Connecting modern 4 wire appliances in older homes with 3 wire systems. Older 3-wire wiring may not be NEC compliant. NEC 250.140 states that “Frames of electric ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, and outlet junction boxes that are part of the circuit for these appliances shall be connected to the equipment grounding …
Arc-Flash: Worth a Hazard Assessment Arc-Flash: Worth a Hazard Assessment The dictionary describes an electric arc as “a luminous bridge formed in a gap between two electrodes”. It sounds a little like the meeting of Harry Potter and He-Who-Must-Not-Be-Named’s wands, and doesn’t look entirely different, really. Powerful as those wizards may be, an electrical arc …
NEC 2020 changes will require Type 1 or Type 2 Surge Protection Device (SPD) on dwelling unit electrical services. The Requirement for SPDs In an effort to reduce the risk of injury and potential damage to electrical systems and buildings, the newest version of the National Electrical Code, the NEC 2020, will require the installation …
Calculating Conduit Fill Most electricians today carry around an Ugly’s book like this one. It has a lot of reference tables in it that we use everyday and is small and convenient to carry around as we go from job to job. The Uglys book has a section on conduit fill, taken from Annex C …