By (NFPA) National Fire Protection Association
Secure, effective, code-compliant electric installations are made uncomplicated with the newest booklet of this broadly well known source. Like its hugely winning earlier versions, the National electric Code 2011 softcover model combines good, thorough, research-based content material with the instruments you must construct an in-depth realizing of crucial issues. New to the 2011 variation are articles together with first-time Article 399 on outdoors, Overhead Conductors with over six hundred volts, first-time Article 694 on Small Wind electrical structures, first-time Article 840 on Premises Powered Broadband Communications structures, and extra. The nationwide electric Code is followed in all 50 states, and is a vital reference for these in or coming into careers in electric layout, install, inspection, and protection.
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Additional resources for NFPA 70 - National Electrical Code - (USA)
2 General. 6. 184(A). 3 Connection to Grounded System. Premises wiring shall not be electrically connected to a supply system unless the latter contains, for any grounded conductor of the interior system, a corresponding conductor that is grounded. For the purpose of this section, electrically connected shall mean connected so as to be capable of carrying current, as distinguished from connection through electromagnetic induction. 6 Means of Identifying Grounded Conductors. (A) Sizes 6 AWG or Smaller.
2) Outdoor. Outdoor electrical equipment shall be installed in suitable enclosures and shall be protected from accidental contact by unauthorized personnel, or by vehicular traffic, or by accidental spillage or leakage from piping systems. 26(A). No architectural appurtenance or other equipment shall be located in this zone. 27 Guarding of Live Parts. (A) Live Parts Guarded Against Accidental Contact. Except as elsewhere required or permitted by this Code, live parts of electrical equipment operating at 50 volts or more shall be guarded against accidental contact by approved enclosures or by any of the following means: (1) By location in a room, vault, or similar enclosure that is accessible only to qualified persons.
A switch or circuit breaker that simultaneously opens all ungrounded conductors of the circuit shall be installed within sight of each transformer or motor location for disconnecting the transformer or motor. The switch or circuit breaker for a transformer shall have an ampere rating not less than the ampacity of the transformer supply conductors. The switch or circuit breaker for a motor shall comply with the applicable requirements of Article 430. 59 Enclosures. Enclosures for use in tunnels shall be dripproof, weatherproof, or submersible as required by the environmental conditions.