceway or traveling cable. Lights and convenience outlets in elevator pits shall be installed to comply with the requirements of CCR, Title 24, Part 3, Article 620. This clear working space must be 30 in. Get more of Elevator World. 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. Cross-sectional areas of conduits are given in Chapter 9, Table 4. ), 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. 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. 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. Cables used in Class 2 power-limited circuits are permitted between risers and signal equipment and operating devices, provided they are supported and protected from physical damage and are of the jacketed and flame-retardant type. PDF Elevator Safety Program - Technical Clarification NEC Article 620: Elevators, Part 2 - Elevator World, Inc. 68 | WWW.ELEVATORWORLD.COM | June 2012 Continuing Education . Design practices that are acceptable in some jurisdictions may not be in others. This may be countered by providing good machine-room ventilation. 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. Also located in this room might be, but not limited to: exhaust fan, cooling unit (depending on local requirements and/or requirements set forth by the individual elevator supplier), lighting, voice and/or data drop serving the elevator cab emergency phone, elevator controller primary fused disconnect, elevator feeder shunt-trip circuit (i.e., shunt-trip circuit breaker), elevator cab lighting fused switch, and convenience receptacle(s). In order to comply, the electrical system designer must determine the maximum available fault current at the elevator disconnecting means and assure the elevator disconnecting means overcurrent protective device will clear any overcurrent condition, up to the maximum available fault current, before any upstream overcurrent devices will operate. NEC Article 0: Elevator art by David Herres Continued. You'll need to run telephone cables to the equipment room control panel, but the elevator supplier will take care of getting the cables to the elevator cab. Modern electronic elevator controls can be sensitive to temperature shifts. If it kills the son of the owner, the son of that builder shall be put to death.. 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. charlie b. 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. 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. High-rise buildings pose additional concerns. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. You need at least one 120VAC GFCI-protected receptacle at each location. Provide continuous, non -slip, horizontal rungs every 12" for the full height of the pit ladder. 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). Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. q!^mDtsnEX3_ shvqu+X9@w3gSj`g . As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. 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. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG
L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc Hoistway pit lighting and receptacles 5. Where necessary, it is mandated that suitable guards be provided to protect the cables against damage. The sump pump/drain shall have the capacity to remove a minimum of 11.4 m. 3 /h (3,000 gal/h) per elevator. 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. 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. As always, the best advice in all instancesdo your homework, communicate often, and document decisions made. +91 8025357028, 2022 Elevator World, LLC. 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. [emailprotected] The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. +1-251-479-4514 | [emailprotected], Trkiye Office Proper selective coordination in a multi-elevator installation on the same feeder ensures if one elevator develops a fault, the other units will not be shut down. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. Many of these are for portable lighting.). 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. Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. 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. 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. These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement.
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