Notwithstanding, if sprinklers are installed in hoistways, machine rooms or the like, the disconnecting means is permitted to automatically open the power supply to the affected elevator(s) prior to the application of water. Many NEC articles address voltage limitations, and Article 620 is no exception. Though I understand how someone might argue two. We shall now take a look at the principle requirements of Article 620, with particular emphasis on wiring requirements for elevator shafts, machine rooms and cars. above the pit floor, shall: Be weatherproof (NEMA 4). Because of this, several manufacturers offer an all-in-one shunt trip elevator disconnect switch that includes all the prewired accessories needed to comply with the various Code sections. z!0: - [Content_Types].xml ( n0EUb*>-RxV=QUAl"93dFk%Y?l}MGDV 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. This is important as the tradition of using only time-current curves for the analysis of overcurrent device operation is usually not sufficient since the time-current curves traditionally stop at 0.01 second (not time zero). Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. Frequently Encountered Items That Delay Accep Tance of New Elevators We have circuited the receptacles and lights in the pits to the same circuit. 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. For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ This is especially true in an elevator shaft where measures have to be taken to ensure that a hazardous situation is not created. Machine room/control space lighting and receptacles 4. As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). Section 620.37 re-emphasizes that only wiring used in connection with the elevator is permitted within the hoistway, machine room, control room/machinery space or control space. The condition is that all conductors must be insulated for the maximum voltage applied to any conductor within the cables or raceway system, and all live parts of the equipment must be insulated from ground for this maximum voltage. This room is to be secured against unauthorized access (kept locked). EazyLift Elevators, Stairlifts, Wheelchair Lifts & Ramps. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. Upon loss of power, the rescuvator controls the cab, lowers it to the designated floor, and opens its doors. endstream endobj 954 0 obj <. The lighting switch shall be located so as to be readily accessible from the pit access door. NEC specifies Hoistway wiring, and doesn't seem to distinguish between hoistway and pit. The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. All Rights Reserved | Contact Us | Privacy Policy. (f) Illumination of Pits. Many new buildings are incorporating an elevator design that does not include an equipment room (sometimes called machine room-less elevators). hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] Thus, the need for door interlock functionality is recognized. Elevator Pit FC Requirements CE017 - 1 - AppendicesABC - Code Elevator Pit Requirements | Mike Holt's Forum Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. 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. Smoke detectors, which are required in all elevator lobbies and elevator equipment rooms, must be connected to the elevator controllers directly by means of auxiliary contacts and wiring, or indirectly by means of output signals from the fire alarm control panel. It is worth noting that these NEC terms, used throughout Article 620, have been chosen to correlate with A17.1-2007 usage. Elevator cab lights require emergency back-up power. The Code provides guidance through regulations to establish requirements. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. Society of Mechanical Engineers. Because they need to move and flex, traveling cables are not required to be in a raceway. And so the needs can be very different. These 29 CFR 1910.146 (c) (8) requirements are: Other codes and standards interact with the NEC, and it is necessary to see how they all work together in order to create safe and compliant elevator designs/installations. Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. Utility-owned electrical structures not directly concerned with electrical generation, transmission and distribution are NEC regulated. Freight Elevator Door Control: An Opportunity for Wireless Technology. 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. 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. 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. 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. 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. However, when I've put in elevators, NEC seems to always take a back seat to ANSI, which seems . 2.2.2.6 . The disconnecting means is to be located adjacent to or an integral part of the motor controller. PDF Elevator Acceptance Inspections - Tennessee If the building has emergency power available, use it to supply the cab lights. Each of these performs a different function, and the wiring mandates vary accordingly. A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. While machine room-less designs have been commercially available for many years, their use may still be unknown to some AHJs. This is because the material may contribute fuel to a fire that has originated elsewhere. After such an event, it is important that the affected worker is able to escape the area and get to help. You must run a separate insulated grounding conductor with the feeder conductors from the electrical source to the elevator controller. In many cases, the overcurrent protective devices that are suitable for this level of protection are current-limiting fuses rather than a traditional circuit breaker. Where necessary, it is mandated that suitable guards be provided to protect the cables against damage. They must be in enclosures with doors or removable panels that can be locked in the closed position. Also located in this room might be, but not limited to: exhaust fan, cooling unit (depending on local requirements and/or requirements set forth by the individual elevator supplier), lighting, voice and/or data drop serving the elevator cab emergency phone, elevator controller primary fused disconnect, elevator feeder shunt-trip circuit (i.e., shunt-trip circuit breaker), elevator cab lighting fused switch, and convenience receptacle(s). Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. charlie b. Marking the available short-circuit (fault) current on the controller by the equipment installer. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. (To design and install an elevator for a Class I, Division 1 location would be quite an undertaking.). These are the principle NEC 2011 Article 620 mandates. PK ! Instruments: Use category III multimeters and be familiar with their use and limitations. 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. 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. Finally, typical installations and compliance with all these requirements will be discussed. The traveling cable, of necessity, is exempted. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. The disconnecting means is to be an externally enclosed, operable, fused motor circuit switch or circuit breaker capable of being locked in the open position. Granle is a licensed professional engineer with Sebesta Blomberg & Associates, Rochester, Minn. