As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. 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. We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. The fan should be on a dedicated circuit. 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. 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. 2m9 `K]f*F gaR NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. Metal grating shall be installed over the hole that sits flush with the pit floor. This is somewhat broader than A17.1-2007/B44-07. A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. 1. 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. To avoid this situation, designers can specify elevator controls with a safety feature commonly called a rescuvator. 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. Additional requirements concern escape routes. He also required GFCI protection for the hard-wired sump pump that did not require it. C.1.4 ELEVATOR PIT REQUIREMENTS 1. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. 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. In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. It is worth mentioning that when 600 V is talked about as a limit in the NEC, it is generally meant that the familiar 600-V nominal-voltage system is considered to lie within the permitted zone, making it a common usage. As they review the plans and the construction site, they may have conflicting interpretations or requirements. These selective coordination tables for current-limiting fuses show the minimum amp ratio required between a pair of fuses of a given type(s) to achieve selective coordination. For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. Where voltages exceed 600, a sign reading DANGER HIGH VOLTAGE is required. 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. There are options available to achieve this depending upon the customers needs. Eazylift Albany LLC, 836 Troy Schenectady Rd, Latham, NY, Elevators The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. 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. First, it is now clear that elevator controllers must be marked by the manufacturer with their SCCR. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. Pits shall be maintained in a clean and dry condition. hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] 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. 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. As stated in Section 7 of the Elevator Industry Field Employees Safety Handbook: Unless it is not feasible, (i.e. It states an elevator is permitted to be run by an emergency or standby power system. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. In Part One of this series (ELEVATOR WORLD, April 2012), we began an examination of National Electrical Code (NEC) 2011 mandates for elevators and related equipment installations. 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. Escalator Pit Light and Receptacle 620.23 | Mike Holt's Forum 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. The sum of the cross-sectional area of the individual conductors in raceways is not to exceed 40% of the interior cross-sectional area of the raceway, except as permitted for wireways. The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. Fluid pressure in the cylinder raises and lowers the elevator cab. 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. 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. Many of these are for portable lighting.). Sumps and sump pumps in pits, where provided, shall be covered. 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. (A) tells us that the lighting and receptacle (s) for the pit must be on separate circuits. David Herres The floor specified as the designated landing, which must be approved by the Fire Marshal, is usually the floor on grade level so passengers can quickly exit to the outside. 4.0 (2 Reviews) (2) CLAIMED . 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. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. Each of these performs a different function, and the wiring mandates vary accordingly. The many codes and guidelines that regulate the electrical design of an elevator can seem overwhelming, and dealing with the electrical inspector, elevator inspector, and Fire Marshal can be even more intimidating. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc (e) Pit Maintenance. Such vehicles include, but are not . NEC has a further note that the term wheelchair lift has been changed to platform lift.. Provide continuous, non -slip, horizontal rungs every 12" for the full height of the pit ladder. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. You can email the site owner to let them know you were blocked. (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. 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. The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. 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. Three wiring categories within hoistways are allowed in addition, each with exceptions. It begins by considering metal and nonmetallic wireways. NEC Article 620 covers elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts. Additionally, duty on elevator and dumbwaiter motors is rated as intermittent, whereas duty on escalator and moving-walk motors is considered continuous. 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). Corporate Office Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. This is the area within the hoistway beneath the car, and there are occasions when elevator technicians have to work in this area for maintenance and troubleshooting. Where necessary, it is mandated that suitable guards be provided to protect the cables against damage. 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. 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. All Rights Reserved | Contact Us | Privacy Policy. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. Traveling cables are to be supported by one of these means: Looping the cables around supports for unsupported lengths less than 100 ft. The light switch for the equipment room must be adjacent to the entrance door on the latch side. 836 Troy Schenectady Road ; Latham, NY 12110 . 354 Morgan Ave. As such, elevator controller manufacturers should make the effort to rethink their designs to avoid costly system design changes. Car air-conditioning and heating units 3. This is not the elevator companys responsibility. Even non-composite fiber-optic cable, which does not carry electrical energy, is subject to the code. We generally think of the 19th century as the great age of building codes. Moreover, because motors have a higher starting current than other loads, the overcurrent protection protocol is unique to them and somewhat counterintuitive. NEC Guidelines on Commercial Garages. Elevator motors are inherently intermittent duty. But by understanding how these items fit together and what purpose they serve, you can have a successful project. 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. +90 (216) 348 4876, India Office NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. from the exposed components, and the incident energy calculated at 18 in. Instruments: Use category III multimeters and be familiar with their use and limitations. 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. PDF Electric Elevator Checklist Cover Page - Oregon Similarly, the integrity of the traveling cable is emphasized. 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. Design practices that are acceptable in some jurisdictions may not be in others. 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. 2023 Endeavor Business Media, LLC. From the website: Mohawk Lifts offers car lifts and auto lifts for purchase, including 2 post lifts, 4 post lifts, storage lifts, heavy duty mobile column lifts, parallelogram lifts, and other specialty items. Weight (passengers, freight, car and attendant machinery) may be fairly substantial, and speed is significant. This clear working space must be 30 in. Elevator Pit Drain or Sump Pump | UpCodes Part VIII, Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces, states elevator and similar-installation driving machines, motor-generator sets, motor controllers and disconnecting means are to be installed in a room or space set aside for that purpose.
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