1. In these installations, it is best to design the elevator controller so the elevator controller SCCR is adequate for the available fault current. 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. Your Quick and Easy Elevator Code Checklist | Kings III Related Code Sections 802.1.8 Indirect/Special Waste, Elevator Pit Drain or Sump Pump 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 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. It begins by considering metal and nonmetallic wireways. [emailprotected] He also required GFCI protection for the hard-wired sump pump that did not require it. z, /|f\Z?6!Y_o]A PK ! Because they need to move and flex, traveling cables are not required to be in a raceway. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. This is because the material may contribute fuel to a fire that has originated elsewhere. You can email the site owner to let them know you were blocked. See Section 3 of the. 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. This strategy works to improve the flexibility of the traveling cable, but it is contrary to a general NEC rule concerning the paralleling of conductors, which is generally done in very large sizes to avoid unwieldy wire pulls and terminations. The thinking behind this requirement is that the injured worker could have severe hand burns and be unable to operate a conventional doorknob. Something went wrong. These are the individual branch circuits required for car lighting, receptacles, auxiliary lighting and ventilation on each elevator car; individual branch circuits for machine-room and similar location lighting and receptacle; and branch circuits for hoistway pit lighting and receptacle(s). Guidance in determining whether elevator pits meet the definition of In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. For platform lifts and stairway chairlifts, the duty is intermittent. A further requirement concerns elevator-car air-conditioning and heating. As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. Smoke detectors, which are required in all elevator lobbies and elevator equipment rooms, must be connected to the elevator controllers directly by means of auxiliary contacts and wiring, or indirectly by means of output signals from the fire alarm control panel. Similarly, the integrity of the traveling cable is emphasized. However, this can vary depending on building conditions and exterior grade. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Thus, the need for door interlock functionality is recognized. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. 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? 68 | WWW.ELEVATORWORLD.COM | June 2012 Continuing Education . Dan Neeser is a Senior Field Application Engineer with Eatons Bussmann Division. All rights reserved. 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. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. 3. These are the principle NEC 2011 Article 620 mandates. 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 drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. Elevator Pit Requirements | Mike Holt's Forum Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. 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. NEC 2011 Article 620.21(2)(b) states that hard-service cords and junior hard-service cords that conform to the requirements of Article 400 (Table 400.4) are permitted as flexible connections between the fixed wiring on the car and devices on the car doors or gates. +91 8025357028, 2022 Elevator World, LLC. Other requirements: Spa's and Hot Tubs 1996 NEC 15-20 Amp 120 volt Receptacle Requirements for Dwelling units: All outdoor PDF Electric Elevator Checklist Cover Page - Oregon 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. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. Marking the available short-circuit (fault) current on the controller by the equipment installer. Depending on your local codes, you can do this by installing heat or smoke detectors within 24 in. 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. 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. Elevator cab lights require emergency back-up power. Therefore, elevator equipment rooms must maintain a temperature between 50F and 90F. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. Limit switches placed throughout the height of the shaft communicate with the controller and stop the cab at each landing. 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. 974 0 obj <>/Filter/FlateDecode/ID[<64E135C225F1064D91BC8119D14516A9>]/Index[953 36]/Info 952 0 R/Length 105/Prev 204101/Root 954 0 R/Size 989/Type/XRef/W[1 3 1]>>stream However, space is frequently limited within the shaft and as such many ancillary components (shunt trip circuit breakers, fused disconnects) may need to be located outside of the elevator shaft. 354 Morgan Ave. f?3-]T2j),l0/%b 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. 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 disconnecting means is to be located adjacent to or an integral part of the motor controller. Moreover, because motors have a higher starting current than other loads, the overcurrent protection protocol is unique to them and somewhat counterintuitive. 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. First, it is now clear that elevator controllers must be marked by the manufacturer with their SCCR. But, building codes had been in existence for many centuries. For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. 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. All elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. 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. It is also essential that machine-room lighting be totally reliable and separate from the machinery supply to facilitate troubleshooting in the event of elevator problems. First, the traveling cable must be composed of very fine-stranded conductors so it can flex with a minimum of internal stresses, ensuring long service life and reliability. . I've never run into this before. Modern electronic elevator controls can be sensitive to temperature shifts. Part of the reason that elevator usage is extraordinarily safe is that construction and maintenance are regulated by the wonderfully robust ASME A17.1 2007/CSA B44-07 Safety Code for Elevators and Escalators, which contains overall construction and maintenance requirements everything from seismic mandates to machine-room lighting. 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. +;-mka|7! The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. The traveling cable or raceway is also permitted to include shielded conductors and/or one or more coaxial cables. On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. The party responsible for procuring the elevator control panel must state the minimum acceptable SCCR or the maximum available fault current where the controller will be installed. 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). (ASME has a separate document, A18.1-2008 Safety Standard for Platform Lifts and Stairway Lifts). Follow the manufacturers instructions and precautions. Elevators with driving machines located on the car or counterweight, or in the hoistway are permitted outside the specified spaces. Fluid pressure in the cylinder raises and lowers the elevator cab. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. It is further stressed that no provision is to be made to open or close the disconnecting means from any other part of the premises. 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 branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. Section 620.43, Location of and Protection for Cables, provides that traveling cable supports are to be located so as to reduce the possibility of damage due to the cables coming in contact with the hoistway construction or equipment in the hoistway to a minimum. PDF Elevator Acceptance Inspections - Tennessee 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. APPENDIX A 2.2. The surest means of avoiding an arc-flash hazard is to lockout and tagout the electrical service to a controller. This is not the elevator companys responsibility. NFPA 72 requires the control circuit between the Fire Alarm System and the shunt trip be monitored for integrity. In an elevator machine room, where space may be limited in the first place, the working-space mandate must be factored in very early in the design process lest an unthinkable amount of rework be necessary. The Electrical Ups and Downs of Elevator Design | EC&M A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. It states an elevator is permitted to be run by an emergency or standby power system. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. Hydraulic elevator installations are typically supplied from the main switchboard and have an elevator fused switch or circuit breaker in the machine room that serves as the elevator disconnect. Described below are several work practices that may be used to reduce arc-flash hazards when working on energized equipment: David Herres holds a New Hampshire Master Electricians license and has worked as an electrician in the northern part of that state for many years. DOCX 26 80 00 - Elevator Electrical Requirements - University of Illinois All Rights Reserved | Contact Us | Privacy Policy. Any other utilization equipment associated with the elevator PDF Elevator Safety Program - Technical Clarification A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. 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. (g) Stop Switch in Pits. 0 23.254.250.15 The elevator pit discharge system is not required to include an oil separator, except as required by section 1003.4. My reasoning comes from 620.24 (A) and (C). After such an event, it is important that the affected worker is able to escape the area and get to help. We shall now take a look at the principle requirements of Article 620, with particular emphasis on wiring requirements for elevator shafts, machine rooms and cars. However, it is likely that for many elevator controllers, this may not be high enough for the available fault current where they will eventually be installed. The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. And so the needs can be very different. These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). GET YOUR CEUS TODAY, 1998-2021. Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. endstream endobj startxref As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. Each of these performs a different function, and the wiring mandates vary accordingly. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. 4.0 (2 Reviews) (2) CLAIMED . It need not be exactly centered on the equipment, and working spaces of adjacent pieces of equipment may overlap. Something went wrong. Corporate Office 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. Besides the power-supply disconnect discussed, it is provided that elevators have a single means for disconnecting all ungrounded car lights, receptacles and ventilation power-supply conductors for that elevator car. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. NEC 70620.85 Smoke detectors to recall elevators on Phase I recall are required to be located on each landing, above the pit floor, shall: Be weatherproof (NEMA 4). Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. Design practices that are acceptable in some jurisdictions may not be in others. Electricity is often one of the initial services to fail during a storm. He is saying that each pit requires a separate circuit, in other words "dedicated". If we fast forward more than 36 centuries, we see some important new developments in elevator technology. 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. Elevator Sump Requirements - Risi Stone Inc. 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. 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. Another important electrical system design consideration for supplying power to multiple elevators is NEC 620.62. Click to reveal Elevator motors are inherently intermittent duty. Lights and convenience outlets in elevator pits shall be installed to comply with the requirements of CCR, Title 24, Part 3, Article 620. As always, the best advice in all instancesdo your homework, communicate often, and document decisions made. As they review the plans and the construction site, they may have conflicting interpretations or requirements. Guarding: Where possible, install temporary guarding to protect from inadvertent contact. However, when I've put in elevators, NEC seems to always take a back seat to ANSI, which seems . In a time when increasing value is placed on even small amounts of real estate, elevator design must strive to configure, efficiently control and drive elements to whatever degree possible, and that is the thinking behind some alternate locations for these structures. Good documentation is of key importance to recalling what decisions were made and why. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. This clear working space must be 30 in. The pump sends hydraulic fluid from the reservoir to the cylinder, buried deep below the elevator shaft. 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) or larger, not over 6 ft. in length. Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. CLAIMED . 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. Cloudflare Ray ID: 7a2fbe9ebd7e2fe8 If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. The conduit alone can't act as the grounding means. 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. These conductors may be covered with suitable shielding for telephone, audio, video or higher-frequency communications circuits. You must locate this key switch at the main lobby or at the building fire command center. A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. 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. The disconnecting means is also to be a listed device. Inspecting Elevator Power Wiring - IAEI Magazine Car air-conditioning and heating units 3. These 29 CFR 1910.146 (c) (8) requirements are: 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. You are seeing this message for one of three reasons: You have reached your limit of free content. 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.
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