For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. When you consider that an elevator is an enclosed room with one or more doors that people voluntarily enter so they may travel hundreds of feet up or down, several observations are in order. C.1.4 ELEVATOR PIT REQUIREMENTS 1. Finally, typical installations and compliance with all these requirements will be discussed. The elevator equipment room that serves a hydraulic elevator is almost always located on the lowest floor adjacent to the elevator shaft. ASME A17.1 . These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. First, you'll need to install lighting in the elevator equipment room (Photo 1) and shaft pit (Photo 2). There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. 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. 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. 2m9 `K]f*F gaR However, when I've put in elevators, NEC seems to always take a back seat to ANSI, which seems . Eazylift Albany LLC, 836 Troy Schenectady Rd, Latham, NY, Elevators z!0: - [Content_Types].xml ( n0EUb*>-RxV=QUAl"93dFk%Y?l}MGDV You are a subscriber that needs to Sign In. A raceway that comes loose on the inside of a hoistway could catch on a moving car, causing immense damage and hazard to users. 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. 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. Requirements in Article 620 modify the articles in Chapter 3. One way to achieve this is by paralleling wires, i.e., connecting the runs at both ends so they are physically like two wires but electrically one. Though I understand how someone might argue two. Indeed, most elevator accidents involve maintenance workers, yet even theirs is not an excessively dangerous profession. Machine room/control space lighting and receptacles 4. PDF Compliance with the 2017 NEC for Elevator Controllers But, building codes had been in existence for many centuries. 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. 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 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. Motor controllers are permitted outside the spaces specified above. They are permitted to be run without raceway when used inside the hoistway, on the elevator car, hoistway wall, counterweight, or controllers and machinery located inside the hoistway, provided they are in their original sheaths. 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? To safeguard the passengers and electrical equipment, ASME A17.12.8.2.3.2 requires the power source to the elevator control panel to shut down prior to the discharge of water from a sprinkler head. Personal protective equipment (PPE): Use appropriate PPE to protect body parts within the range of 3-16 in. 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. endstream endobj 954 0 obj <. The feeder OCPD needs to remain closed so the remaining elevators have power and continue to function. ranged from 0.06 cal/cm2 to 0.95 cal/cm2, which indicates that the arc-flash hazard to employees is primarily to the hands and arms. In fact, an entire elevator system for a project is most often designed and specified by the architect who has little understanding of the electrical distribution system. As such, elevator controller manufacturers should make the effort to rethink their designs to avoid costly system design changes. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. 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. ) > 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 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. 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. We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. 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. The most complex of these is the elevator. 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. Corporate Office 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. 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. The two documents are in harmony and should be used in conjunction. He participates in IEEE (Senior Member) with Industrial and Commercial Power Systems, NEMA (member of the Codes & Standards Committee), NFPA (committee member for NEC CMP-13 and NFPA 79), UL (508/60947 and 508A) and IAEI activities. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. PDF Q.When and where are GFCI's required by the NC Electrical Code 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. 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. The AHJ is saying that this is a violation of 620.23. NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) [emailprotected] Many new buildings are incorporating an elevator design that does not include an equipment room (sometimes called machine room-less elevators). 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. The lighting switch shall be located so as to be readily accessible from the pit access door. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. (A) tells us that the lighting and receptacle (s) for the pit must be on separate circuits. See Section 3 of the. of the sprinkler heads. The two primary hazards are fire and electric shock or arc flash, although there are others. So, we see that for elevator work, greater fill is allowed. 2. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. Hydraulic elevator pit | Electrician Talk 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. Please check your entries and try again. Adhering to the requirements will ensure a hazard-free electrical installation. The traveling cable, of necessity, is exempted. PDF C.1 General Requirements for All Elevator Installations 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. 3. Your elevator supplier will take care of all the wiring and related code requirements for the elevator cab and the various controls. ), 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. 2023 Endeavor Business Media, LLC. !>x=yy Bvv8?~e PK ! Of particular importance is the location of the disconnecting means so it can be found by an individual who may not be familiar with the installation. The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. However, it is likely that for many elevator controllers, this may not be high enough for the available fault current where they will eventually be installed. As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. However, this can vary depending on building conditions and exterior grade. Elevator cab lights require emergency back-up power. Firefighters can then use portable telephone handsets in combination with the jacks and cabling. 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. A different occurrence involves exposure to the explosive blast when there is a line-to-line or line-to-ground arc blast. 354 Morgan Ave. 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. 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. In all cases, the working space must permit at least a 90 opening of equipment doors or hinged panels. Flexible cords and cables, or conductors grouped together and taped or corded, are permitted to be installed without a raceway. Notice the definition mentions the full range of operating times. +91 8025357028, 2022 Elevator World, LLC. The two main types of elevators are hydraulic and traction. 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. 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. Guidance in determining whether elevator pits meet the definition of No provision is to be made to automatically restore power. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. 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.. Requirements for commercial garages per the National Electrical Code. Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. 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. Cylinders in hydraulic elevators usually aren't suitable for buildings taller than five stories. There are options available to achieve this depending upon the customers needs. NEC has a further note that the term wheelchair lift has been changed to platform lift.. 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 room is to be secured against unauthorized access (kept locked). The pump sends hydraulic fluid from the reservoir to the cylinder, buried deep below the elevator shaft. For circuit breakers, time-current curves must be consulted as well as the circuit breaker manufacturers selective coordination tables. You'll need to run telephone cables to the equipment room control panel, but the elevator supplier will take care of getting the cables to the elevator cab. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Hoistway pit lighting and receptacles 5. The disconnecting means is to be located adjacent to or an integral part of the motor controller. The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. 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. 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. This is typically accomplished via a shunt trip device. 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. In hoistways not longer than 6 ft., these additional wiring methods are permitted: A sump or oil-recovery pump located in the pit is permitted to be cord connected. We have circuited the receptacles and lights in the pits to the same circuit. Hazards created by water, snow or condensation in the work area can cause slips, falls and accidental contact. 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. Frequently Encountered Items That Delay Accep Tance of New Elevators 68 | WWW.ELEVATORWORLD.COM | June 2012 Continuing Education .