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It is further stated that the disconnecting means are not to disconnect the branch circuits required in sections 620.22, 620.23 and 620.24. Your IP: Where the elevator shaft and/or equipment room has a sprinkler fire suppression system installed, the elevator Code requires main line power to the elevator be removed prior to the application of water. Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. 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. The two documents are in harmony and should be used in conjunction. My reasoning comes from 620.24 (A) and (C). Sign up for our free e-newsletter. 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. 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? NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc 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. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. You are a subscriber that needs to Sign In. Both electric and nonelectric elevators are to comply with Article 250, the code article that covers grounding and bonding in general. Always verify all conditions and requirements with the state and the AHJ where the installation is taking place. 3016. Pits for Elevators. - California Department of Industrial Relations Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. Corporate Office The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. The lighting switch shall be located so as to be readily accessible from the pit access door. PK ! 988 0 obj <>stream . Part VII, Overcurrent Protection, divides this topic into four categories for elevators and similar equipment, depending upon the nature of the specific equipment: For operating devices and control and signaling circuits, protection against overcurrent is in accordance with the requirements of Sections 725.43 and 725.45. If you specify a rescuvator, you must also specify a disconnect switch with an auxiliary contact that opens when the disconnect arm moves to the open position, but stays closed when the OCPD trips. Other requirements: Spa's and Hot Tubs 1996 NEC 15-20 Amp 120 volt Receptacle Requirements for Dwelling units: All outdoor 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. f?3-]T2j),l0/%b Electricity is often one of the initial services to fail during a storm. NEC Article 0: Elevator art by David Herres Continued. Each of these performs a different function, and the wiring mandates vary accordingly. 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. 2. NEC Article 620: Elevators, Part 2 - Elevator World, Inc. PDF NEC Article 0: Elevator art First, you'll need to install lighting in the elevator equipment room (Photo 1) and shaft pit (Photo 2). 354 Morgan Ave. The same figure applies to nonmetallic wireways. Loss of voltage to the control circuit for the disconnecting means shall cause a supervisory signal to be indicated at the control unit and required remote annunciation. With the elevator car at the bottom landing, it is the length of cable as measured from the point of suspension in the hoistway to the bottom of the loop. U.S. Latham, NY Shopping Miscellaneous Retail Stores, NEC Wheelchair lifts EazyLift Elevators, . Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. However, this can vary depending on building conditions and exterior grade. 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. Car air-conditioning and heating units 3. Requirements for commercial garages per the National Electrical Code. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. Elevator Pit Sump Pump Electrical Requirements As such, elevator controller manufacturers should make the effort to rethink their designs to avoid costly system design changes. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. 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. Bonding of elevator rails to a lightning-protection system grounding conductor is permitted, but the conductor itself is not to be located in the hoistway. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. 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. These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. Traditionally, the electrical system design engineer has given little attention to the elevator controller. The conduit alone can't act as the grounding means. NEC 2011 Article 620.21(2)(b) states that hard-service cords and junior hard-service cords that conform to the requirements of Article 400 (Table 400.4) are permitted as flexible connections between the fixed wiring on the car and devices on the car doors or gates. And so the needs can be very different. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. You must locate this key switch at the main lobby or at the building fire command center. Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. All rights reserved. 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. 68 | WWW.ELEVATORWORLD.COM | June 2012 Continuing Education . Main feeders that supply elevator power must be kept outside the hoistway unless one of the following applies: Feeders for elevators are permitted within an existing hoistway (provided they are not spliced within the hoistway) by special permission of the AHJ. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. Section 620.43, Location of and Protection for Cables, provides that traveling cable supports are to be located so as to reduce the possibility of damage due to the cables coming in contact with the hoistway construction or equipment in the hoistway to a minimum. 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 your specifications require a vent at the top of the shaft for venting smoke, you must provide a key switch with a pilot light to control that vent. Adhering to the requirements will ensure a hazard-free electrical installation. 6 feet, and shall meet the requirements of NEC 70 620.21(A)(1)(d). Please check your entries and try again. In these installations, it is best to design the elevator controller so the elevator controller SCCR is adequate for the available fault current. NEC Guidelines on Commercial Garages | EC&M It begins by considering metal and nonmetallic wireways. Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. 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. 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. They are to be part of listed equipment, a driving machine or a driving-machine brake. For elevators with battery lowering systems, an additional contact must be supplied and wired to disable the battery lowering system when the elevator disconnect is manually operated for maintenance. See Section 3 of the. Design practices that are acceptable in some jurisdictions may not be in others. 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. It is further specified the machine-room lighting switch be located at the point of entry. Upon loss of power, the rescuvator controls the cab, lowers it to the designated floor, and opens its doors. First, the traveling cable must be composed of very fine-stranded conductors so it can flex with a minimum of internal stresses, ensuring long service life and reliability. You'll need to run telephone cables to the equipment room control panel, but the elevator supplier will take care of getting the cables to the elevator cab. They are permitted to be run without raceway when used inside the hoistway, on the elevator car, hoistway wall, counterweight, or controllers and machinery located inside the hoistway, provided they are in their original sheaths. In a time when increasing value is placed on even small amounts of real estate, elevator design must strive to configure, efficiently control and drive elements to whatever degree possible, and that is the thinking behind some alternate locations for these structures. You may go up to 600 V for power circuits supplying door-operator controllers and door motors, branch circuits and feeders to motor controllers, driving-machine motors, machine brakes and motor-generator sets. Metal grating shall be installed over the hole that sits flush with the pit floor. The demand factors are given in Table 620.14, which allows significant reductions as the number of motors is increased. Additional branch circuits are to supply other utilization equipment not covered above. Hoistway pit lighting and receptacles 5. Selective coordination is also required for multiple elevators per NEC 620.62. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. (To design and install an elevator for a Class I, Division 1 location would be quite an undertaking.). Pit drainage must be designed to eliminate a minimum capacity of 3,000 gallons per hour (or 50 GPM) per elevator car. 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. 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.