(A) tells us that the lighting and receptacle (s) for the pit must be on separate circuits. The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. As stated in Section 7 of the Elevator Industry Field Employees Safety Handbook: Unless it is not feasible, (i.e. Use the below learning-reinforcement questions to study for the Continuing Education Assessment Exam available online at www.elevatorbooks.com or on page 81 of this issue. Which equipment requires a separate branch circuit in the elevator car? Is lighting required to be GFCI protected in the machine room? Where is the lighting switch to be located in the machine room? What is the maximum raceway conductor fill in an elevator hoistway? How many disconnecting means are required for an elevator power supply? 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 Upon loss of power, the rescuvator controls the cab, lowers it to the designated floor, and opens its doors. Car lighting, receptacles and ventilation 2. Part X, Emergency and Standby Power Systems, is simple and straightforward. 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 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. 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. Additionally, duty on elevator and dumbwaiter motors is rated as intermittent, whereas duty on escalator and moving-walk motors is considered continuous. High-rise buildings pose additional concerns. 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. No provision is to be made to automatically restore power. Both electric and nonelectric elevators are to comply with Article 250, the code article that covers grounding and bonding in general. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. Something went wrong. 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. In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. It does specify wiring methods allowed, though, in 620. ) > 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 Each fused switch or circuit breaker in the panelboard is used as an elevator disconnect. First, it is now clear that elevator controllers must be marked by the manufacturer with their SCCR. IAEI News Magazine. above the seal plate, adjacent to the ladder. All rights reserved. The most complex of these is the elevator. Cables used in Class 2 power-limited circuits are permitted between risers and signal equipment and operating devices, provided they are supported and protected from physical damage and are of the jacketed and flame-retardant type. As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. It is further specified the machine-room lighting switch be located at the point of entry. You'll be responsible for specifying the items related to the fire alarm and some controls, as well as supplying lighting and power to the equipment room and elevator pit. 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. The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. This is not the elevator companys responsibility. The action you just performed triggered the security solution. Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. You are seeing this message for one of three reasons: You have reached your limit of free content. Marking the available short-circuit (fault) current on the controller by the equipment installer. Pits shall be maintained in a clean and dry condition. 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. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. The elevator pit discharge system is not required to include an oil separator, except as required by section 1003.4. The Code provides guidance through regulations to establish requirements. Car air-conditioning and heating units 3. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location David Herres David Herres holds a New Hampshire Master Electrician's license and has worked as an electrician in the northern part of that state for many years. 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. Such design innovations require sophisticated wiring strategies. 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. 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. Additional requirements concern escape routes. 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. 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. But, building codes had been in existence for many centuries. In all cases, the working space must permit at least a 90 opening of equipment doors or hinged panels. (f) Illumination of Pits. 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. First, you'll need to install lighting in the elevator equipment room (Photo 1) and shaft pit (Photo 2). The disconnecting means is to be an externally enclosed, operable, fused motor circuit switch or circuit breaker capable of being locked in the open position. 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. 988 0 obj <>stream This lighting and receptacle circuit is separate from the circuit serving the motor. These conductors may be covered with suitable shielding for telephone, audio, video or higher-frequency communications circuits. 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). from components that are not otherwise guarded. 3. 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. A different occurrence involves exposure to the explosive blast when there is a line-to-line or line-to-ground arc blast. Metallic articles: Remove metallic articles such as watches, chains, bracelets, earrings, belt buckles and keychains before troubleshooting. Similarly, the integrity of the traveling cable is emphasized. Notwithstanding, if sprinklers are installed in hoistways, machine rooms or the like, the disconnecting means is permitted to automatically open the power supply to the affected elevator(s) prior to the application of water. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. 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. 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. While machine room-less designs have been commercially available for many years, their use may still be unknown to some AHJs. 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. (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. Corporate Office A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. My reasoning comes from 620.24 (A) and (C). Many professionals believe the NEC is applicable only for voltages over a certain level, but that is not the case. 4.0 (2 Reviews) (2) CLAIMED . A further requirement concerns elevator-car air-conditioning and heating. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. 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. 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. All elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. These selective coordination tables for current-limiting fuses show the minimum amp ratio required between a pair of fuses of a given type(s) to achieve selective coordination. Click to reveal 68 | WWW.ELEVATORWORLD.COM | June 2012 Continuing Education . The Uniform Building Code requires two-way communications between the central command center and the elevators, each elevator lobby, emergency power rooms, and by entries into enclosed stairways (Section 403.5.3). N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ 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. This accomplishes two functions. The new ADAAG guidelines now require that emergency power be available to elevators that have four or more stories of travel above or below the accessible floor [4.1.3(9)(1)]. 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. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. The fan should be on a dedicated circuit. 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. 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. Moreover, it is necessary to consider future worker safety for an indefinite period. In order to aid enforcement, the panel additionally required marking the available fault current at the elevator controller. For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. The light switch in the pit must be mounted 42 in. All Rights Reserved | Contact Us | Privacy Policy. 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. Other requirements: Spa's and Hot Tubs 1996 NEC 15-20 Amp 120 volt Receptacle Requirements for Dwelling units: All outdoor You can email the site owner to let them know you were blocked. Another important electrical system design consideration for supplying power to multiple elevators is NEC 620.62. A separate 120VAC, 15A circuit is required for cab lighting and accessories, and it must have its own local disconnect and OCPD in the equipment room as well. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. Similarly, underground wiring in mines is not NEC regulated, although other, non-mine wiring below ground (such as lighting in an underground traffic tunnel) is covered. For example, an inadequately supported ceiling fan could fall and cause injury or property damage. 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. ASME A17.1, Section 2.2.5, National Electrical Code, Rule 620-85 4. Elevators with driving machines located on the car or counterweight, or in the hoistway are permitted outside the specified spaces. Traveling cables are to be supported by one of these means: Looping the cables around supports for unsupported lengths less than 100 ft. Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. (A) Separate Branch Circuit. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. Many of these are for portable lighting.). An example would be the elevator, as well as all wiring in a utility-owned administration building. Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. Dont troubleshoot unless you can keep your shoe/boot soles dry. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. 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. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. Cloudflare Ray ID: 7a2fbe9ebd7e2fe8 Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. 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. 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. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. This website is using a security service to protect itself from online attacks. As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room.