Technical information

Contents

Introduction to North American Standards

1. Comparison between two cultures and markets: The United States and

the European Union. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.1 Different juridical approaches: how are "safety" and "security"

implemented . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.2 Market control systems and Control bodies . . . . . . . . . . . . . . . . 8

1.3 The role of the AHJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.4 Obligations of machinery manufacturers . . . . . . . . . . . . . . . . . 9

2. Historical evolution of the North American regulations . . . . . . . . . . . 10

2.1 Certification authorities . . . . . . . . . . . . . . . . . . . . . . . . . 13

3. Main reference texts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1 Component certification . . . . . . . . . . . . . . . . . . . . . . . . . 16

4. Machinery and plant certification in the USA . . . . . . . . . . . . . . . . 17

Feeder and Branch Circuits

1. Switching and protection of the electrical equipment . . . . . . . . . . . . 18

1.1 The different types of circuit . . . . . . . . . . . . . . . . . . . . . . . 18

1.2 Power circuits and control circuits. . . . . . . . . . . . . . . . . . . . 19

2. The switching device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2.1 Sizing the switch in accordance to UL 508 . . . . . . . . . . . . . . . 21

2.2 Sizing according to the CEC for the Canadian market . . . . . . . . . . 23

2.3 Sizing in accordance with the NEC . . . . . . . . . . . . . . . . . . . 23

2.4 Conforming components that can be used for switching . . . . . . . . 24

2.5 Components that cannot be used for switching . . . . . . . . . . . . . 24

2.6 Components accepted with restrictions . . . . . . . . . . . . . . . . . 25

3. Feeder overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . 26

3.1 How to protect the electrical equipment from over currents . . . . . . 28

4. Internal wire.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.1 Distribution mounts, Power Block. . . . . . . . . . . . . . . . . . . . 30

4.2 Sizing of the Feeding Conductor . . . . . . . . . . . . . . . . . . . . . 31

4.3 Reduction of the cross-sections downline from the feeder conductors. 32

5. Sockets and plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6. Fuses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6.1 Class CC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.2 Class J. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.3 Class K, RK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

TABLE OF CONTENTS