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NEC Article 0: Elevator art by David Herres Continued. Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. This room is to be secured against unauthorized access (kept locked). With these new NEC requirements, there is now the potential that an elevator controller SCCR may be required thats higher than what elevator manufacturers have historically furnished. The lighting switch shall be located so as to be readily accessible from the pit access door. 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. Here, the National Electrical Safety Code has jurisdiction. The light switch in the pit must be mounted 42 in. This is the area within the hoistway beneath the car, and there are occasions when elevator technicians have to work in this area for maintenance and troubleshooting. 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. Requirements for commercial garages per the National Electrical Code. 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. The two documents are in harmony and should be used in conjunction. Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. 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. 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. 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. Such cable groups are to be supported at intervals not over 3 ft. and located so as to be protected from physical damage. You must locate this key switch at the main lobby or at the building fire command center. Sumps and sump pumps in pits, where provided, shall be covered. The fan should be on a dedicated circuit. In case of emergency, electricians, maintenance personnel and any elevator technicians called in to the premises should have ready access to the key. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. 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. Because they need to move and flex, traveling cables are not required to be in a raceway. NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) My reasoning comes from 620.24 (A) and (C). +1-251-479-4514 | [emailprotected], Trkiye Office Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. The NEC rule specifies that the minimum size for paralleled conductors is 1/0 AWG, which is much too big for an elevator traveling cable. In contrast to the lighting, these receptacles must be connected to GFCI devices. 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. +1-251-479-4514 | [emailprotected], Trkiye Office If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. 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. 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. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. The disconnecting means is also to be a listed device. 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. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. Through numerous editions, the NEC has, to a great extent, mitigated the hazards accompanying widespread use of electricity, particularly with respect to elevator technology. 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. above the seal plate, adjacent to the ladder. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. All rights reserved. (A) Separate Branch Circuit. Hard-service cords are permitted only as flexible connections for the top-of-car operating device or the car-top work light. Many NEC articles address voltage limitations, and Article 620 is no exception. The main impetus for the creation of the NEC in the closing years of the 19th century was the collective anguish experienced by insurance underwriters who were losing vast amounts of money due to liability and physical damage claims resulting from Edisons electrification of, first, Lower Manhattan and then the world. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. 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. Eazylift Albany LLC, 836 Troy Schenectady Rd, Latham, NY, Elevators You can email the site owner to let them know you were blocked. Please check your entries and try again. 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. The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. 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 sump pump/drain shall have the capacity to remove a minimum of 11.4 m. 3 /h (3,000 gal/h) per elevator. Finally, in 1897, the first National Electrical Code (NEC) appeared. Personal protective equipment (PPE): Use appropriate PPE to protect body parts within the range of 3-16 in. ), advise the building owner to correct the condition. Electricity is often one of the initial services to fail during a storm. And as the designer, you can become the fulcrum on which all of these requirements and authorities exert their leverage, but an understanding of elevator basics can help you handle the pressure. Requirements in Article 620 modify the articles in Chapter 3. For current-limiting fuses, the information to achieve selective coordination has been available for many years in fuse amp ratio tabular form. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. (C) Duplex Receptacle. A few years later, in 1880, Werner von Siemens built the first electric elevator, setting the stage for a new industry that would change the world by making the practical use of tall buildings possible. 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. 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. If a smoke detector goes into alarm, it signals the elevator to go into Fire Recall Function, at which point the controller directs the elevator cab to travel to its pre-programmed designated landing, open its doors, and remain stopped there until the alarm clears. 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. endstream endobj startxref By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. 6 feet, and shall meet the requirements of NEC 70 620.21(A)(1)(d). Elevator travel is far safer than an automobile trip, and the chance of experiencing disaster is on the order of being struck by lightning in ones own backyard. This lighting and receptacle circuit is separate from the circuit serving the motor. No provision is to be made to automatically restore power. We have circuited the receptacles and lights in the pits to the same circuit. Additional branch circuits are to supply other utilization equipment not covered above. These 29 CFR 1910.146 (c) (8) requirements are: A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. IAEI News Magazine. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. This will normally require you to vent the room with a fire/smoke damper and include smoke detector signals in the control logic. 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. This is not the elevator companys responsibility. The light switch shall be located so to be accessible from pit access door. !>x=yy Bvv8?~e PK ! Pit light with guard (ten foot candles min. 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) You are a subscriber that needs to Sign In. Click to reveal The article stands apart from the rest of the code in the sense it exempts these categories of circuits from the general requirements for wiring in most occupancies, found in Chapter 3. 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. Sign up for our free e-newsletter. As greater numbers of elevators are added, the likelihood of them all operating simultaneously decreases so that it is permissible to reduce the feeder ampacity. Cloudflare Ray ID: 7a2fbe9ebd7e2fe8 These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. 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. All elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. So, we see that for elevator work, greater fill is allowed.

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