NEC specifies Hoistway wiring, and doesn't seem to distinguish between hoistway and pit. This is somewhat broader than A17.1-2007/B44-07. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. Pit light with guard (ten foot candles min. 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. 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. If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. Pit drainage must be designed to eliminate a minimum capacity of 3,000 gallons per hour (or 50 GPM) per elevator car. For example, an inadequately supported ceiling fan could fall and cause injury or property damage. 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. 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. Many people use portable generators until power is restored. Examples of PPE that may be appropriate are non-conductive eye protection, clean leather or fire-resistant gloves, and natural-fiber or fire-resistant-rated long-sleeved shirts and pants, or fire-resistant-rated long-sleeved coveralls. 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 building has emergency power available, use it to supply the cab lights. In hoistways not longer than 6 ft., these additional wiring methods are permitted: A sump or oil-recovery pump located in the pit is permitted to be cord connected. GET YOUR CEUS TODAY, 1998-2021. A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. For instance, a typical elevator controller may traditionally have SCCR ratings from 5 to 10 kA. The light switch shall be located so to be accessible from pit access door. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. This is especially true in an elevator shaft where measures have to be taken to ensure that a hazardous situation is not created. Each fused switch or circuit breaker in the panelboard is used as an elevator disconnect. 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). 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. Hammurabi, sixth king of Babylon and creator of the Babylonian Empire, decreed: If a builder builds a house for someone and does not construct it properly, and the house which he built falls in and kills its owner, then that builder shall be put to death. We have circuited the receptacles and lights in the pits to the same circuit. 1. This will normally require you to vent the room with a fire/smoke damper and include smoke detector signals in the control logic. 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 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. (To design and install an elevator for a Class I, Division 1 location would be quite an undertaking.). In all cases, the working space must permit at least a 90 opening of equipment doors or hinged panels. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. You are a subscriber that needs to Sign In. Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. 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. Moreover, it is necessary to consider future worker safety for an indefinite period. 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. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. 0 Mike Holt. It is further specified the machine-room lighting switch be located at the point of entry. Next, with multiple elevator banks, the controller will usually allow only one elevator at a time to operate, reducing the amount of emergency power required. Here again, the lighting is not to be connected to a GFCI, whereas such protection is required for the receptacle(s). Hazards created by water, snow or condensation in the work area can cause slips, falls and accidental contact. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. Weight (passengers, freight, car and attendant machinery) may be fairly substantial, and speed is significant. 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. Luminaires must be lensed or equipped with wire guards to protect the lamps. Conductors supplying a single motor controller are to have an ampacity not less than the motor controller nameplate current rating plus all other connected loads. See Section 3 of the. %PDF-1.5 % As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. 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. 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. If your specifications require a vent at the top of the shaft for venting smoke, you must provide a key switch with a pilot light to control that vent. 6 Stop Switch in Pits There shall be installed in the pit of each elevator an ASME A17.1 CODE enclosed stop switch or switches meeting the requirements The following material is reprinted with permission from the American of 2.26.2.7 and 2.2.6.1 through 2.2.6.3. 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. For elevators that regenerate power back into a power source unable to absorb the regenerative power under overhauling elevator load conditions, a means to absorb this power is to be provided. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. 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. The many codes and guidelines that regulate the electrical design of an elevator can seem overwhelming, and dealing with the electrical inspector, elevator inspector, and Fire Marshal can be even more intimidating. Fluid pressure in the cylinder raises and lowers the elevator cab. +1-251-479-4514 | [emailprotected], Trkiye Office The same figure applies to nonmetallic wireways. After such an event, it is important that the affected worker is able to escape the area and get to help. Corporate Office Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators. Therefore, elevator equipment rooms must maintain a temperature between 50F and 90F. This may include wiring for signals, communication with the car, lighting, heating, air-conditioning and ventilation of the car or hoistway for fire-detecting systems and pit sump pumps. Your elevator supplier will take care of all the wiring and related code requirements for the elevator cab and the various controls. The fan should be on a dedicated circuit. This website is using a security service to protect itself from online attacks. The Code provides guidance through regulations to establish requirements. It is also worth mentioning that the stated purpose of the NEC is the practical safeguarding of persons and property from hazards arising from the use of electricity. It states an elevator is permitted to be run by an emergency or standby power system. 