Therefore, there will be two signals to the elevator control panel related to smoke detectors: one from the designated floor smoke detector and another combined signal from the smoke detectors at the other lobby landings and in the equipment room. Weight (passengers, freight, car and attendant machinery) may be fairly substantial, and speed is significant. APPENDIX A 2.2. 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. 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. In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. 4.0 (2 Reviews) (2) CLAIMED . . Part of the reason that elevator usage is extraordinarily safe is that construction and maintenance are regulated by the wonderfully robust ASME A17.1 2007/CSA B44-07 Safety Code for Elevators and Escalators, which contains overall construction and maintenance requirements everything from seismic mandates to machine-room lighting. Conductors supplying a single motor are to have an ampacity not less than the percentage of motor nameplate current determined from Section 430.22(A) and (E). A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. NEC has a further note that the term wheelchair lift has been changed to platform lift.. (To design and install an elevator for a Class I, Division 1 location would be quite an undertaking.). The sump pump/drain shall have the capacity to remove a minimum of 11.4 m. 3 /h (3,000 gal/h) per elevator. One. As such, elevator controller manufacturers should make the effort to rethink their designs to avoid costly system design changes. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. In driving through commercialized suburban areas, you frequently see paralleled conductors for large retail grocers (where there is a heavy refrigeration load). 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. 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. 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. ASME A17.1, Section 2.2.5, National Electrical Code, Rule 620-85 4. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ 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. In some cases, it may require a means to test the shunt trip operation or have one contact operate the shunt trip of more than one elevator. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). This room is to be secured against unauthorized access (kept locked). Machine room/control space lighting and receptacles 4. If the smoke detector at the designated landing goes into alarm, the elevator will stop at a predetermined alternate floor, which is usually the floor above the designated floor. [emailprotected] 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. 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. Such cable groups are to be supported at intervals not over 3 ft. and located so as to be protected from physical damage. 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. To avoid this situation, designers can specify elevator controls with a safety feature commonly called a rescuvator. Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. 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. [emailprotected] You need at least one 120VAC GFCI-protected receptacle at each location. 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. The electrical system designer calculates the maximum available fault current at the elevator controller. Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. Mike Holt. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. charlie b. 3. He is saying that each pit requires a separate circuit, in other words "dedicated". For current-limiting fuses, the information to achieve selective coordination has been available for many years in fuse amp ratio tabular form. In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation. 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. Always verify all conditions and requirements with the state and the AHJ where the installation is taking place. 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. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. Corporate Office 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. It is also essential that machine-room lighting be totally reliable and separate from the machinery supply to facilitate troubleshooting in the event of elevator problems. The surest means of avoiding an arc-flash hazard is to lockout and tagout the electrical service to a controller. If you can illuminate the pit using lights that are "above the top of the pit" (whatever that . Cables used in Class 2 power-limited circuits are permitted between risers and signal equipment and operating devices, provided they are supported and protected from physical damage and are of the jacketed and flame-retardant type. Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. Acceptable types of wire for this application are given in Table 400.4, which occurs in an earlier chapter and lists various types of elevator cable for lighting and control in both unclassified and hazardous locations. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. [emailprotected] Upon loss of power, the rescuvator controls the cab, lowers it to the designated floor, and opens its doors. Each of these performs a different function, and the wiring mandates vary accordingly. 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. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. 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). 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. Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. 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. +91 8025357028, 2022 Elevator World, LLC. 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. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. All Rights Reserved | Contact Us | Privacy Policy. 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. This is especially true in an elevator shaft where measures have to be taken to ensure that a hazardous situation is not created. Article 620s Definitions section includes two terms that describe spaces not attached to the outside of a hoistway. All elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. We generally think of the 19th century as the great age of building codes. This clear working space must be 30 in. In elevators provided with Firefighters' Emergency Operation, a drain or sump pump shall be provided. You are a subscriber that needs to Sign In. Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. Good documentation is of key importance to recalling what decisions were made and why. It need not be exactly centered on the equipment, and working spaces of adjacent pieces of equipment may overlap. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. In an elevator machine room, where space may be limited in the first place, the working-space mandate must be factored in very early in the design process lest an unthinkable amount of rework be necessary. (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. 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. A separate branch circuit shall supply the hoistway pit lighting and receptacle (s). 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. Here are 23 ways that both chapters and the national office can meet todays major challenge of making members feel valued, IAEIs Online Training allows you to learn at your own pace or live with an expert instructor, from the comfort of your laptop or PC. ), advise the building owner to correct the condition. 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. 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. 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. The disconnecting means is also to be a listed device. Moreover, it is necessary to consider future worker safety for an indefinite period. If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. 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. or larger, not over 6 ft. in length. Elevator motors are inherently intermittent duty. 2. 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 Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. 