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/, ABCs Construction Backlog Indicator Down to Start 2023, The Most Popular Code Quizzes of the Week from 2021, The 10 Most Popular Photo Galleries of 2021, Whats Wrong Here? 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. If the entire feeder/branch circuit assembly were to be protected in the conventional manner, the motor would cut out long before reaching operating speed. Marking the elevator controller short-circuit current rating (SCCR) by the elevator controller manufacturer. Below is a summary of these new 2017 NEC sections: In order to comply with these requirements a chain of events must occur. Follow the manufacturers instructions and precautions. Cross-sectional areas of wireways are found by multiplying the two interior dimensions.) It is mandatory, as in the car, that these items have a separate, dedicated branch circuit, and the required lighting is not to be supplied through a GFCI. Mobile, AL 36606 USA 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. This clear working space must be 30 in. Reinforcing NEC 110.3(B) and NEC 110.10 to require the elevator controller marked SCCR to be equal to or greater than the calculated and If you can illuminate the pit using lights that are "above the top of the pit" (whatever that . These are covered for generic, non-elevator specific use in earlier articles, 376 and 378, in Chapter 3, Wiring Methods and Materials. 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. 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. GFI Receptacles: GFI receptacles shall be required in all elevator machine rooms, machinery spaces and elevator pit areas. Where voltages exceed 600, a sign reading DANGER HIGH VOLTAGE is required. Finally, in 1897, the first National Electrical Code (NEC) appeared. from the exposed components, and the incident energy calculated at 18 in. It states an elevator is permitted to be run by an emergency or standby power system. 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. Suspending the cables from the supports by a means that automatically tightens around the cable when tension is increased for unsupported lengths up to 200 ft. An NEC Informational Note defines unsupported lengths. Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators. Car air-conditioning and heating units 3. . The idea is quite simple. 974 0 obj <>/Filter/FlateDecode/ID[<64E135C225F1064D91BC8119D14516A9>]/Index[953 36]/Info 952 0 R/Length 105/Prev 204101/Root 954 0 R/Size 989/Type/XRef/W[1 3 1]>>stream Feeder and branch-circuit conductors are required to have specified ampacities: Feeder conductors of less ampacity are permitted for group installations and quite common in elevator work. A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. Both electric and nonelectric elevators are to comply with Article 250, the code article that covers grounding and bonding in general. 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. 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. (e) Pit Maintenance. David Herres The Uniform Building Code requires two-way communications between the central command center and the elevators, each elevator lobby, emergency power rooms, and by entries into enclosed stairways (Section 403.5.3). A further requirement concerns elevator-car air-conditioning and heating. The two main types of elevators are hydraulic and traction. Hazards created by water, snow or condensation in the work area can cause slips, falls and accidental contact. 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. Eazylift Albany LLC, 836 Troy Schenectady Rd, Latham, NY, Elevators Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. Inspecting Elevator Power Wiring - IAEI Magazine NFPA 72 requires the control circuit between the Fire Alarm System and the shunt trip be monitored for integrity. 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) It does specify wiring methods allowed, though, in 620. A raceway that comes loose on the inside of a hoistway could catch on a moving car, causing immense damage and hazard to users. You are seeing this message for one of three reasons: You have reached your limit of free content. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. They are to be located so as to be protected from physical damage, are to be of a flame-retardant type, and must be part of listed equipment, a driving machine or a driving-machine brake. Second, it must be configured so as to eliminate any chance of tangling or chafing against the inner surface of the hoistway or items mounted on it. This is typically accomplished via a shunt trip device. PDF Compliance with the 2017 NEC for Elevator Controllers The next section, 620.36, concerns different systems in one raceway or traveling cable. 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. This, however, can result in a dramatic increase in cost, space availability (lack thereof), and reduced efficiency. The electrical system designer calculates the maximum available fault current at the elevator controller. +90 (216) 348 4876, India Office For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. The cover shall be secured and level with the pit floor. In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation. Similarly, the integrity of the traveling cable is emphasized. 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 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. The pump sends hydraulic fluid from the reservoir to the cylinder, buried deep below the elevator shaft. In driving through commercialized suburban areas, you frequently see paralleled conductors for large retail grocers (where there is a heavy refrigeration load). Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. 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. NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) Another important electrical system design consideration for supplying power to multiple elevators is NEC 620.62. 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 elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. In case of emergency, electricians, maintenance personnel and any elevator technicians called in to the premises should have ready access to the key. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). employees shall not perform any work on equipment where there is a potential to come in contact with energized mechanical or electrical hazards until all sources of energy have been de-energized, grounded or guarded.. The traveling cable, moreover, may be run without raceway from inside the hoistway to elevator-controller enclosures and to the elevator car and machine room and similar locations outside the hoistway for a distance not exceeding 6 ft. Electricity is often one of the initial services to fail during a storm. You'll be responsible for specifying the items related to the fire alarm and some controls, as well as supplying lighting and power to the equipment room and elevator pit. The Electrical Ups and Downs of Elevator Design | EC&M This is somewhat broader than A17.1-2007/B44-07. Pits shall be maintained in a clean and dry condition. Elevator Pit Sump Pump Electrical Requirements By Nat July 30, 2022 Bulls Eye (Simplex) Receptacles: Bulls eye (simplex) receptacle for Sump pumps (now not - GFI) on a delegated circuit will be required in all elevator pits for the elevator pit sump pump. 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. 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.
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