nec elevator pit requirements
It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. ASME A17.1 . Firefighters can then use portable telephone handsets in combination with the jacks and cabling. or larger, not over 6 ft. in length. The idea is quite simple. All Rights Reserved | Contact Us | Privacy Policy. Part IX, Grounding, states that metal raceways, Type MC cable, Type MI cable or Type AC cable attached to elevator cars are to be bonded to metal parts of the car bonded to the equipment grounding conductor. Flexible cords and cables that are components of listed equipment and used in circuits operating at 30 V (42 VDC) or less are permitted in lengths not to exceed 6 ft., provided the cords and cables are supported and protected from physical damage and are of a jacketed and flame-retardant type. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. PK ! Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. 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 two documents are in harmony and should be used in conjunction. Per the 2017 NEC, if the elevator is designated as an emergency system load, the disconnect must be protected by a surge protective device (SPD). f?3-]T2j),l0/%b You must locate this key switch at the main lobby or at the building fire command center. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. [emailprotected] These may include: The author would like to recognize Jonathan Kennedy for his assistance in creating this article. For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. C.1.4 ELEVATOR PIT REQUIREMENTS 1. Here, the National Electrical Safety Code has jurisdiction. 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? Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. High-rise buildings pose additional concerns. 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. The panel further clarified that the marked SCCR value must be adequate for the available fault current to ensure a safe installation. 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. The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. After reading this article, you should have learned about: The meanings of definitions for control room and control space versus machine room The purpose and specifications for working spaces Insulation types and minimum sizes of conductors Requirements for feeder and branch-circuit conductors Feeder demand factors for ele-vators. This is not the elevator companys responsibility. 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. As such, elevator controller manufacturers should make the effort to rethink their designs to avoid costly system design changes. We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. The electrical system designer needs to communicate this information to the person responsible for specifying the elevator controller, which is most often the architect. Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. The AHJ is saying that this is a violation of 620.23. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. Special conditions: Troubleshooting in wet, hot or cold conditions calls for extra caution. 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. z, /|f\Z?6!Y_o]A PK ! Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. 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. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. 354 Morgan Ave. Machine room/control space lighting and receptacles 4. The cover shall be secured and level with the pit floor. 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. These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. I've never run into this before. Supports for cables or raceways in a hoistway or in an escalator or moving-walk wellway or platform lift and stairway chairlift runway must be securely fastened to the guide rail, escalator or moving-walk truss, or to the hoistway, wellway or runway construction. Cylinders in hydraulic elevators usually aren't suitable for buildings taller than five stories. 988 0 obj <>stream 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. All Rights Reserved | Contact Us | Privacy Policy. Traditional wiring methods and materials come into play, as always, but it is necessary to rethink their deployment. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. We have circuited the receptacles and lights in the pits to the same circuit. hbbd```b``+3dL `Y[gw9`RLJO*A$w$@L`F*{|0 P 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. +;-mka|7! GFI Receptacles: GFI receptacles shall be required in all elevator machine rooms, machinery spaces and elevator pit areas. 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. Have wiring identified for use in wet locations in accordance with the requirements in NFPA 70. Additionally, duty on elevator and dumbwaiter motors is rated as intermittent, whereas duty on escalator and moving-walk motors is considered continuous. 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. (e) Pit Maintenance. They are to be part of listed equipment, a driving machine or a driving-machine brake. Pit light with guard (ten foot candles min. 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. 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. The basic wiring methods are rigid-metal, rigid nonmetallic or intermediate-metal conduit; electrical metallic or rigid nonmetallic tubing; wireways; or Type MC, MI or AC cable, unless otherwise permitted. above the pit floor, shall: Be weatherproof (NEMA 4). Elevator motors are inherently intermittent duty. For example, it is stated that the cross-sectional area of the individual conductors in a wireway are not to exceed 50% of the interior cross-sectional area of the wireway. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. 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. 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. Cloudflare Ray ID: 7a2fbe9ebd7e2fe8 Each of these performs a different function, and the wiring mandates vary accordingly. A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. The code notes that elevator rails or other hoistway equipment are not to be used as the grounding conductor for lightning-protection systems. However, this can vary depending on building conditions and exterior grade. Traction elevators are typically installed in a bank of elevators where fused switches, or circuit breakers in a panelboard are located in the machine room serving the bank of elevators. 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. The feeder OCPD needs to remain closed so the remaining elevators have power and continue to function. With the new elevator controller requirements, more attention will be focused on the elevator system. Always verify all conditions and requirements with the state and the AHJ where the installation is taking place. Such cable groups are to be supported at intervals not over 3 ft. and located so as to be protected from physical damage. IAEI News Magazine. This position paper is written to provide guidance to members whose employees are engaged in elevator-industry work that might expose them to arc-flash hazards, and to assist members in complying with applicable OSHA and National Fire Protection Association (NFPA) standards.