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. Wiring requirements are outlined in Part III of this Article. 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. It can seem such a tedious process, especially since elevator code falls under many different bodies. 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. The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. You will see an interesting new development below. Status of normal power to the elevator equipment, elevator machinery and electrical apparatus cooling equipment where provided, . /Parent 3 0 R>> First, you'll need to install lighting in the elevator equipment room (Photo 1) and shaft pit (Photo 2). Please check your entries and try again. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. All rights reserved. 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. Elevator feeder demand factors 620 620.14 Fire pumps, voltage drop (mandatory calculation) 695 695.7 Fixed electric heating equipment for pipelines and vessels, branch-circuit sizing . xAD 'fjhD&5}[/FBznQ5\R1XwRJ9VQJq !jOj13G^J9[k/:vul c% Selective coordina-manufacturer uses components in combination with tion is also required for multiple elevators per NEC overcurrent protective devices that are tested and 620.62. A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. The architect has a choice of either traction or hydraulic elevators. Other Consideration A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. You need to Subscribe to continuing reading. We're honored to be recognized by our employees and The Dallas Morning News by making the daily newspapers Top 100 Places to Work list for the 3rd year in a row, falling in at 28th in the midsize companies category. Years may lapse between the design and installation stages of a project. +R#% Luminaires must be lensed or equipped with wire guards to protect the lamps. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. The elevator equipment room that serves a hydraulic elevator is almost always located on the lowest floor adjacent to the elevator shaft. Section 3003.1 requires that where standby power is required or furnished to . endstream Here's what property managers should be thinking about when it comes to their own onsite emergencies. of the sprinkler heads. 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. In such cases, it's economically justifiable to specify a traction type elevator. SPECIAL CONSTRUCTION. The electrical system designer calculates the maximum available fault current at the elevator controller. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. Click to reveal Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. Our directories are updated monthly and include website links to help you quickly find your elevator code authority for your state. These are the principle NEC 2011 Article 620 mandates. But by understanding how these items fit together and what purpose they serve, you can have a successful project. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. SECTION3004 CONVEYING SYSTEMS 3004.1General. endobj NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. The panel further clarified that the marked SCCR value must be adequate for the available fault current to ensure a safe installation. They must be in enclosures with doors or removable panels that can be locked in the closed position. Heres what you need to verify. Minnesota amendments to those documents are located in chapter 1307. The traveling cable or raceway is also permitted to include shielded conductors and/or one or more coaxial cables. \ A&&'70 Sk*EZfm}1csX)9R5R8jW5J)+5s!?>)%Xv}/)_x>j@WCw[ 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. Always verify all conditions and requirements with the state and the AHJ where the installation is taking place. endobj This is typically accomplished via a shunt trip device. 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. 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. Chapter 24 Glass and Glazing. For instance, a typical elevator controller may traditionally have SCCR ratings from 5 to 10 kA. If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. pipes, ducts) removed from the elevator space and hoistway (ASME A17.1 Section 2.8), Fire extinguisher provided in the machine/control room (ASME A17.1 Rule 8.6), Normally operable door closer with self-locking lockset from within machine room provided (ASME A17.1 Rule 2.7.3.4), Machine/control room provides 19 foot candles of illumination at floor level (ASME A17.1 Rule 2.7.9), Elevators located on an accessible route and comply with ASME A17.1 Safety Code for Elevators and Escalators- freight elevators not included (ADA 4.10.1), Each elevator car is equipped with an automatic self-leveling feature independent from the elevator operating device that brings cars to floor landings 1/2 under rated loading to zero loading conditions (ADA 4.10.2), Elevator call buttons are centered at 42 above the floor (ADA 4.10.3), Elevator call buttons have visual signals that notify when a call is both registered and answered (ADA 4.10.3), Elevator call buttons are no smaller than (ADA 4.10.3), Elevator call buttons are raised/flush (ADA 4.10.3), Any objects below elevator call buttons do not project into the lobby more than 4 (ADA 4.10.3), There is a visible and audible signal at every hoistway that communicates which elevator will be answering the call (ADA 4.10.4), Audible signals: either sound once to indicate up and twice to indicate down, or use verbal announcements that state Up and Down, Hall lantern fixtures center lines are located at least 72 above the floor, Raised and Braille floor indications are provided on all elevator hoistway entrances on both jambs (ADA 4.10.5), Elevator doors open and close automatically, included with an automatic device that stops and reopens car and hoistway door if door is obstructed by object or person without requiring contact (ADA 4.10.6), Door devices remain effective for at least 20 seconds, The minimum time for elevator doors to remain fully open in response to a car call is 3 seconds (ADA 4.10.8), Space is provided for a wheelchair user to enter, reach controls and exit the elevator car (ADA 4.10.8), Cab length is at least 51 with at least 54 from the back of the cab to the face of the