It is further specified the machine-room lighting switch be located at the point of entry. You need at least one 120VAC GFCI-protected receptacle at each location. This is important as the tradition of using only time-current curves for the analysis of overcurrent device operation is usually not sufficient since the time-current curves traditionally stop at 0.01 second (not time zero). 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. 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. 2m9 `K]f*F gaR 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. PDF Compliance with the 2017 NEC for Elevator Controllers The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. 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. (g) Stop Switch in Pits. Hydraulic elevators are typically more cost effective and used for buildings up to 5-6 stories. In contrast to the lighting, these receptacles must be connected to GFCI devices. All of these options and special wiring can be challenging depending upon the location of the shunt trip circuit breaker as well as who has responsibility for providing these additional options. In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. It does specify wiring methods allowed, though, in 620. These may include: The author would like to recognize Jonathan Kennedy for his assistance in creating this article. Follow the manufacturers instructions and precautions. In order to aid enforcement, the panel additionally required marking the available fault current at the elevator controller. Such cable groups are to be supported at intervals not over 3 ft. and located so as to be protected from physical damage. The lighting switch shall be located so as to be readily accessible from the pit access door. Such design innovations require sophisticated wiring strategies. Please check your entries and try again. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. 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). This switch will ensure that the elevator won't descend into the elevator pit and allow maintenance people to work safely in the area beneath the cab. Get more of Elevator World. It is conditionally provided that fiber-optic cables and conductors for operating devices, operation and motion control, power, signaling, fire alarm, lighting, heating and air-conditioning circuits of 600 V or less are permitted to be run in the same traveling cable or raceway system. So, we see that for elevator work, greater fill is allowed. Part VIII, Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces, states elevator and similar-installation driving machines, motor-generator sets, motor controllers and disconnecting means are to be installed in a room or space set aside for that purpose. [emailprotected] Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. %%EOF Moreover, because motors have a higher starting current than other loads, the overcurrent protection protocol is unique to them and somewhat counterintuitive. Heating and air-conditioning equipment located on the car must not be in excess of 600 V. All live parts of electrical apparatuses are to be enclosed to protect workers and the public against accidental contact. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. All Rights Reserved | Contact Us | Privacy Policy. 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. 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. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. 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. 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. 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. 3. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. 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. He also required GFCI protection for the hard-wired sump pump that did not require it. Such vehicles include, but are not . Both electric and nonelectric elevators are to comply with Article 250, the code article that covers grounding and bonding in general. The demand factors are given in Table 620.14, which allows significant reductions as the number of motors is increased. Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. 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. 3016. Pits for Elevators. - California Department of Industrial Relations Other requirements: Spa's and Hot Tubs 1996 NEC 15-20 Amp 120 volt Receptacle Requirements for Dwelling units: All outdoor Elisha Otis safety elevator, introduced in 1853, prevented the fall of the car if the cable broke. 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. 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. You are a subscriber that needs to Sign In. The AHJ is saying that this is a violation of 620.23. The action you just performed triggered the security solution. A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. They are differentiated from other similar structures by the fact that they are not attached to the outside perimeter or surface of the walls, ceiling or floor of the hoistway. Performance & security by Cloudflare. In order to comply, the electrical system designer must determine the maximum available fault current at the elevator disconnecting means and assure the elevator disconnecting means overcurrent protective device will clear any overcurrent condition, up to the maximum available fault current, before any upstream overcurrent devices will operate. 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. 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. GET YOUR CEUS TODAY, 1998-2021. Any other utilization equipment associated with the elevator Motor feeder short circuit and ground-fault protection must be as required in Article 430, Part V for all motors. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. endstream endobj 954 0 obj <. 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. h-`7 It is important for design engineers to communicate this with the architect and owner during the design phase, as it will impact space needs elsewhere in the facility to accommodate electrical equipment. (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. 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. See Section 3 of the. 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? C.1.4 ELEVATOR PIT REQUIREMENTS 1. Please check your entries and try again. If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. 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. Dont troubleshoot unless you can keep your shoe/boot soles dry. 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. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. Many of these are for portable lighting.). Freight Elevator Door Control: An Opportunity for Wireless Technology. 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. 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. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. Each of these performs a different function, and the wiring mandates vary accordingly. 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). 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. 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. Your IP: 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. 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. But the lights don't have to be in the pit itself. 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. However, this can vary depending on building conditions and exterior grade. employees shall not perform any work on equipment where there is a potential to come in contact with energized mechanical or electrical hazards until all sources of energy have been de-energized, grounded or guarded.. In case of emergency, electricians, maintenance personnel and any elevator technicians called in to the premises should have ready access to the key. above the seal plate, adjacent to the ladder. The basic idea is that there must be a separate, dedicated circuit for car lights, receptacles and ventilation on each car. But by understanding how these items fit together and what purpose they serve, you can have a successful project. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. Many people use portable generators until power is restored. 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. 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. 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. 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. For current-limiting fuses, the information to achieve selective coordination has been available for many years in fuse amp ratio tabular form. The cover shall be secured and level with the pit floor. 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. 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. hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] 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. Guarding: Where possible, install temporary guarding to protect from inadvertent contact. Depending on your local codes, you can do this by installing heat or smoke detectors within 24 in. GFCIs in elevator pits During an inspection of the elevators in a commercial building, the state inspector failed us for using a GFCI-type circuit breaker to protect a receptacle in the elevator pit. Mobile, AL 36606 USA 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. In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. You must locate this key switch at the main lobby or at the building fire command center. 2. Utility-owned electrical structures not directly concerned with electrical generation, transmission and distribution are NEC regulated. The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. 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 Hydraulic elevator pit | Electrician Talk Conductors supplying more than one motor, motor controller or power transformer are to have an ampacity not less than the sum of the nameplate current ratings of the equipment plus all other connected loads. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. Below is a summary of these new 2017 NEC sections: In order to comply with these requirements a chain of events must occur. Machine room/control space lighting and receptacles 4. The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. . proved for elevator locations - car, hoistway, pit and a-chine roo equireents in Article odify the articles in Chap - ter For eaple, it is stated that the cross-sectional area 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. 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. As always, the best advice in all instancesdo your homework, communicate often, and document decisions made. 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). ), a duplex 15A 120-volt receptacle in pit with ground- fault circuit protection and a 15A 120-volt Non GFCI receptacle for the sump pump. This is because the material may contribute fuel to a fire that has originated elsewhere. The floor specified as the designated landing, which must be approved by the Fire Marshal, is usually the floor on grade level so passengers can quickly exit to the outside. 836 Troy Schenectady Road ; Latham, NY 12110 . Three wiring categories within hoistways are allowed in addition, each with exceptions. ) > 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 or larger, not over 6 ft. in length. 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)]. Therefore, elevator equipment rooms must maintain a temperature between 50F and 90F. As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. The light switch for the equipment room must be adjacent to the entrance door on the latch side. Selective coordination is also required for multiple elevators per NEC 620.62. If it kills the son of the owner, the son of that builder shall be put to death..
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