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. (A) tells us that the lighting and receptacle (s) for the pit must be on separate circuits. He also required GFCI protection for the hard-wired sump pump that did not require it. (g) Stop Switch in Pits. Part II of Article 620 concerns conductors used in elevator work, and several important requirements are covered. Many professionals believe the NEC is applicable only for voltages over a certain level, but that is not the case. Get more of Elevator World. The panel further clarified that the marked SCCR value must be adequate for the available fault current to ensure a safe installation. If we fast forward more than 36 centuries, we see some important new developments in elevator technology. 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. 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. +90 (216) 348 4876, India Office For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. Selective coordination is also required for multiple elevators per NEC 620.62. 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? of the sprinkler heads. 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. 354 Morgan Ave. above the pit floor, shall: Be weatherproof (NEMA 4). Machine room/control space lighting and receptacles 4. Lights and convenience outlets in elevator pits shall be installed to comply with the requirements of CCR, Title 24, Part 3, Article 620. The architect has a choice of either traction or hydraulic elevators. This may be countered by providing good machine-room ventilation. 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. A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. When you're designing an electrical system for a building, don't let elevator requirements bring you down. 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. The elevator equipment room that serves a hydraulic elevator is almost always located on the lowest floor adjacent to the elevator shaft. 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. Second, it must be configured so as to eliminate any chance of tangling or chafing against the inner surface of the hoistway or items mounted on it. Such cable groups are to be supported at intervals not over 3 ft. and located so as to be protected from physical damage. 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. 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. +91 8025357028, 2022 Elevator World, LLC. Overload protection for motors is to conform with Article 430, Part III, the general code area that covers motor and branch-circuit overload protection for all motors. 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. 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. 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. This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. 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. It is noted that the article covers the installation of electrical equipment and wiring for elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts. 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. Flexible cords and cables, or conductors grouped together and taped or corded, are permitted to be installed without a raceway. 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. With the new elevator controller requirements, more attention will be focused on the elevator system. This room is to be secured against unauthorized access (kept locked). 23.254.250.15 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. 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. 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. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc [emailprotected] So, we see that for elevator work, greater fill is allowed. The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. 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. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. Moreover, because motors have a higher starting current than other loads, the overcurrent protection protocol is unique to them and somewhat counterintuitive. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. !>x=yy Bvv8?~e PK ! Notice the definition mentions the full range of operating times. 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). 2m9 `K]f*F gaR Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing. 6 feet, and shall meet the requirements of NEC 70 620.21(A)(1)(d). NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. Where necessary, it is mandated that suitable guards be provided to protect the cables against damage. Another important electrical system design consideration for supplying power to multiple elevators is NEC 620.62. To avoid this situation, designers can specify elevator controls with a safety feature commonly called a rescuvator. 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. Within cars, these additional wiring methods are permitted: The following additional wiring methods are permitted on the car assembly in lengths not exceeding 6 ft.: Within machine rooms, these additional wiring methods are permitted: The following wiring methods are permitted on the counterweight assembly in lengths not to exceed 6 ft.: Having looked at NEC 2011 mandates for elevator and related equipment installations, we will cover wiring methods, overcurrent protection, grounding and other related NEC provisions in part two of this series , running in the April 2012 issue of ELEVATOR WORLD. This clear working space must be 30 in. The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. 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). (A) Separate Branch Circuit. 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. For circuit breakers, time-current curves must be consulted as well as the circuit breaker manufacturers selective coordination tables. Elevator Pit Sump Pump Electrical Requirements By Nat July 30, 2022 Bulls Eye (Simplex) Receptacles: Bulls eye (simplex) receptacle for Sump pumps (now not - GFI) on a delegated circuit will be required in all elevator pits for the elevator pit sump pump. 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. In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. 4.0 (2 Reviews) (2) CLAIMED . He is saying that each pit requires a separate circuit, in other words "dedicated". . You need to Subscribe to continuing reading. 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. Many NEC articles address voltage limitations, and Article 620 is no exception. As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. NFPA 72 requires the control circuit between the Fire Alarm System and the shunt trip be monitored for integrity. The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant.

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