The IEC 60446 standard, “Basic and Safety Principles for Man-Machine Interface, Marking, and Identification,” establishes global guidelines for identifying electrical equipment terminals, conductors, and wiring colors. Make sure your box sits in a dry, easy-to-reach spot with good airflow. Look for neat cables, solid grounding, and the right wire size. Each circuit should have its own breaker or fuse. Check for UL or CE marks and make sure everything follows local codes. Look for damage and test with a multimeter. National Electrical Installation Standards, NEIS, and the NEIS logo are trademarks of the National Electrical Contractors Association. Scope This publication describes graphic symbols used to. Electrical junction boxes are accessible enclosures, mainly made of metal or plastic, where splices and connections of electrical wiring distribution lines are located and protect electrical and electronic devices and circuits from the environment and improper handling. Wiring diagram shows both PNP and NPN wiring. Dimensions are shown in mm (in.
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