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. 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. 836 Troy Schenectady Road ; Latham, NY 12110 . Jul 15, 2021. The conduit alone can't act as the grounding means. 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. GFI Receptacles: GFI receptacles shall be required in all elevator machine rooms, machinery spaces and elevator pit areas. Your IP: You are seeing this message for one of three reasons: You have reached your limit of free content. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. The thinking behind this requirement is that the injured worker could have severe hand burns and be unable to operate a conventional doorknob. Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing. For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. 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. If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. The light switch in the pit must be mounted 42 in. 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. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. Marking the available short-circuit (fault) current on the controller by the equipment installer. It is further stressed that no provision is to be made to open or close the disconnecting means from any other part of the premises. This accomplishes two functions. The pump sends hydraulic fluid from the reservoir to the cylinder, buried deep below the elevator shaft. The idea is quite simple. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. IAEI News Magazine. Here, the National Electrical Safety Code has jurisdiction. And as the designer, you can become the fulcrum on which all of these requirements and authorities exert their leverage, but an understanding of elevator basics can help you handle the pressure. Many NEC articles address voltage limitations, and Article 620 is no exception. Every building is different. Flexible cords and cables (same conditions as within hoistways). +1-251-479-4514 | [emailprotected], Trkiye Office hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. Car air-conditioning and heating units 3. !>x=yy Bvv8?~e PK ! The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. The traveling cable or raceway is also permitted to include shielded conductors and/or one or more coaxial cables. ASME A17.1 . 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. Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. 6 feet, and shall meet the requirements of NEC 70 620.21(A)(1)(d). They must be in enclosures with doors or removable panels that can be locked in the closed position. +90 (216) 348 4876, India Office These are the individual branch circuits required for car lighting, receptacles, auxiliary lighting and ventilation on each elevator car; individual branch circuits for machine-room and similar location lighting and receptacle; and branch circuits for hoistway pit lighting and receptacle(s). hbbd```b``+3dL `Y[gw9`RLJO*A$w$@L`F*{|0 P 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. Sign up for our free e-newsletter. 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. 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)]. q!^mDtsnEX3_ shvqu+X9@w3gSj`g 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. Pit drainage must be designed to eliminate a minimum capacity of 3,000 gallons per hour (or 50 GPM) per elevator car. Hoistway door interlock wiring from the riser must be flame retardant and have insulation suitable for a temperature not less than 200C (392F), much higher than that required for most raceway or cable applications. 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. Each fused switch or circuit breaker in the panelboard is used as an elevator disconnect. These 29 CFR 1910.146 (c) (8) requirements are: The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. of the sprinkler heads. However, this can vary depending on building conditions and exterior grade. 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. A different occurrence involves exposure to the explosive blast when there is a line-to-line or line-to-ground arc blast. When the elevator car is at the top landing, it is the length of cable as measured from the point of suspension on the car to the bottom of the loop. This website is using a security service to protect itself from online attacks. Metallic articles: Remove metallic articles such as watches, chains, bracelets, earrings, belt buckles and keychains before troubleshooting. 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. Your elevator supplier will take care of all the wiring and related code requirements for the elevator cab and the various controls. NFPA 72 requires the control circuit between the Fire Alarm System and the shunt trip be monitored for integrity. ) > 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 PK ! By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. To achieve flexibility and endurance, traveling cable is more finely stranded and, where possible, separated into discrete conductors. 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. Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. 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.. Similarly, the integrity of the traveling cable is emphasized. If a hydraulic elevator loses power because a heat detector goes off or for any other reason it could trap occupants for an unpleasant amount of time. This is somewhat broader than A17.1-2007/B44-07. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. 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. Three wiring categories within hoistways are allowed in addition, each with exceptions. above the pit floor, shall: Be weatherproof (NEMA 4). 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 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. 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. Another important electrical system design consideration for supplying power to multiple elevators is NEC 620.62. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Please check your entries and try again. And so the needs can be very different. If it kills the son of the owner, the son of that builder shall be put to death.. Follow the manufacturers instructions and precautions. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. The usual scenario for electrical injury is shock when electrical current passes through the human body. It states an elevator is permitted to be run by an emergency or standby power system. (All intentionally grounded elements must be held at equal potential.) Traction elevators raise and lower the elevator cab with cables, a pulley system, and counter weights powered by a motor at the main drive wheel. 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. It is worth noting that these NEC terms, used throughout Article 620, have been chosen to correlate with A17.1-2007 usage. 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. As stated in Section 7 of the Elevator Industry Field Employees Safety Handbook: Unless it is not feasible, (i.e. Mobile, AL 36606 USA [emailprotected] NEC Article 620 covers elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts. Both electric and nonelectric elevators are to comply with Article 250, the code article that covers grounding and bonding in general. But, building codes had been in existence for many centuries. 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. All of these options and special wiring can be challenging depending upon the location of the shunt trip circuit breaker as well as who has responsibility for providing these additional options. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. Fuses: Verify that the correct size, type and capacity are installed. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. 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. Part X, Emergency and Standby Power Systems, is simple and straightforward. The demand factor ranges from 1.00 for one elevator on a single feeder to 0.72 for 10 or more elevators on a single feeder.
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