The two documents are in harmony and should be used in conjunction. Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. 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. 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. These 29 CFR 1910.146 (c) (8) requirements are: All rights reserved. For elevators that regenerate power back into a power source unable to absorb the regenerative power under overhauling elevator load conditions, a means to absorb this power is to be provided. h-`7 This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. Flexible cords and cables part of listed equipment operating at 30 V (42 VDC) or less, similarly supported and protected, jacketed and flame retardant, are permitted. For current-limiting fuses, the information to achieve selective coordination has been available for many years in fuse amp ratio tabular form. (f) Illumination of Pits. There are options available to achieve this depending upon the customers needs. And so the needs can be very different. For instance, a typical elevator controller may traditionally have SCCR ratings from 5 to 10 kA. Additional branch circuits are to supply other utilization equipment not covered above. But the lights don't have to be in the pit itself. proved for elevator locations - car, hoistway, pit and a-chine roo equireents in Article odify the articles in Chap - ter For eaple, it is stated that the cross-sectional area The Code provides guidance through regulations to establish requirements. 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. For example, an inadequately supported ceiling fan could fall and cause injury or property damage. We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. NEC articles generally adhere to a template, which greatly aids in navigating and quickly locating mandates as needed for project design or, on an installation level, in the field. As stated in Section 7 of the Elevator Industry Field Employees Safety Handbook: Unless it is not feasible, (i.e. 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. Mobile, AL 36606 USA It is of great importance that power to the various elevator functions can be quickly and reliably removed from the loads in case of emergency or for maintenance and troubleshooting. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. (g) Stop Switch in Pits. Special conditions: Troubleshooting in wet, hot or cold conditions calls for extra caution. Where multiple driving machines are connected to a single elevator, there is to be one disconnecting means to disconnect the motor(s) and control-valve-operating magnets. In contrast to the lighting, these receptacles must be connected to GFCI devices. 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). Corporate Office 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. 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. hbbd```b``+3dL `Y[gw9`RLJO*A$w$@L`F*{|0 P or larger is permitted to be installed in lengths in excess of 6 ft. Where motor-generators, machine motors or pumping-unit motors and valves are located adjacent to or underneath control equipment and provided with extra-length terminal leads not exceeding 6 ft. in length, such leads are permitted to be extended to connect directly to controller terminal studs without regard to carrying-capacity requirements. The next section, 620.36, concerns different systems in one raceway or traveling cable. 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. Proper selective coordination in a multi-elevator installation on the same feeder ensures if one elevator develops a fault, the other units will not be shut down. . 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. Such design innovations require sophisticated wiring strategies. 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. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. As they review the plans and the construction site, they may have conflicting interpretations or requirements. 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. For just $7.99 per month, you can gain access to more than 5,000 articles from all Elevator World Publications, this includes EW Global, EW Europe, EW India, EW Middle East, EW Turkey, and EW UK. Bonding of elevator rails to a lightning-protection system grounding conductor is permitted, but the conductor itself is not to be located in the hoistway. In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation. You are a subscriber that needs to Sign In. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ Nevertheless, the primary NEC focus is on elevators, and the intention is to mitigate the hazards associated with the use of electricity. from the exposed components, and the incident energy calculated at 18 in. This is typically accomplished via a shunt trip device. 2. In such cases, it's economically justifiable to specify a traction type elevator. ASME A17.1, Section 2.2.5, National Electrical Code, Rule 620-85 4. Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. 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. 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. This will normally require you to vent the room with a fire/smoke damper and include smoke detector signals in the control logic. A further requirement concerns elevator-car air-conditioning and heating. Furthermore, at least one 125-V, single-phase, 15- or 20-amp duplex receptacle is to be provided in each machine room or similar location. Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. Metallic articles: Remove metallic articles such as watches, chains, bracelets, earrings, belt buckles and keychains before troubleshooting. Cross-sectional areas of wireways are found by multiplying the two interior dimensions.) 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. However, this can vary depending on building conditions and exterior grade. 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. Indeed, most elevator accidents involve maintenance workers, yet even theirs is not an excessively dangerous profession. [emailprotected] 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. Hazards created by water, snow or condensation in the work area can cause slips, falls and accidental contact. He is saying that each pit requires a separate circuit, in other words "dedicated". Another important electrical system design consideration for supplying power to multiple elevators is NEC 620.62. Elevator travel is far safer than an automobile trip, and the chance of experiencing disaster is on the order of being struck by lightning in ones own backyard. Selective coordination is also required for multiple elevators per NEC 620.62. 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. The electrical energy does not traverse the human body, but proximity to the explosion means severe injury is possible from the intense heat and concussive shockwave. (C) Duplex Receptacle. Here, the National Electrical Safety Code has jurisdiction. 