Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. (e) Pit Maintenance. It is important to note, that these selective coordination tables can indicate a lack of selective coordination at a given fault current for circuit breakers that do not show overlap on the time-current curves of the circuit breakers. Reinforcing NEC 110.3(B) and NEC 110.10 to require the elevator controller marked SCCR to be equal to or greater than the calculated and But, building codes had been in existence for many centuries. 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. Convenience receptacles and lighting for maintenance purposes are required at the base of the pit and, in some instances (elevator manufacturer dependent), at the top of the elevator shaft. 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. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. 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. 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. PK ! The light switch for the equipment room must be adjacent to the entrance door on the latch side. Dan Neeser is a Senior Field Application Engineer with Eatons Bussmann Division. 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. 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. Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. . Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. 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. [emailprotected] 836 Troy Schenectady Road ; Latham, NY 12110 . 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. 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. The basic wiring methods are rigid-metal, rigid nonmetallic or intermediate-metal conduit; electrical metallic or rigid nonmetallic tubing; wireways; or Type MC, MI or AC cable, unless otherwise permitted. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. Instruments: Use category III multimeters and be familiar with their use and limitations. Your elevator supplier will take care of all the wiring and related code requirements for the elevator cab and the various controls. Metallic articles: Remove metallic articles such as watches, chains, bracelets, earrings, belt buckles and keychains before troubleshooting. 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. Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. With the new elevator controller requirements, more attention will be focused on the elevator system. (A) tells us that the lighting and receptacle (s) for the pit must be on separate circuits. Years may lapse between the design and installation stages of a project. Furthermore, at least one 125-V, single-phase, 15- or 20-amp duplex receptacle is to be provided in each machine room or similar location. 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. , !! Requirements for commercial garages per the National Electrical Code. GFI Receptacles: GFI receptacles shall be required in all elevator machine rooms, machinery spaces and elevator pit areas. [emailprotected] The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. 3. 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. In contrast to the lighting, these receptacles must be connected to GFCI devices. 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. ) > 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 Your IP: You must locate this key switch at the main lobby or at the building fire command center. NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. ), advise the building owner to correct the condition. Article 511 provides the requirements for commercial garages areas used for the storage or repair of self-propelled vehicles that use combustibles (liquid or gas) for power. GET YOUR CEUS TODAY, 1998-2021. 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. The code is not concerned with the efficiency or sophistication of equipment that it covers, except insofar as safety (in terms of human injury and property damage) is concerned. Such vehicles include, but are not . Upon loss of power, the rescuvator controls the cab, lowers it to the designated floor, and opens its doors. APPENDIX A 2.2. 2.2.6.1 This switch shall be so located as to be acces-sible from the pit access door. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. 23.254.250.15 The thinking behind this requirement is that the injured worker could have severe hand burns and be unable to operate a conventional doorknob. 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. Get directions, reviews and information for Eazylift Albany LLC in Latham, NY. 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. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. Utility-owned electrical structures not directly concerned with electrical generation, transmission and distribution are NEC regulated. This may be countered by providing good machine-room ventilation. Elevator cab lights require emergency back-up power. For example, an inadequately supported ceiling fan could fall and cause injury or property damage. charlie b. Click to reveal The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. For instance, a typical elevator controller may traditionally have SCCR ratings from 5 to 10 kA. Where the elevator shaft and/or equipment room has a sprinkler fire suppression system installed, the elevator Code requires main line power to the elevator be removed prior to the application of water. The feeder OCPD needs to remain closed so the remaining elevators have power and continue to function. Adhering to the requirements will ensure a hazard-free electrical installation. 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. Mobile, AL 36606 USA Electricity is often one of the initial services to fail during a storm. For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. (All intentionally grounded elements must be held at equal potential.) 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. 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. 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. Use the below learning-reinforcement questions to study for the Continuing Education Assessment Exam available online at www.elevatorbooks.com or on page 111 of this issue. Name the principal code other than NEC that pertains to elevator design/installation. What is the definition of the machine room? Why are voltage limitations important? In which areas must live parts be enclosed? Why are feeder demand factors permitted for multiple elevators? 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). If a hydraulic elevator loses power because a heat detector goes off or for any other reason it could trap occupants for an unpleasant amount of time. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. While the definitions are straightforward, their deployment in real-life building projects involves enormous legal and moral implications, given the fact that we are carrying large numbers of people hundreds of feet above the earths surface on a daily basis. All rights reserved. Get more of Elevator World. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc Some elevator controller manufacturers believe this is an issue for the electrical system designer and installer to address and remedy by adding impedance to the system for lowering the available fault current. All equipment in a machine room-less design is installed within the elevator shaft or exterior compartment near the elevator shaft, including the elevator controller and the elevator disconnecting means. 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.. NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. 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. After such an event, it is important that the affected worker is able to escape the area and get to help. Pit light with guard (ten foot candles min. It states an elevator is permitted to be run by an emergency or standby power system. 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. It provides that where more than one driving-machine disconnecting means is supplied by a single feeder, the overcurrent protective devices in each disconnecting means are to be selectively coordinated with any other supply side overcurrent protective devices. 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. 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. The same figure applies to nonmetallic wireways. 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. Sign up for our free e-newsletter. The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. Part X, Emergency and Standby Power Systems, is simple and straightforward. The hazards are external to the equipment enclosure since equipment SCCR testing and evaluation criteria for product standards are most often performed with the enclosure doors closed and latched, and the fault occurring external to the enclosure. (A) Separate Branch Circuit. The electrical conductors and equipment for non-mine elevators that extend below grade are under NEC jurisdiction. The demand factor ranges from 1.00 for one elevator on a single feeder to 0.72 for 10 or more elevators on a single feeder. Guarding: Where possible, install temporary guarding to protect from inadvertent contact. The condition is that all conductors must be insulated for the maximum voltage applied to any conductor within the cables or raceway system, and all live parts of the equipment must be insulated from ground for this maximum voltage. The proposals resulted in adding new requirements in the 2017 NEC for: This article will also discuss other Code requirements that include selective coordination for elevators that are supplied by emergency, legally required standby or critical operation power systems or multiple elevators supplied from a single feeder, and shunt tripping of elevators where the elevator equipment room and/or shaft has a fire suppression sprinkler system. In case of emergency, electricians, maintenance personnel and any elevator technicians called in to the premises should have ready access to the key. Each fused switch or circuit breaker in the panelboard is used as an elevator disconnect. Design practices that are acceptable in some jurisdictions may not be in others. It begins by considering metal and nonmetallic wireways. 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. ELECTRIC PASSENGER & FREIGHT ELEVATORS ASME A17.1 2004 Electric Elevator Checklist 2004 Multi-car.doc Page 4 of 44 Page Completed for cars : - Last Updated: 8/1/05 Car Enclosure Electric 2.14 - Hydraulic 3.14 A17.1 (A17.2) COMMENTS CARS 1-6 Operating Control Devices ADA Requirements Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ The fan should be on a dedicated circuit. This is somewhat broader than A17.1-2007/B44-07. These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. Any other utilization equipment associated with the elevator 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. You are seeing this message for one of three reasons: You have reached your limit of free content. Here, the National Electrical Safety Code has jurisdiction. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Hint: Duct Tape to the Rescue, NEC: Air Conditioning and Refrigerating Equipment Part 5. 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).
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