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nec elevator pit requirements

APPENDIX A 2.2. 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. 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. The traveling cable, of necessity, is exempted. PDF NEC Article 0: Elevator art 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. 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). 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. Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. 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. The two primary hazards are fire and electric shock or arc flash, although there are others. As they review the plans and the construction site, they may have conflicting interpretations or requirements. -inch conduit is needed to the sump pump. The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. Based on the analysis, the arc-flash boundaries at the elevator/escalator controllers ranged from 3-16 in. Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. Machine room/control space lighting and receptacles 4. All elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. 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. Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. The disconnecting means is to be located adjacent to or an integral part of the motor controller. Cylinders in hydraulic elevators usually aren't suitable for buildings taller than five stories. 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? First, it is now clear that elevator controllers must be marked by the manufacturer with their SCCR. PDF Elevator Safety Program - Technical Clarification 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 noted that the article covers the installation of electrical equipment and wiring for elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts. Conductors supplying a single power transformer are to have an ampacity not less than the nameplate current rating of the power transformer plus all other connected loads. 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. Good documentation is of key importance to recalling what decisions were made and why. But by understanding how these items fit together and what purpose they serve, you can have a successful project. Similarly, the integrity of the traveling cable is emphasized. Sumps and sump pumps in pits, where provided, shall be covered. Escalator Pit Light and Receptacle 620.23 | Mike Holt's Forum (f) Illumination of Pits. +;-mka|7! Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. Guidance in determining whether elevator pits meet the definition of The action you just performed triggered the security solution. 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. A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. 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 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. The conductors must be in their original sheaths or grouped together and taped or corded. endstream endobj 954 0 obj <. 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. My reasoning comes from 620.24 (A) and (C). This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. Design practices that are acceptable in some jurisdictions may not be in others. Selective coordination is also required for multiple elevators per NEC 620.62. NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. Therefore, elevator equipment rooms must maintain a temperature between 50F and 90F. Elevator cab lights require emergency back-up power. 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. 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. Many professionals believe the NEC is applicable only for voltages over a certain level, but that is not the case. 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. 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. Article 620s Definitions section includes two terms that describe spaces not attached to the outside of a hoistway. The sump pump/drain shall have the capacity to remove a minimum of 11.4 m. 3 /h (3,000 gal/h) per elevator. For instance, a typical elevator controller may traditionally have SCCR ratings from 5 to 10 kA. Guarding: Where possible, install temporary guarding to protect from inadvertent contact. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. 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). Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. Here, the National Electrical Safety Code has jurisdiction. Section 620.85, GFCI Protection for Personnel, provides that 125-V, single-phase, 15- and 20-amp receptacles installed in pits, hoistways, machinery spaces, machine rooms, escalators and moving walks, and on elevator car tops are to be GFCIs. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. Every building is different. Overcurrent devices protecting these branch circuits are to be located in the machine room or similar location. An example would be the elevator, as well as all wiring in a utility-owned administration building. These requirements, found in Article 620 (part of Chapter 6, Special Equipment), are in addition to NEC Chapters 1-3, which stipulate general wiring protocols applicable in most residential, commercial and industrial venues. IAEI News Magazine. See Section 3 of the. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. (A) Separate Branch Circuit. DOCX 26 80 00 - Elevator Electrical Requirements - University of Illinois Your elevator supplier will take care of all the wiring and related code requirements for the elevator cab and the various controls.

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nec elevator pit requirements

　

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