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. Your IP: 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. If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. An exception provides that liquid-tight flexible metal conduit or liquid-tight flexible nonmetallic conduit 3/8 in. (e) Pit Maintenance. Flexible cords and cables (same conditions as within hoistways). However, space is frequently limited within the shaft and as such many ancillary components (shunt trip circuit breakers, fused disconnects) may need to be located outside of the elevator shaft. Machine room-less elevator installations incorporate the elevator controller and often the primary disconnecting means in a convenient package that is located within the elevator shaft. This, however, can result in a dramatic increase in cost, space availability (lack thereof), and reduced efficiency. A surge of immigration to the U.S., the end of slavery and, on both sides of the Atlantic Ocean, a burgeoning industrial revolution ignited an acceleration in new building. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. High-rise buildings pose additional concerns. 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. Notice the definition mentions the full range of operating times. The basic requirement is for minimum clear distances of various depths for equipment operating at 600 V or less, nominal, depending upon voltage to ground and lateral distance to insulated or grounded surfaces or exposed live parts (not an issue in elevator machine rooms). 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. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. Utility-owned electrical structures not directly concerned with electrical generation, transmission and distribution are NEC regulated. So, we see that for elevator work, greater fill is allowed. 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. If elevators are supplied by the emergency, legally required standby or critical operation power systems, then selective coordination is required per the 2017 NEC in 700.32, 701.27 or 708.54. 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. Beginning with Article 320, Armored Cable (Type AC) and concluding with Article 398, Open Wiring on Insulators, each code-sanctioned cable and raceway is treated, ranging from the familiar Type NM (trade name Romex) to the exotic Integrated Gas Spacer Cable (Type IGS). These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. Elisha Otis safety elevator, introduced in 1853, prevented the fall of the car if the cable broke. But, building codes had been in existence for many centuries. 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? The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. The new ADAAG guidelines now require that emergency power be available to elevators that have four or more stories of travel above or below the accessible floor [4.1.3(9)(1)]. NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. NEC specifies Hoistway wiring, and doesn't seem to distinguish between hoistway and pit. Instruments: Use category III multimeters and be familiar with their use and limitations. 6 Stop Switch in Pits There shall be installed in the pit of each elevator an ASME A17.1 CODE enclosed stop switch or switches meeting the requirements The following material is reprinted with permission from the American of 2.26.2.7 and 2.2.6.1 through 2.2.6.3. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. Years may lapse between the design and installation stages of a project. He also required GFCI protection for the hard-wired sump pump that did not require it. 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. ), a duplex 15A 120-volt receptacle in pit with ground- fault circuit protection and a 15A 120-volt Non GFCI receptacle for the sump pump. Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. Corporate Office Thus, the traveling cable must be supported by a steel supporting member. NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. Besides the initial determination requirement of paragraph (c) (1), the "host" employer must comply with the five (5) requirements of paragraph (c) (8) when engaging another employer (contractor) who will have employees in permit spaces under the control of the host employer. The sump pump/drain shall have the capacity to remove a minimum of 11.4 m. 3 /h (3,000 gal/h) per elevator. You need at least one 120VAC GFCI-protected receptacle at each location. hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] You need to Subscribe to continuing reading. 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. A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. You are seeing this message for one of three reasons: You have reached your limit of free content. 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. Related Code Sections 802.1.8 Indirect/Special Waste, Elevator Pit Drain or Sump Pump If it kills the son of the owner, the son of that builder shall be put to death.. Get directions, reviews and information for Eazylift Albany LLC in Latham, NY. All Rights Reserved | Contact Us | Privacy Policy. Machine room/control space lighting and receptacles 4. For platform lifts and stairway chairlifts, the duty is intermittent. Where a feeder powers more than one elevator, you need selective coordination; the OCPDs must be series-designed so a fault at one of the elevators will be cleared by only the OCPD serving it. 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). +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. A traditional elevator installation (which includes a machine room) requires access inside the elevator shaft. 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. 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 Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Overload protection for motors is to conform with Article 430, Part III, the general code area that covers motor and branch-circuit overload protection for all motors. In driving through commercialized suburban areas, you frequently see paralleled conductors for large retail grocers (where there is a heavy refrigeration load). 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. While machine room-less designs have been commercially available for many years, their use may still be unknown to some AHJs. Working spaces for electrical equipment that may have to be examined, adjusted, serviced or maintained is required in all occupancies in an earlier NEC section, 110.26(A). If the building has emergency power available, use it to supply the cab lights. Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. 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. Cross-sectional areas of conduits are given in Chapter 9, Table 4. Many professionals believe the NEC is applicable only for voltages over a certain level, but that is not the case. We have circuited the receptacles and lights in the pits to the same circuit. 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. This strategy works to improve the flexibility of the traveling cable, but it is contrary to a general NEC rule concerning the paralleling of conductors, which is generally done in very large sizes to avoid unwieldy wire pulls and terminations. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. 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. The lighting switch shall be located so as to be readily accessible from the pit access door. He had been with Eaton (Cutler-Hammer and Bussmann) since 1993 and specializes in training on the design and application of overcurrent protective devices and equipment in electrical distribution systems in accordance with the National Electrical Code and equipment in accordance with the various product standards. If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. Guarding: Where possible, install temporary guarding to protect from inadvertent contact.