Metal grating shall be installed over the hole that sits flush with the pit floor. Society of Mechanical Engineers. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. Building codes were deemed necessary to protect the public against shoddy builders and outmoded construction techniques. : inspecting; troubleshooting; observing; etc.) [emailprotected] Car lighting, receptacles and ventilation 2. 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. 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. 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. Similarly, the integrity of the traveling cable is emphasized. One. You are seeing this message for one of three reasons: You have reached your limit of free content. 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. Through numerous editions, the NEC has, to a great extent, mitigated the hazards accompanying widespread use of electricity, particularly with respect to elevator technology. 354 Morgan Ave. The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. (To design and install an elevator for a Class I, Division 1 location would be quite an undertaking.). [emailprotected] 0 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. 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. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. 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. Dan Neeser is a Senior Field Application Engineer with Eatons Bussmann Division. Many people use portable generators until power is restored. 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. Section 725.45 concerns the location of overcurrent devices and provides for feeder and branch-circuit taps, transformer primary side overcurrent device location and overcurrent device location at the input side of electronic power sources. 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. One way to achieve this is by paralleling wires, i.e., connecting the runs at both ends so they are physically like two wires but electrically one. 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. 2. Get more of Elevator World. ranged from 0.06 cal/cm2 to 0.95 cal/cm2, which indicates that the arc-flash hazard to employees is primarily to the hands and arms. (C) Duplex Receptacle. 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. It is of great importance that power to the various elevator functions can be quickly and reliably removed from the loads in case of emergency or for maintenance and troubleshooting. To achieve flexibility and endurance, traveling cable is more finely stranded and, where possible, separated into discrete conductors. The fan should be on a dedicated circuit. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. Flexible cords and cables in lengths not to exceed 6 ft. of a flame-retardant type and located to be protected from physical damage are permitted in machine rooms without being installed in a raceway. wide or the width of the equipment, whichever is greater. CLAIMED . +;-mka|7! 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. This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. If you can illuminate the pit using lights that are "above the top of the pit" (whatever that . ASME A17.1 . 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. The light switch for the equipment room must be adjacent to the entrance door on the latch side. Special conditions: Troubleshooting in wet, hot or cold conditions calls for extra caution. 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. 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. 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. +1-251-479-4514 | [emailprotected], Trkiye Office 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. Machine room/control space lighting and receptacles 4. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. Beginning with Article 320, Armored Cable (Type AC) and concluding with Article 398, Open Wiring on Insulators, each code-sanctioned cable and raceway is treated, ranging from the familiar Type NM (trade name Romex) to the exotic Integrated Gas Spacer Cable (Type IGS). So, we see that for elevator work, greater fill is allowed. Design practices that are acceptable in some jurisdictions may not be in others. As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. !>x=yy Bvv8?~e PK ! They are to be part of listed equipment, a driving machine or a driving-machine brake. 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. -inch conduit is needed to the sump pump. 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) endstream endobj 954 0 obj <. Follow the manufacturers instructions and precautions. Jul 15, 2021. Therefore, there will be two signals to the elevator control panel related to smoke detectors: one from the designated floor smoke detector and another combined signal from the smoke detectors at the other lobby landings and in the equipment room. Where voltages exceed 600, a sign reading DANGER HIGH VOLTAGE is required. 4.0 (2 Reviews) (2) CLAIMED . He also required GFCI protection for the hard-wired sump pump that did not require it. Where necessary, it is mandated that suitable guards be provided to protect the cables against damage. The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. 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. (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. charlie b. Additional branch circuits are to supply other utilization equipment not covered above. Many NEC articles address voltage limitations, and Article 620 is no exception. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. U.S. Latham, NY Shopping Miscellaneous Retail Stores, NEC Wheelchair lifts EazyLift Elevators, . If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) Hoistway pit lighting and receptacles 5. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. This is typically accomplished via a shunt trip device. Click to reveal All rights reserved. As greater numbers of elevators are added, the likelihood of them all operating simultaneously decreases so that it is permissible to reduce the feeder ampacity. Firefighters can then use portable telephone handsets in combination with the jacks and cabling. Something went wrong. After such an event, it is important that the affected worker is able to escape the area and get to help. 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). Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. 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. Flexible cords and cables part of listed equipment operating at 30 V (42 VDC) or less, similarly supported and protected, jacketed and flame retardant, are permitted. (Cross-sectional areas of conductors are given in Chapter 9, Tables 5 through 8. Dont troubleshoot unless you can keep your shoe/boot soles dry. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. Below is a summary of these new 2017 NEC sections: In order to comply with these requirements a chain of events must occur. 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. The light switch shall be located so to be accessible from pit access door. We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. The elevator pit discharge system is not required to include an oil separator, except as required by section 1003.4. 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.
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