Group 5 - Nema Standards PDF

THE NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION GROUP 5  WHEN DID NEMA CREATED? NEMA, created in the fall of 1926 by the merger of the Electric Power Club and the Associated Manufacturers of Electrical Supplies, provides a...

THE NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION GROUP 5  WHEN DID NEMA CREATED? NEMA, created in the fall of 1926 by the merger of the Electric Power Club and the Associated Manufacturers of Electrical Supplies, provides a forum for the Standardization of electrical equipment, enabling consumers to select from a range Goals of safe, effective, and compatible electrical products. The organization has also made numerous contributions to the electrical industry by shaping public policy development and operating as a central confidential agency for gathering, compiling, and analyzing market statistics and economics data.  DEBRA PHILLIPS Is the President and CEO of the National Electrical Manufacturers Association (NEMA). Ms. Phillips served as Senior Vice President at the American Petroleum Institute (API). She led a global team responsible for standards, certification, training, events, membership, publications, and safety programs related toon shore, offshore, pipeline, and refinery operations in locations worldwide. Her leadership brought significant revenue to API. Prior to API, Phillips was part of the leadership team at the American Chemistry Council (ACC) for nearly two decades. She managed the Responsible Care initiative, a global program focusing on environmental, health, safety, and security performance in over 60 countries. Phillips has experience as an environment, health, and safety professional in the chemical and pulp and paper industries. She holds a master's degree in environmental toxicology from Duke University and an undergraduate degree in biology from Albright College. BUT WHAT IS THE PURPOSE OF THE NEMA ?  THE PURPOSE OF NEMA The purpose is to provide the safety, environment, and marketing enhancement of the industry.  HOW NEMA STANDARDS ARE DEVELOPED A NEMA Standard defines a product, process, or procedure with reference to one or more of the following: nomenclature, composition, construction, dimensions, tolerances, safety, operating characteristics, performance, rating, testing, and the service for which the product(s) are designed.  THE STANDARDS DEVELOPMENT PROCESS There are five basic steps taken to create a new. 1.STANDARD Project initiation Before any significant work is done on a project, the NEMA section or duly authorized committee of the section must give their approval (by a simple majority). The section records project initiation on a Project Initiation Request (PIR) form. The Engineering department adds an entry in to its Standards database and begins tracking progress on the Standard.  2. DEVELOPING THE DRAFT The section typically delegates the development of a draft Standard to a technical committee, subcommittee, or task force. For new Standards, a new subcommittee or task force may be established. The section or technical committee designates the chair, who holds a meeting to develop a plan for completing the work. An outline of the Standard maybe developed and the work divided among the Members. Most of the work involved in developing a Standard is completed between meetings by one or more Members. Completed sections of the drafts standard are prepared and distributed to the entire group for review and comment. Comments are addressed by the group as a whole. Once the comments are resolved, the draft standard is revised and distributed again. The draft standard may go through several iterations until there is consensus in the group that the draft is ready to move on.It is now forwarded to the full technical committee for review and comment. Comments are compiled and addressed by the group that developed the draft. Once the technical committee’s comments have been satisfied, its Members will decide if the draft is ready to ballot to the section (or voting classification).  3. BALLOTING (GATHERING COMMENTS) All proposed Standards publications are provided in a uniform format, as defined in NEMA NS 1-2005. Prior to issuing, the letter ballot must be reviewed by NEMA Counsel. Votes from a section or voting class for a Standards bulletin is generally taken by letter ballot with a 30-day window for response. All letter ballots allow Member’s votes to be cast in the affirmative, in the negative, or as “not voting.” A NEMA Member who manufactures the product is eligible to vote on Standards pertaining to that product. Any member may change a vote within the voting period unless they waived the right to do so on the letter ballot, but no Member may change a vote given by letter ballot after the voting period expires. A Standard, when presented to any section or voting class for approval, requires the affirmative vote of at least two-thirds of the votes cast in the affirmative or negative. In lieu of a letter ballot, a Standard proposal may be approved at a section or voting class meeting, provided 100 percent of the section or voting class Membership is present. Where there are votes accompanied by comments, the proposed Standard and result of the letter ballot are referred to the technical committee or its delegated subcommittee within 30 days