ELECTRICAL CODE TRADE REFERENCE

Transcription

1 ELECTRICAL CODE TRADE REFERENCE FIFTH EDITION By Marvin Rosenberg

2 UNIT 2: CODE COMPONENTS General Rule Sections 0 Definitions accurate interpretation 2 General Rules administrative and technical requirements rules that do not have their own section Module 1 4 Conductors practical application of theory for all conductors including flexible cord and portable power cable 6 Services and service equipment consumer s services and equipment 8 Circuit loading and demand factors application of all circuit design ratings 10 Grounding and bonding systems, connections, methods, electrodes, conductors 12 Wiring methods hands-on work - conductors 14 Protection and control protect circuits, equipment, and personnel 16 Class 1 and Class 2 circuits circuits found in motor control, alarms, doorbells, power supplies, and other such equipment 3

3 UNIT 3: MARKING, SYMBOLS AND RULE SYSTEM Marking convention for the Ontario Electrical Safety Code is listed in the Preface Ontario revision printed in italic script just before the Canadian Electrical Code Rule it modifies A change from the previous Code Symbols for SI units, multiplying factors for conversion to previously used units, the metric trade designator for conduit follows after the Preface Rule numbering system is located under General arrangement (1)(a)(i)(A) Prior to 2006 version example 2012 version example 8-202(1)(a)(i)(A) 8-202(1)(a)(i)(A) Rule Rule (1) Subrule (1) Subrule (a) Paragraph (a) Item (i) Subparagraph (i) Item (A) Clause (A) Item 12

4 UNIT 4: SECTION 0 DEFINITIONS Ontario Revision Section O Object and Scope are deleted Code definitions maintain industry standards for correct interpretation of technical terms. Low voltage means exceeding 30 but not exceeding 750 V inclusive EMT is tubing not conduit National Building Code of Canada means Ontario Building Code Requirements of the Supply Authority means the Supply Authority s own requirements not the Ontario Electrical Safety Code Module 1 Specific definitions can be found in the more specific supplementary or amendatory sections of the Code. Locked rotor current rating Section 28 Touch voltage Section 36 13

5 MODULE 2 UNIT 1: SECTION 2 GENERAL RULES Scope Rule The Code does not apply to installations: intended to sell or distribute power to the public, used for communication purposes, or for railways, aircraft, mines, marine vessels, automobiles Module 2 Inspection Rule application must be filed before or within 48 hours of starting work see contractors responsible for electrical installations, must make sure it complies with the Code connection authorization issued even though all portions of the installation have not been inspected Periodic inspection Rule routine electrical work in a premise can be inspected within a customer designated time period Refusal to inspect Rule may be refused due to previous non-compliance with Code 15

6 UNIT 3: SECTION 4 CONDUCTORS Ampacity, use and correction factors of wire and cables Rule Tables 1, 2, 3, and 4 do not take voltage drop into consideration for voltage drop see Tables D3 and D4 true neutral not to be counted in determining ampacities identified white wire to be counted in determining ampacities neutral supported cable ampacities listed in Table 36A and 36B bonding conductor not to be counted in determining ampacities correction factors apply only to power and lighting, not to control conductors or auxiliary gutters Table 5A correction factors for ambient exceeding 30 C Table 5B correction factor for free air rating conductors run in contact for up to 4 conductors and Tables 2 or 4 for more than 4 in contact Table 5C for multi-conductor cables run in contact for more than 600 mm lowest temperature rating applies where conductors in same raceway have different ratings lower ampacity applies for underground to above ground transition exception (17) higher ampacity applies for 4 conductors or less and length is maximum 3 m or 10% of run, whichever is less 22

7 Eliminate the effects of magnetic fields and circulating currents A and greater use one cable diameter minimum spacing between conductors one non-magnetic plate at supply side and one insulating fibre plate at load side use non-magnetic sheathed conductors, connectors, locknuts, bushings and clips ground cable sheaths at supply end and maintain isolation of cables from ground and each other install separate bonding conductor from supply enclosure to load enclosure at service entrance non-magnetic ground bushings required as per (1)(b)(ii) Rules (2), , (8), , Table 16, (5), in Appendix B, (3), (7) Module 2 Flexible cord uses Rule Table 11 identifies specific conditions of use for: portable equipment, pendants, cranes, hoists, components between which facilitates relative motion, ranges, dryers, data processing systems, prevention of noise and vibration Flexible cord cannot be used: as a substitute for permanent wiring at temperatures above or below its ratings when permanently attached 25

8 Identified conductor use Rule techniques for identifying or de-identifying the identified conductor in manufactured cables and field wiring procedures Portable power cable uses Rule similar but not the same as flexible cord and should not be confused Cable labeling and markings Test Conditions Module 2 Insulation Voltage Rating Insulation Temperature Rating WOODS 9/23/O3 LL90458 CSA AWG 14 CU 2CDRS NMD90 NYLON -35 C 300 VOLTS FT1 CSA Type Designation Number of insulated conductors Conductor size Conductor material Certification Organization and file number Manufacturer s Name and date 27