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This standard contains the requirements for ferrous metallic abrasive used for the removal of rust, mill scale, paint, or other surface coating systems by blast cleaning (see Note 7.1). This standard covers previously unused abrasive material. It does not address cleanliness of recycled abrasive...
NEMA AB 4 sets forth, for use by qualified personnel,1 a number of basic procedures that may be used for the inspection and preventive maintenance of molded case circuit breakers used in industrial and commercial applications rated up to and including 1000 V 50/60 Hz AC or AC/DC....
Foreword This is an update to a NEMA white paper originally published in 2005. To ensure that a meaningful publication was being developed, draft copies were sent to a number of groups within NEMA having an interest in this topic. Their resulting comments and suggestions provided vital input prior...
Introduction The hazards of arc flash have received considerable attention in recent time for a number of reasons. When an arcing fault occurs, the harmful results can be devastating and deadly for those who are not properly prepared. Because of the potentially long-term effects, not only is the...
This paper provides information on the following topics: 1) Description of the key functions of the overcurrent protective devices (OCPDs) used in low-voltage applications for meeting selective coordination requirements per the latest edition of the NEC [18] 2) Discussion of selective coordination...
This standard provides requirements for selecting and evaluating abrasive media encapsulated in a compressible non-uniform cellular matrix used to blast clean steel and other surfaces prior to the application of protective coatings. The standard also includes requirements for quality control of new...
This standard contains requirements for the cleanliness of recycled ferrous metallic blast cleaning abrasives (the "work mix") used for the removal of coatings, paints, scale, rust and other foreign matter from steel or other surfaces. Laboratory and field testing procedures to determine...
This standard contains requirements for classification, evaluation, and performance of mineral and slag or other by-product abrasives used for blast cleaning steel and other surfaces for painting and other purposes. The abrasives covered by this standard are primarily intended for one-time use...
Foreword This is an update to the NEMA white paper originally published in 1994. To ensure that a meaningful publication was being developed, draft copies were sent to a number of groups within NEMA having an interest in this topic. Their resulting comments and suggestions provided vital input...
Foreword This is an update to a NEMA white paper originally published in 1994. To ensure that a meaningful publication was being developed, draft copies were sent to a number of groups within NEMA having an interest in this topic. Their resulting comments and suggestions provided vital input prior...
Introduction The 2005 National Electrical Code® (NEC) introduced a change regarding series ratings for circuit breakers that deserves careful review before applying an engineered series rating. The additional section 240.86(A) reads: (A) Selected under Engineering Supervision in Existing...
Introduction NEMA has long recognized that equipment short circuit current ratings and interrupting ratings are determined by the engineer or contractor after understanding the available fault currents to which they will be subjected. Utilities have longstanding practices to provide a...
Foreword This is an update to "Hazards of Working Electrical Equipment Hot," a NEMA white paper originally published in 1994. To ensure that a meaningful publication was being developed, draft copies were sent to a number of groups within NEMA having an interest in this topic. Their resulting...
FOREWORD This is an update to the NEMA white paper originally published in 1994. To ensure that a meaningful publication was being developed, draft copies were sent to a number of groups within NEMA having an interest in this topic. Their resulting comments and suggestions provided vital input...
This application guide covers molded case circuit breakers and molded case switches, single-pole and multi-pole, fused and unfused, as well as accessories used with them. These circuit breakers and switches are assembled as integral units in supporting housings of insulating material and have rated...
Foreword This is an update to the NEMA white paper originally published in 1998. To ensure that a meaningful publication was being developed, draft copies were sent to a number of groups within NEMA having an interest in this topic. Their resulting comments and suggestions provided vital input...
The scope of this standard includes all types of circuit breakers listed to: 1) The UL 489 Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures 2) The UL 1066 Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures The standard specifically...
Introduction Modern technology has helped make homes safer and more convenient, but conflicts in performance criteria between interdependent products can result in inconvenience for the homeowner. Designers of home electrical products (HEPs) seek to meet the demands for improved customer...
ABSTRACT RP-1395 is a continuation of an earlier project where the heat dissipated by indoor power distribution equipment is estimated. In RP-1104 certain equipment were examined while others were not. The goals of RP-1395 was to provide verification of some of the information presented in RP-1104...
