The basic idea is that there must be a separate, dedicated circuit for car lights, receptacles and ventilation on each car. 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. On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. Heating and air-conditioning equipment located on the car must not be in excess of 600 V. All live parts of electrical apparatuses are to be enclosed to protect workers and the public against accidental contact. 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 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. 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. As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. As for height, the working space must extend from the grade, floor or platform to 6-1/2 ft. or the height of the equipment, whichever is greater. This website is using a security service to protect itself from online attacks. 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. (ASME has a separate document, A18.1-2008 Safety Standard for Platform Lifts and Stairway Lifts). 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. Corporate Office You need at least one 120VAC GFCI-protected receptacle at each location. (A) tells us that the lighting and receptacle (s) for the pit must be on separate circuits. He is saying that each pit requires a separate circuit, in other words "dedicated". 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. The code notes that elevator rails or other hoistway equipment are not to be used as the grounding conductor for lightning-protection systems. Granle is a licensed professional engineer with Sebesta Blomberg & Associates, Rochester, Minn. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/, ABCs Construction Backlog Indicator Down to Start 2023, The Most Popular Code Quizzes of the Week from 2021, The 10 Most Popular Photo Galleries of 2021, Whats Wrong Here? %PDF-1.5
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(g) Stop Switch in Pits. 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. Cylinders in hydraulic elevators usually aren't suitable for buildings taller than five stories. The traveling cable, of necessity, is exempted. Many of these are for portable lighting.). Depending on your local codes, you can do this by installing heat or smoke detectors within 24 in. 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. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. Luminaires must be lensed or equipped with wire guards to protect the lamps. Your IP: -inch conduit is needed to the sump pump. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. Sumps and sump pumps in pits, where provided, shall be covered. All rights reserved. ), 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. 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. A surge of immigration to the U.S., the end of slavery and, on both sides of the Atlantic Ocean, a burgeoning industrial revolution ignited an acceleration in new building. Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. 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. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. 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. Mike Holt. The elevator equipment room that serves a hydraulic elevator is almost always located on the lowest floor adjacent to the elevator shaft. 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. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. 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. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. 68 | WWW.ELEVATORWORLD.COM | June 2012 Continuing Education . 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. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. If elevators are supplied by the emergency, legally required standby or critical operation power systems, then selective coordination is required per the 2017 NEC in 700.32, 701.27 or 708.54. For example, an inadequately supported ceiling fan could fall and cause injury or property damage. Metal grating shall be installed over the hole that sits flush with the pit floor. (e) Pit Maintenance. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. [emailprotected] If it kills the son of the owner, the son of that builder shall be put to death.. 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. 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. Such design innovations require sophisticated wiring strategies. from components that are not otherwise guarded. 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. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U
^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ Hint: Duct Tape to the Rescue, NEC: Air Conditioning and Refrigerating Equipment Part 5. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. 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. After such an event, it is important that the affected worker is able to escape the area and get to help. from the exposed components, and the incident energy calculated at 18 in. wide or the width of the equipment, whichever is greater. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. It does specify wiring methods allowed, though, in 620. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. Society of Mechanical Engineers. 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. Upon loss of power, the rescuvator controls the cab, lowers it to the designated floor, and opens its doors. It is worth noting that these NEC terms, used throughout Article 620, have been chosen to correlate with A17.1-2007 usage. The usual scenario for electrical injury is shock when electrical current passes through the human body. The panel further clarified that the marked SCCR value must be adequate for the available fault current to ensure a safe installation. Good documentation is of key importance to recalling what decisions were made and why. %%EOF
Traditionally, the electrical system design engineer has given little attention to the elevator controller. 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. 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. This accomplishes two functions. NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) Instruments: Use category III multimeters and be familiar with their use and limitations. Each fused switch or circuit breaker in the panelboard is used as an elevator disconnect. 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. 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). The action you just performed triggered the security solution. 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. ASME A17.1, Section 2.2.5, National Electrical Code, Rule 620-85 4. 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. 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 will normally require you to vent the room with a fire/smoke damper and include smoke detector signals in the control logic. As stated in Section 7 of the Elevator Industry Field Employees Safety Handbook: Unless it is not feasible, (i.e. These are covered for generic, non-elevator specific use in earlier articles, 376 and 378, in Chapter 3, Wiring Methods and Materials. 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. Where multiple driving machines are connected to a single elevator, there is to be one disconnecting means to disconnect the motor(s) and control-valve-operating magnets. Personal protective equipment (PPE): Use appropriate PPE to protect body parts within the range of 3-16 in. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. . 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). Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. 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. Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. My reasoning comes from 620.24 (A) and (C). 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. 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. Marking the available short-circuit (fault) current on the controller by the equipment installer. . 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. These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). Utility-owned electrical structures not directly concerned with electrical generation, transmission and distribution are NEC regulated. This is not the elevator companys responsibility.
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