Pit drainage must be designed to eliminate a minimum capacity of 3,000 gallons per hour (or 50 GPM) per elevator car. Electricity is often one of the initial services to fail during a storm. above the pit floor, shall: Be weatherproof (NEMA 4). In this case, it may be best if the elevator controller manufacturer does not include the elevator disconnecting means (often offered as a circuit breaker) but instead have the installer provide a separate fused disconnect to comply with NEC 620.51(A) and also achieve a high SCCR for the elevator controller when fuses are provided as specified by the elevator controller and marked on the elevator controller nameplate. The light switch for the equipment room must be adjacent to the entrance door on the latch side. And so the needs can be very different. This is especially true in an elevator shaft where measures have to be taken to ensure that a hazardous situation is not created. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. 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. 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. It is stated that traveling cables are to be suspended at the car and hoistway ends, or counterweight end where applicable, so as to reduce the strain on the individual copper conductors to a minimum. The party responsible for procuring the elevator control panel must state the minimum acceptable SCCR or the maximum available fault current where the controller will be installed. 0 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. 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. Notice the definition mentions the full range of operating times. The lighting switch shall be located so as to be readily accessible from the pit access door. Shi Liguang, Yao Lianghong, Luo Zhiqun and Wan Jianru, Constructional Stretch and Hoist-Rope Tension . NEC specifies Hoistway wiring, and doesn't seem to distinguish between hoistway and pit. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. It is further stipulated that internal voltages of power-conversion equipment and functionally associated equipment, and the operating voltages of wiring interconnecting the equipment, are permitted to be higher, provided that the equipment and wiring are listed for the higher voltages. ASME A17.1 . These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. Motor controllers are permitted outside the spaces specified above. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. %%EOF The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. 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. Here are 23 ways that both chapters and the national office can meet todays major challenge of making members feel valued, IAEIs Online Training allows you to learn at your own pace or live with an expert instructor, from the comfort of your laptop or PC. My reasoning comes from 620.24 (A) and (C). All rights reserved. When the elevator car is at the top landing, it is the length of cable as measured from the point of suspension on the car to the bottom of the loop. 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. You can email the site owner to let them know you were blocked. Cross-sectional areas of conduits are given in Chapter 9, Table 4. Hydraulic elevators are typically more cost effective and used for buildings up to 5-6 stories. Lights and convenience outlets in elevator pits shall be installed to comply with the requirements of CCR, Title 24, Part 3, Article 620. !>x=yy Bvv8?~e PK ! Dont troubleshoot unless you can keep your shoe/boot soles dry. An exception provides that liquid-tight flexible metal conduit or liquid-tight flexible nonmetallic conduit 3/8 in. However, when I've put in elevators, NEC seems to always take a back seat to ANSI, which seems . 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. 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. Firefighters can then use portable telephone handsets in combination with the jacks and cabling. 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. Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. 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? Mobile, AL 36606 USA Flexible cords and cables, or conductors grouped together and taped or corded, are permitted to be installed without a raceway. The traveling cable, of necessity, is exempted. Something went wrong. 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. Generally, it is decreed that the supply voltage is not to exceed 300 V between conductors (allowing for the familiar 240-V concept), although there are exceptions. A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. 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. 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. (e) Pit Maintenance. Even non-composite fiber-optic cable, which does not carry electrical energy, is subject to the code. GET YOUR CEUS TODAY, 1998-2021. These requirements, found in Article 620 (part of Chapter 6, Special Equipment), are in addition to NEC Chapters 1-3, which stipulate general wiring protocols applicable in most residential, commercial and industrial venues. (A) Separate Branch Circuit. For instance, a typical elevator controller may traditionally have SCCR ratings from 5 to 10 kA. (B) Lighting Switch. A separate branch circuit shall supply the hoistway pit lighting and receptacle (s). NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. David Herres You are a subscriber that needs to Sign In. 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 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. [emailprotected] Guarding: Where possible, install temporary guarding to protect from inadvertent contact. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. 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. 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. 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. In elevators provided with Firefighters' Emergency Operation, a drain or sump pump shall be provided. But by understanding how these items fit together and what purpose they serve, you can have a successful project. 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. 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. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. +;-mka|7! The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. Hoistway door interlock wiring from the riser must be flame retardant and have insulation suitable for a temperature not less than 200C (392F), much higher than that required for most raceway or cable applications. Many new buildings are incorporating an elevator design that does not include an equipment room (sometimes called machine room-less elevators). 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. (Cross-sectional areas of conductors are given in Chapter 9, Tables 5 through 8. Though I understand how someone might argue two. Follow the manufacturers instructions and precautions. . 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.
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