door, Cab width for side opening doors is at least 68, Cab width for center opening doors is at least 80, Floor surfaces are slip resistant (ADA 4.10.10), If carpet is used it has pile thickness or lower and all exposed edges are fastened with carpet edge trim, At least 5 foot candles are used for car controls, platform, car threshold and landing sill (ADA 4.10.11), Meets car control panel requirements (ADA 4.10.12), Control buttons are raised/flush and are at least , Control buttons are designated by Braille, Floor buttons for side approach are 54 or lower above finish floor, Floor buttons for front approach are 48 or lower above finish floor, If car has center opening doors, controls are located on front wall, If car has side opening doors, controls are located on front wall next to door or side wall, A visual indicator is provided above the cars control panel to relay the position of the elevator within the hoistway with corresponding numbers that illuminate and an audible signal as each floor is passed or stopped on (ADA 4.10.13), The highest operable part of an elevators two-way emergency communications system is 48 or lower from the floor of the elevator car (ADA 4.10.14), The elevators two-way emergency communications system is established by a raised/recessed symbol and lettering adjacent to the device (ADA 4.10.14), Elevator machine/control room venting has appropriate fire dampers in penetrations, Depending on the location, smoke dampers are installed in machine/control room venting, If floor is one or more stories above or below the level of exit discharge, a two-way communication system is provided at the landing serving each elevator or bank of elevators, Ground-fault circuit interrupter (GFCI) protected, receptacle outlets are provided in the pit and the machine/control room (NEC 620.23 ( c ), NEC 620.4 ( c ), NEC 620.85), Car lights and receptacles are on a 15AMP separate branch circuit with a lockable over current protecting device located in the machine room (NEC 620.22, NEC 620.53), Over current protecting device is externally operable, fused/thermally protected, lockable disconnecting means (NEC 620.22, NEC 620.53), There is a separate branch circuit for the machine room light and receptacles (NEC 620.23), There is a separate branch circuit for the pit light and receptacle with at least 10 foot candles (NEC 620.24). 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. NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. 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. See our free download with an in-depth look at elevator communication codes and easy elevator phone testing methods >>, Kings III of America Announces CEO Transition, Apple iPhone Setting Ties Up 911 Call Centers, Types of Emergency Phones: Glossary and Resources, Kings III Makes The Dallas Morning News Top 100 Places to Work List Becoming a 3x Winner, Best Practices for Using Video Surveillance on Your Property, Arcline Investment Management to Acquire Kings III of America, Saving Labor and Service Costs During Inflation, How Your Life Safety Devices are Impacted by Landline Technology Phaseout, A clean and dry elevator pit and machine/control room provided (ASME A17.1 Rule 2.1.2), Machine/control room meets manufacturers 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), Functioning two-way communication provided (ASME A17.1 Section 2.27), Elevator calls directed to a 24-hour live monitoring service that is able to respond to emergencies (ASME A17.1 Section 2.27), Two-way message display in cab for hearing and/or speech impaired, Means for authorized personnel to view video of passengers anywhere in cab, Means activiated by emergency personnel to change cab message to indicate help is on-site if over 60 ft of travel, Smoke detectors located in every lobby and in the elevator machine room, with lobby detectors zoned- no built-in time delay, verification not permitted (Both ASME A17.1 Section 2.27 and, Flashing hat signal is provided in the elevator in the event that a smoke detector is activated (Both ASME A17.1 Section 2.27 and, Any equipment/accessories unrelated to elevator use/function/operation (i.e. In these installations, it is best to design the elevator controller so the elevator controller SCCR is adequate for the available fault current. Many people use portable generators until power is restored. NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. a 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. 2 0 obj . endstream CHAPTER 33. Fluid pressure in the cylinder raises and lowers the elevator cab. Traction elevators are typically installed in a bank of elevators where fused switches, or circuit breakers in a panelboard are located in the machine room serving the bank of elevators. 12 13can be easily accomplished if the elevator controller NEC in 700.32, 701.27 or 708.54. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. Marking the available short-circuit (fault) current on the controller by the equipment installer. 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. The elevator rails, like the ground system of the entire building electrical structure, are to be bonded to the lightning-system ground electrode so these all remain at the same potential even during a lightning event, ensuring side flash does not occur. As always, the best advice in all instancesdo your homework, communicate often, and document decisions made. 636 0 obj <>/Filter/FlateDecode/ID[<3E99A7B842E11E4FB63B954D41726BE2><6699822AC16E0F4781D4BCC76F310E14>]/Index[615 32]/Info 614 0 R/Length 105/Prev 243084/Root 616 0 R/Size 647/Type/XRef/W[1 3 1]>>stream GET YOUR CEUS TODAY, 1998-2021. 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. There are options available to achieve this depending upon the customers needs. <> stream 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. Kings III is an ETL Listed Central Station, providing code compliant all-inclusive emergency help phone solutions for all areas of your property. Privacy Policy 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. As such, elevator controller manufacturers should make the effort to rethink their designs to avoid costly system design changes. 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. In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation.