定价： 92元 / 折扣价： 79 元

定价： 204元 / 折扣价： 174 元

定价： 0元 / 折扣价： 0 元

This standard established acceptable performance criteria for solid-state electricity meters including: class designations, voltage and frequency rating, test current values, service connection arrangements, pertinent dimensions, form designations, and environmental tests for types "S: and "A" meters.

定价： 87元 / 折扣价： 74 元

The NESC covers: 1. Supply and communication facilities (including metering) and associated work practices employed by a public or private electric supply, communications, railway, trolley, street and area lighting, traffic signal (or other signal), irrigation district or other community owned utility, or a similar utility in the exercise of its function as a utility. 2. The generation, transmission, and distribution of electricity, lumens, communication signals, and communication data through… read more public and private utility systems that are installed and maintained under the exclusive control of utilities or their authorized representatives. 3. Utility facilities and functions of utilities that either (a) generate energy by conversion from some other form of energy such as, but not limited to, fossil fuel, chemical, electrochemical, nuclear, solar, mechanical, wind or hydraulic or communication signals, or accept energy or communication signals from another entity, or (b) provide that energy or communication signals through a delivery point to another entity. 4. Street and area lights that provide a supply of lumens where these facilities are supplied from the line side of the service point by underground or overhead conductors maintained and/or installed under the exclusive control of utilities (including their authorized contractors or other qualified persons). 5. Utility facilities and functions on the line side of the service point supplied by underground or overhead conductors maintained and/or installed under exclusive control of utilities located on public or private property in accordance with legally established easements or rights-of-way, contracts, other agreements (written or by conditions of service), or as authorized by a regulating or controlling body. 6. Wiring within a supply station or in an underground facility that is (a) installed in accordance with Part 1 or Part 3 of this Code and maintained under the exclusive control of utilities and (b) necessary for the operation of the supply station or underground facility. 7. Utility facilities installed, maintained, and controlled by utilities on surface or underground mine sites, including overhead or underground distribution systems providing service up to buildings or outdoor equipment locations on the line side of the service point. 8. Similar systems to those listed above that are under the exclusive control of qualified persons and authorized by a regulating or controlling body, including those associated with an industrial complex or utility interactive system. read less

定价： 214元 / 折扣价： 182 元

定价： 321元 / 折扣价： 273 元

定价： 265元 / 折扣价： 226 元

The application guide for relay protection of squirrel-cage and wound-rotor induction motors presents a review of the generally accepted forms of motor protection and summarizes the use of relays and devices, singly and in combination, to enable the reader to properly select the necessary equipment to obtain adequate motor protection. The Guide is prepared primarily for the protection of three-phase integral-horsepower motors and refers to single- or two-phase motors only in special instances… read more and only where specifically indicated. It is especially useful where the motor installation is sufficiently important, due to either its size or the consequences of motor malfunction, to justify specific design of the protective system. It also provides the information necessary to judge whether there are safety or economic reasons for such a specific design. This Guide is not a Standard and does not purport to detail the protective requirements of all motors in every situation. Its recommendation is of a general nature designed to cover the usual or typical motor installation. Sufficient background of material on objectives, application, and setting philosophy is presented, however, to enable the reader to evaluate the need for various forms of protection and to select and properly apply suitable protective equipment for most situations. read less

定价： 65元 / 折扣价： 56 元

The purpose of this document is to provide guidelines for the use of automatic test equipment (ATE) for the measurement of electromagnetic emissions of electronic, electrical, and electro-mechanical equipment. It is intended to be a companion document to ANSI C63.2-19961 and ANSI C63.4-2003 for making accurate and repeatable automated emissions measurements from 9 kHz to 1 GHz according to commercial Electromagnetic Interference (EMI) regulations. As such, it addresses automated measurement… read more processes, automatic test equipment, and measurement integrity aspects. Furthermore, the importance of a test plan will be outlined. Although intended for automatic testing, these guidelines also apply to semiautomatic measurements where only parts of a test may be automated. read less

定价： 110元 / 折扣价： 94 元

定价： 135元 / 折扣价： 115 元

Over the years many electromagnetic compatibility measurement and control standards have been developed. Many of these are of concern to particular classes of devices such as receivers, transmitters, incidental radiation devices, etc. In establishing limits, it is necessary to relate the measurement technique used to determine compliance with a given limit to the field conditions under which the device being controlled will actually operate. The purpose of this standard is to set forth, at… read more least for reference purposes, a suggested set of limits which may find general application. This document does not set specific limits. It presents a rationale for developing limits and recommends a set of limits that are representative of current practice. In practice these limits1 may be adjusted in particular applications as circumstances dictate. This document does not consider limits for industrial, scientific, and medical (ISM) equipment which specifically uses radio frequencies as a major part of its operation. As part of the development of limits, the following parameters should be considered: 1) The general properties of both man-made and natural environmental noise 2) An understanding of the devices commonly used for measurement of radio noise and their properties, which will assist the practitioner in selecting such equipment and associated measurement techniques for the particular application 3) The rationale that can be used in selecting a consistent set of limits for emission and immunity, (susceptibility) subject to various environmental constraints (good engineering practice) These practices are intended to be applicable to individual equipment as well as systems of various sizes and, if properly applied, will provide guidance for obtaining both intrasystem and intersystem compatibility. This standard is organized as follows: Section 2 references instrumentation and measurements methods, Section contains a list of definitions, Section 4 describes environmental radio noise, and Section describes the selection of measurement parameters. Section 6 discusses limit setting, and Section is a list of references. read less

定价： 184元 / 折扣价： 157 元

This standard establishes calibration methods for portable radiation protection instruments used for detection and measurement of levels of ionizing radiation fields or levels of radioactive surface contamination. For purposes of this standard, portable radiation protection instruments are those which are carried by hand to a specific facility or location for use. Although this standard is specific to portable radiation protection instrumentation, the basic calibration principles may be… read more applicable to radiation detection instrumentation in general. Included within the scope of this standard are conditions, equipment, and techniques for calibration as well as the degree of precision and accuracy required. Alpha, beta, photon, and neutron radiations are considered. Passive integrating dosimetric devices such as film, Thermoluminescent, and chemical dosimeters are outside the scope of this standard, but the basic principles and intent may apply. In cases where integrating capability is included along with rate measurement or detection, this standard shall apply. Throughout these criteria, four verbs have been used to indicate the degree of rigor intended by the specific criterion. "Shall" and "will" indicate a minimum criterion that must be met, while "should" and "would" indicate a criterion that is recommended as good practice and is to be applied when practical. read less

定价： 95元 / 折扣价： 81 元

This standard provides training requirements for four levels of training as part of the domestic capabilities of public safety agencies to detect, analyze, and report on nuclear and other radioactive materials that are out of regulatory control. This standard describes training requirements applying to these training levels across the range of federal, state, tribal, territorial, and local governments, and the private sector conducting the preventive radiological/nuclear detection (RND) mission… read more to reduce the risk of terrorists or covert state-sponsored attacks on the United States using radiological or nuclear weapons of mass destruction (WMDs). Of the preparedness capabilities described in Presidential Policy Directive 8: National Preparedness (PPD-8), the scope of this standard includes the capabilities for Prevention and Protection mission areas, but not those for Mitigation, Response, and Recovery mission areas. Within the Prevention and Protection mission area capabilities explained in the U.S. Department of Homeland Security (USDHS) National Preparedness Goal, the scope includes core capability for Screening, Search, and Detection. In particular, the scope of this standard describes requirements for training on the operation and deployment of the following radiation detection instrumentation as used in the RND mission: Alarming personal radiation detectors (PRDs), reference ANSI N42.321; Portable radiation detection instrumentation, reference ANSI N42.33; Handheld instruments for the detection and identification of radionuclides, i.e., radionuclide identifiers, radioisotope identification devices (RIIDs), references ANSI N42.34 and USDHS 500-DNDO-117250; Radiation portal monitors (RPMs) and spectroscopy-based portal monitors (SRPMs), references ANSI N42.35 and ANSI N42.38; Vehicle-mounted mobile systems and transportable radiation monitors, references ANSI N42.43 and USDHS 500-DNDO-119430; Spectroscopic personal radiation detectors (SPRDs), reference ANSI N42.48; Backpack-based radiation detection systems (BRDs) and human-portable detectors (HPDs), references ANSI N42.53 and USDHS 500-DNDO-119420 Training scope includes safety-related instruments used by RND personnel, such as: Alarming electronic personal emergency radiation detectors (PERDs), reference ANSI N42.49A; Non-alarming PERDs, reference ANSI N42.49B. The scope does not include the capabilities specific to nuclear safeguards, security of nuclear facilities, nuclear forensics, or technical reachback analysis. Although they are not the focus of this standard, radiation detection instruments used primarily for other missions and capabilities (e.g., Response and Recovery mission areas) may have some applications for RND mission areas and capabilities. Training requirements from this standard should be considered for all radiation detection instrumentation used for any RND mission areas. read less

定价： 129元 / 折扣价： 110 元

This standard is applicable to coaxial high voltage connectors on nuclear instruments for dc applications up to 5000 volts and ac applications up to 3500 volts rms at 60 Hz. The connectors may also be used at higher frequencies provided the operating voltage is appropriately reduced.

定价： 88元 / 折扣价： 75 元

This standard encompasses monitoring all types of airborne radioactivity including aerosols, noble gases, iodines, and tritium in the workplace, in effluent, and in the environment. This standard includes initial design, manufacture, minimum performance, performance testing, calibration, and maintenance requirements. This standard covers both real-time monitors and air samplers.

定价： 104元 / 折扣价： 89 元