Electical Contractor

Article 220 contains provisions for calculating branch-circuit, feeder and service loads. Following the requirements set forth in this article will provide the minimum size branch circuit, feeder or service.

This is the conclusion of a two-part article that began in the November issue. This part provides important information for listing and National Electrical Code requirements for installations of emergency, legally required standby and optional standby systems.

Though lightning season may be over by now, it is worth reviewing the impact storms can have on the operation of a facility. Some may have experienced significant damage to equipment from the high frequency transient energy of lightning strikes.

210.70(A)(2) Lighting Outlets Required Lighting outlet and wall switch provisions for dwelling units, guest rooms (hotel, motel and similar occupancies) and certain areas in non-dwelling occupancies are covered in 210.70(A) through (C).

CODE CITATIONS Article 110 Requirements for Electrical Installations Article 230 Services Article 240 Overcurrent Protection Article 250 Grounding Article 310 Conductors for General Wiring Article 400 Flexible Cords and Cables Article 406 Receptacles, Cord Connectors and Attachment Plugs (Caps) Arti

CODE CITATIONS Article 110 Requirements for Electrical Installations Article 250 Grounding Article 334 Nonmetallic-Sheathed Cables: Types NM, NMC and NMS Article 422 Appliances Article 517 Health Care Facilities Article 680 Swimming Pools, Fountains and Similar Installations Grounding a feeder circ

210.70(A)(2) Lighting Outlets Required Requirements specifying wall switch-controlled lighting outlets (or receptacles) are covered in 210.70. This section contains three subsections: dwelling units, guest rooms and other than dwelling units.

Article 210 Branch Circuits Article 215 Feeders Article 240 Overcurrent Protection Article 300 Wiring Methods Article 320 Armored Cable Article 352 Rigid Nonmetallic Conduit Article 404 Switches Article 604 Manufactured Wiring Systems Article 680 Swimming Pools, Fountains and Similar Installations A

210.70(A)(1) Lighting Outlets Required Lighting outlet requirements are covered in the last section of Article 210. Branch circuits supplying lighting outlets must be installed in accordance with the provisions in 210.70(A) through (C).