This may be countered by providing good machine-room ventilation. 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. This is something that can be easily accomplished if the elevator controller manufacturer uses components in combination with overcurrent protective devices that are tested and listed with high combination SCCRs. . NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. (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. You need at least one 120VAC GFCI-protected receptacle at each location. One. 836 Troy Schenectady Road Latham, NY 12110 . The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. Any other utilization equipment associated with the elevator Every building is different. 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. 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. 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. It is also worth mentioning that the stated purpose of the NEC is the practical safeguarding of persons and property from hazards arising from the use of electricity. Provide continuous, non -slip, horizontal rungs every 12" for the full height of the pit ladder. 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. 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. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. It is noted that the article covers the installation of electrical equipment and wiring for elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts. 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. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. It need not be exactly centered on the equipment, and working spaces of adjacent pieces of equipment may overlap. 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. 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. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. Other building loads, such as power and lighting, may function as the energy absorbing means, provided these loads are automatically connected to the emergency or standby power system operating the elevators and large enough to absorb the regenerative power. Where necessary, it is mandated that suitable guards be provided to protect the cables against damage. The proposals resulted in adding new requirements in the 2017 NEC for: Marking the elevator controller short-circuit current rating (SCCR) by the elevator control-ler manufacturer. The proposals resulted in adding new requirements in the 2017 NEC for: This article will also discuss other Code requirements that include selective coordination for elevators that are supplied by emergency, legally required standby or critical operation power systems or multiple elevators supplied from a single feeder, and shunt tripping of elevators where the elevator equipment room and/or shaft has a fire suppression sprinkler system. Thus, the traveling cable must be supported by a steel supporting member. 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. tC|[S9G?+uJP>&/TOy o PK ! It is important to note, that these selective coordination tables can indicate a lack of selective coordination at a given fault current for circuit breakers that do not show overlap on the time-current curves of the circuit breakers. NEC Article 0: Elevator art by David Herres Continued. First, it is now clear that elevator controllers must be marked by the manufacturer with their SCCR. Traveling cables are to be approved for hazardous locations and must comply with the appropriate sections for each hazardous-location class that covers use of flexible cords. But the lights don't have to be in the pit itself. z!0: - [Content_Types].xml ( n0EUb*>-RxV=QUAl"93dFk%Y?l}MGDV On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. The hazards are external to the equipment enclosure since equipment SCCR testing and evaluation criteria for product standards are most often performed with the enclosure doors closed and latched, and the fault occurring external to the enclosure. For platform lifts and stairway chairlifts, the duty is intermittent. 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. Please check your entries and try again. Next, with multiple elevator banks, the controller will usually allow only one elevator at a time to operate, reducing the amount of emergency power required. Electricity is often one of the initial services to fail during a storm. 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. 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. 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. 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. You are a subscriber that needs to Sign In. 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. All equipment in a machine room-less design is installed within the elevator shaft or exterior compartment near the elevator shaft, including the elevator controller and the elevator disconnecting means. 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 The two documents are in harmony and should be used in conjunction. from components that are not otherwise guarded. 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. APPENDIX A 2.2. The basic idea is that there must be a separate, dedicated circuit for car lights, receptacles and ventilation on each car. 4.0 (2 Reviews) (2) CLAIMED . 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. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. 988 0 obj <>stream For all of this to come together in the real world, there had to be some assurance that these new technologies could be used safely on a wide scale. 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. Pit drainage must be designed to eliminate a minimum capacity of 3,000 gallons per hour (or 50 GPM) per elevator car. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. ) > 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 The pump sends hydraulic fluid from the reservoir to the cylinder, buried deep below the elevator shaft. Many people use portable generators until power is restored. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. 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. Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. Firefighters can then use portable telephone handsets in combination with the jacks and cabling. (e) Pit Maintenance. The disconnecting means is also to be a listed device. Modern electronic elevator controls can be sensitive to temperature shifts. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. ), advise the building owner to correct the condition. If it kills the son of the owner, the son of that builder shall be put to death.. Part II of Article 620 concerns conductors used in elevator work, and several important requirements are covered. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. If the building has emergency power available, use it to supply the cab lights. 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. To avoid this situation, designers can specify elevator controls with a safety feature commonly called a rescuvator. Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. 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. It is important for the design engineer to coordinate with the architect to determine the elevator manufacturer basis of design to determine if and when additional power and lighting is required. An exception provides that liquid-tight flexible metal conduit or liquid-tight flexible nonmetallic conduit 3/8 in. 2. Pits shall be maintained in a clean and dry condition. !>x=yy Bvv8?~e PK ! Lights and convenience outlets in elevator pits shall be installed to comply with the requirements of CCR, Title 24, Part 3, Article 620. Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. 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. U.S. Latham, NY Shopping Miscellaneous Retail Stores, NEC Wheelchair lifts EazyLift Elevators, . ASME A17.1 . For current-limiting fuses, the information to achieve selective coordination has been available for many years in fuse amp ratio tabular form. If this is not done and the available fault current exceeds the elevator controller SCCR, other solutions to reduce fault current must be reviewed or equipment changes and field evaluations may be needed. 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. 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. 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. Additionally, duty on elevator and dumbwaiter motors is rated as intermittent, whereas duty on escalator and moving-walk motors is considered continuous. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. But by understanding how these items fit together and what purpose they serve, you can have a successful project. EazyLift Elevators, Stairlifts, Wheelchair Lifts & Ramps. Traditional wiring methods and materials come into play, as always, but it is necessary to rethink their deployment. 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. z, /|f\Z?6!Y_o]A PK ! Utility-owned electrical structures not directly concerned with electrical generation, transmission and distribution are NEC regulated. 2m9 `K]f*F gaR As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. from the exposed components, and the incident energy calculated at 18 in. After such an event, it is important that the affected worker is able to escape the area and get to help. The two main types of elevators are hydraulic and traction. An example would be the elevator, as well as all wiring in a utility-owned administration building. To address this issue, Code Making Panel (CMP) 12 of the National Electrical Code acted on several proposed changes to Article 620 during the revision cycle for the 2017 NEC that deal with the proper installation of elevator controllers. 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. It begins by considering metal and nonmetallic wireways. Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators.