national electrical code การใช้

• In 1960 the National Electrical Code required ground wires in all new houses.
• Comprehensive installation procedures are spelled out in the National Electrical Code.
• The U . S . National Electrical Code provides rules for technical power installations.
• Does the National Electrical Code say anything about the practice?
• In Canada, the Canadian Electrical Code serves the same purpose as the American National Electrical Code.
• The National Electrical Code prohibits recessed electrical boxes.
• Students attending the Electrical Practices and Standards classes are taught the National Electrical Code and conduit bending.
• In the U . S ., the National Electrical Code requires neutrals to be of this type.
• The first electrical codes in the United States originated in National Electrical Code " ( NEC ).
• The National Electrical Code now prohibits this because the ears are small and have only three screw threads.
• In the United States 2011 National Electrical Code ( NEC ) is the standard regulating most electrical installations.
• The United States'National Electrical Code and Canadian electrical code only define neutral as the grounded, not the polyphase common connection.
• In Europe, these regulations are found in the ATEX directives, and in the United States, in the National Electrical Code.
• Technical requirements of the Canadian Electrical Code are very similar to those of the U . S . National Electrical Code.
• An Ufer ground of specified minimum dimensions is recognized by the U . S . National Electrical Code as a grounding electrode.
• In addition, the National Electrical Code will require the new breakers, which are more sensitive, in circuits serving bedrooms beginning in 2002.
• In addition, these local codes or ordinances often supplement the National Electrical Code with additions or restrictions that are applicable to the area.
• As of the 1999 National Electrical Code, AFCI protection is required in new construction on all 15A and 20A 125V circuits to bedrooms.
• The National Electrical Code specifies that the wires must be protected with either heavy-duty plastic vinyl sheathing, flexible armored sheathing or metal conduit.
• The " zone " system of classification is now used in modified form in National Electrical Code and in the Canadian Electrical Code.