following completion of the letter ballot. If after due consideration the technical committee cannot resolve all negative comments of a successful ballot, the technical committee chairman submits the proposed Standard to the Codes and Standards Committee (C&S),which may request written comments or oral presentations from both sides to assist in its review. A comment maybe with drawn or, at the option of the Member, changed to an affirmative vote in writing. If there are no comments or the comments accompanying all negative votes on the letter ballot are withdrawn, the proposed Standard is submitted to C&S.  4. CODES AND STANDARDS COMMITTEE APPROVAL All actions of sections and voting classes in approving, revising, reaffirming, or rescinding Standards of the association aresubject to the approval of C&S. In approving, disapproving, or reviewing NEMA Standards, C&S acts only by the concurrent vote of a majority of its Members given either at a meeting or by letter ballot. In its review of a proposed Standard, C&S determines whether: TheStandard is in harmony with the policies of NEMA standardization activities and has been developed according to the procedures contained in the NEMA constitution and bylaws; the interests of all affected NEMA subdivisions have beenconsidered; the Standard is technically sound and accurately drawn; any recommendations should be made to NEMA Counsel concerning compliance of the Standard with NEMA policies and procedures; and, the record presented by the subdivision proposing the Standard shows that adequate consideration has been given to both safety and userneeds. C&S may determine that a proposed. Standard is of the potential concern to other sections or voting classes and refer it to them before approval. When a proposed Standard is referred, they are given a period of 45 daysto reply. If no reply is received, C&S may assume that there is no interest or no objection to the proposed Standard.If referral to other subdivisions is not necessary and the Standard also complies with the criteria above, C&S will approve the proposal for publication as a NEMA Standard. This becomes the Standard’seffective date.  5. EDITING AND PUBLICATION Once C&S approves the proposed Standard, it is submitted to NEMA’s Communications department, which edits the document in compliance with the NEMA Style Manual. When completed, the proposed Standard is returned to the responsible staff Member for final review and approval by the appropriate section representative. Generally, an editorial committee conducts the final editorial review. Any changes requested by the editorial committee are implemented by the Communications department, and the document is then forwarded to the publisher, Global Engineering, for printing and distribution. Capacitor Distribution Automation Electrical Connector Electrical Measuring Equipment Electrical Measuring Equipment: Electrical Metering Energy Storage High Voltage Insulator Surge Arrester Switchgear Transformers Transformers1:Dry-Typ& Specialty  BUILDING INFRASTRUCTURE Building Infrastructure AFCI Cable Bus Cable Cleat Cable Ties and Positioning Devices Cable Tray TRANSPORTATION SYSTEMS MITA LIGHTING SYSTEMS BUILDING SYSTEM  NEMA ENCLOSURE An enclosure is a type of protective box or cover that shields equipment from different forms of damage NEMA ENCLOSURES CAN PROTECT YOUR ORGANIZATION’S ELECTRICAL COMPONENTS FROM: Water Snow and Sleet Human Dirt, Dust and Debris Oil Explosion  NEMA 250 Enclosure Types NEMA EN P1- 2020  SCOPE: The purpose of this document is to provide general information on the definitions of NEMA enclosure types, a guide for comparing specific applications of enclosures, and a comparison between NEMA enclosure type numbers, and ANSI/IEC enclosure classification designations. The document is intended for use by architects, engineers, installers, inspectors, and other interested parties.  NEMA TYPE 1 NEMA Type 1 Enclosures are intended for indoor use primarily to provide a degree of protection against contact with the enclosed equipment.  NEMA TYPE 2 NEMA Type 2 Enclosures are intended for indoor use primarily to provide a degree of protection against limited amounts of falling water and dirt.  NEMA TYPE 3 NEMA Type 3 Enclosures are the Most basic type of outdoor enclosures and provide solid protection for non-hazardous outdoor environments.  NEMA TYPE 3R NEMA TYPE 3R NEMA Type 3R Enclosures are similar to Type 3, but provide slightly less protection against wind blown dust.  NEMA TYPE 3S NEMA Type 3S Enclosures are similar to Type 3, but must retain control operability when external ice forms on the enclosure.  NEMA TYPE 3X NEMA Type 3X Enclosures are similar to Type 3, provide additional protection against corrosion.  NEMA TYPE 3RX NEMA Type 3 RX Enclosures are a combination of the features of Type 3R and Type 3X.  NEMA TYPE 3SX Enclosures are a combination of the features of Type 3S and Type 3X.  NEMA TYPE 4 NEMA Type 4 Enclosures are strong outdoor enclosures suitable for a wide variety of outdoor and indoor applications.  NEMA TYPE 4X Enclosure has the Addition of corrosive resistance Impared to a NEMA 4 enclosure.  NEMA TYPE 5 Enclosures are designed for indoor use to protect against a wide variety of airborne particulates and light water ingress.  NEMA TYPE 6 Enclosures are designed for tough outdoor applications that require high performance waterproof enclosures.  NEMA TYPE 6P Enclosures are similar to Type 6,but Include additional protection against prolonged submersion.  NEMA TYPE 7 Enclosures Indoor Hazardous Locations-Air- break Equipment - Type 7 enclosures are intended for use indoors, in the atmospheres and locations defined as Class 1, Division I and Group A, B, C or D in the National Electrical Code. The letter or letters A, B, C or D, which indicate the gas or vapor atmospheres in the hazardous location, appear as a suffix to the designation "Type 7" to give the complete NEMA designation and correspond to Class 1, Division 1, Group A, B, C or D, respectively, as defined in the National Electrical Code  NEMA TYPE 8 Enclosures Indoor Hazardous Locations-Oil- immersed Equipment- Type 8 enclosures are intended for use indoors, in the atmospheres and locations defined as Class 1, Division I and Group A, B, C or D in the National Electrical Code. The letter or letters A, B, C or D, which indicate the gas or vapor atmospheres in the hazardous location , appears as a suffix to the designation "Type 8" to give the complete NEMA designation and correspond to Class 1, Division 1, Group A, B, C or D, respectively, as defined in the National Electrical Code.  NEMA TYPE 9 Enclosures are dust-ignition proof A NEMA 9 enclosure is suitable for specific indoor hazardous locations. Certified and labelled for use in areas with specific hazardous conditions: for in door and out door use in locations classified as ClassII, Groups E , F ,or Gas defined in NFPA standards such as the NEC  NEMA TYPE 10 MESA (Formally Bureau of Mines) Type 10 enclosures are designed to meet the requirements of Schedule 2G (1968) of the Mining Enforcement Safety Administration, U.S. Department of the Interior, for equipment to be used in mines with atmospheres containing methaneor natural gas, with or without coal dust.  NEMA TYPE 11 Indoor - Corrosion-resistant and Drip proof- Oil-immersed - Type 11 enclosures are corrosion-resistant and are intended for use indoors to protect the enclosed equipment against dripping, seepage and external condensation of corrosive liquids. In addition, they protect the enclosed equipment against the corrosive effects of fumes and gases by providing for immersion of the equipment in oil. They shall have conduit hubs or equivalent provision for watertight connection at the conduit entrance and mounting means external to the equipment cavity.  NEMA TYPE 12 Enclosures are indoor enclosures designed for general use with a greater degree of protection than Type 1 or Type 2.  NEMA TYPE 12K Enclosures are similar to Type 12, but include pre- constructed knockouts to accommodate cables, antennas and other equipment.  NEMA TYPE 13 Enclosures are similar to Type 12, but include additional protection against oil and coolant seepage. NEMA STANDARDS FOR ELECTRIC MOTORS NEMA (National Electrical Manufacturers Association) developed a set of standards relating to electric motors that include design classes, frame sizes, enclosures, and configurations. A basic knowledge of NEMA standards can prove invaluable when looking for a new, replacement, or surplus motor.  NEMA DESIGN A maximum 5% slip high to medium starting current normal locked rotor torque normal breakdown torque suited for a broad variety of applications - like fans and pumps  NEMA DESIGN B maximum 5% slip lowstarting current highlocked rotor torque breakdown torque suited for a broad variety of applications with normal starting torques - common in HVAC application with fans, blowers and pumps  NEMA DESIGN C maximum 5% slip lowstarting current highlocked rotor torque normal breakdown torque suited for equipment with high inertia and high starting torques at start- like positive displacement pumps, conveyors  NEMA DESIGN D maximum 5-13%slip lowstarting current veryhigh locked rotor torque suited for equipment with very highinertia starts - like cranes, hoists etc.  NEMA FRAMES NEMA Frames size numbers provide you information about the different size of numbers with key of they don’t tell you the horsepower, at numbers are normally associated with more horsepower. NEMA Frames NEMA designates certain enclosure types for motors and divides them into two categories: 1.NEMAOpen Machines ✔ OpenDrip Proof (ODP) ✔ Weather Protected I (WPI) ✔ Weather Protected II (WPII) 2.NEMATotally Enclosed Machines ✔ Totally Enclosed Fan Cooled (TEFC) ✔ Totally Enclosed Non-Vented (TENV) ✔ Washdown Enclosures (WDN) ✔ Explosion-Proof (XPRF) NEMA OPEN MACHINES OPEN DRIP PROOF (ODP)  NEMA OpenMachines weather Protected I (wPI)  NEMA OpenMachines weather Protected II (wPII)  NEMA TotallyEnclosed Machines Totally Enclosed Fan Cooled (TEFC)  NEMA TotallyEnclosed Machines Totally Enclosed Non-Vented (TENV)  NEMA TotallyEnclosed Machines WASHDOWN ENCLOSURES (WDN)  NEMA TotallyEnclosed Machines EXPLOSION-PROOF (XPRF)  BASIC NEMA MOTOR CONFIGURATIONS There are three commonly used NEMA motor configurations: standard duty/general purpose, severe duty, and IEEE 841 Motors. They intended for different applications and, as a result, usually have different types of enclosures, bearings, and appropriate work environments. BASIC NEMA MOTOR CONFIGURATIONS STANDARD DUTY OR GENERAL PURPOSE MOTORS BASIC NEMA MOTOR CONFIGURATIONS IEEE841 MOTORS THANK YOU