Electical Contractor

Article 110 Requirements for Electrical Installations; Article 210 Branch Circuits; Article 250 Grounding and Bonding; Article 314 Outlet, Device, and Pull and Junction Boxes, Fittings, and Handholes; Article 350 Liquidtight Flexible Metal Conduit: Type LFMC; Article 517 Health Care Facilities; Art

An estimator asked what method to use to calculate the volt-amperes (VA) of a residence. He hoped to use the results as a guide to estimate the elements of the electrical system and wanted the standard method applied.

Article 210 Branch Circuits; Article 230 Services; Article 250 Grounding and Bonding; Article 366 Auxiliary Gutters; Article 422 Appliances; Article 517 Health Care Facilities; Various articles in Chapters 6, 7 and 8 are mentioned.

Many are aware that electrical equipment arcing and sparking -can cause chemical atmospheres (gases, vapors and dusts) to ignite. However, we often forget that thermal ignition of these chemical atmospheres also can occur if the chemicals are exposed to high temperatures.

This article is a continuation of designing and installing electrical systems rated over 600 volts. Note that specific equipment as well as wiring methods and other items that form a complete high-voltage system are discussed. Selecting switchgear—490.30 through 490.47

Article 110—Requirements for Electrical Installations; Article 210—Branch Circuits; Article 215—Feeders; Article 314—Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures; Article 334—Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS; Article 517—Health Care Fa

In the last few editions of the National Electrical Code (NEC), more electrical equipment has been required to be rated for short-circuit current.

A contracting firm I work for is bent out of shape over the new revised Section 210.4(B) and (D) in the National Electrical Code (NEC). The firm, plainly speaking, said this was going to require time to police the trimming out of a panelboard.