Based on the 2008 NEC
National Electrical Code Articles and Information
National Electrical Code Top Ten Tips:
Article 522 -- Control Systems for Permanent Amusement Attractions
- Article 522 applies to control circuit power sources and conductors for permanent amusement attractions.
- A control circuit carries the electrical signals for controlling the equipment, but does not carry the power [522.2]. Example: The 120V motor speed control and start/stop circuits belong to the controls, the 480V power to the motor itself does not.
- What does the NEC mean by "permanent?" For Article 522, it means that transporting or relocating the equipment is impractical [522.2]. That does not mean it's impossible. Basically, if you don't typically remove the equipment at the end of the season (or during), it's permanently installed.
- Only "qualified personnel" can service this equipment [522.7]. An untrained operator with a pair of pliers isn't a qualified person. A factory-trained technician with specific training on this specific equipment is.
- The two types of control circuits are power-limited (under 30V and under 1,000A) and non power-limited. The latter cannot exceed 300V [522.10].
- The overcurrent protection devices for power-limited control circuits can't be rated for more than 167% of the following: VA rating divided by the rated voltage [522.10].
- You can't use aluminum conductors in the control circuits [522.20].
- If using conductors 16AWG or smaller, ensure they comply with Table 522.22.
- Though it's a poor engineering decision, you can run control and power wiring in the same raceway. But to do so you must meet the criteria of 522.24(B).
- Where wet contact is likely to occur, ungrounded 2-wire control circuits are limited to 30VDC (or 12.4VDC peak for DC that's continually interrupted at a rate of 10 to 200 Hz) [522.28].
We work closely with Mike Holt. If you want to
boost your Code competence dramatically, check out the Holt
courses and guides we offer. These are well-researched and noted for their
accuracy and clarity. Go with the best, so you can be one of the best.
Don't take your
electrical exam twice
Journeyman Electrical Exam Prep | Master Electrician Exam Prep
Learn more about:
How the NEC is arranged
- The first four Chapters of the NEC apply to all installations.
- Article 90 precedes Chapter One, and establishes the authority of the NEC.
- Article 80 follows the body of the NEC; it exists as Annex H. It provides the requirements for administration.
- Chapters 5, 6, and 7 are the "special" chapters, covering special: occupancies, equipment, and conditions (in that order).
- Chapter 8 provides the requirements for communications systems.
- Chapter 9 provides tables.
- The appendices provide mostly reference information.
- Appendix D contains examples that every NEC user should study.
Try your NEC moxy:
- Do you know the difference between bonding and grounding? Hint: Look in the NEC, Article 100.
- Does the NEC refer to grounding incorrectly in any of its articles? Yes! So be careful to apply the Article 100 definitions. Don't ground where you should bond.
- When doing motor load calculations, which Article covers hermetic motors? Answer: While Article 440 covers the application of hermetic motors, it does so only by amending Article 430 because hermetic motors are a special case of motors. For motor load calculations, refer to Article 430.
- Does the NEC provide a voltage drop requirement? Yes! It does so in a special case, which is Article 648 Sensitive Electronic Equipment. But for general applications, it does not provide a requirement; it merely provides a recommendation in a couple of FPNs.
- Take our Code Quizzes.
Remember other applicable codes, rules, standards, and references:
- OSHA's electrical worker safety rules.
- IEEE standards.
- NETA standards.
- NFPA standards.
- International Codes (if applicable to the installation).
- State Codes (if the state has them).
- Local ordinances and permit requirements.
- Local fire codes.
- Manufacturer requirements or guidelines.
- Customer security requirements.
- Industry standards.
- Your company's own internal standards, practices, and procedures.
- Engineering drawing notes.