Electrical Systems & Wiring Flashcards

What is the primary function of a surge protector versus a UPS (Uninterruptible Power Supply)?

Answer: A surge protector absorbs voltage spikes; a UPS also provides battery backup during outages

A surge protector clamps excess voltage spikes, while a UPS adds a battery so connected equipment keeps running during a power outage.

Which NEC article specifically governs branch circuits?

Answer: Article 210

NEC Article 210 covers branch circuits, including ratings, required outlets, and the rules for various room types.

What is a 'dedicated circuit' and when is one typically required?

Answer: A circuit serving only one appliance, required for high-draw equipment like refrigerators or microwaves

A dedicated circuit has no other outlets or fixtures on it, ensuring large appliances like refrigerators or dishwashers get unshared power.

What does the color green or bare copper indicate for a conductor in US wiring?

Answer: Equipment grounding conductor

Green or bare copper conductors are equipment grounding conductors (EGC), providing a safe fault-current return path to prevent shock.

What is the effect of adding more resistance in a series circuit on total current?

Answer: Total current decreases

By Ohm's Law (I = V/R), increasing total resistance in a series circuit with a fixed voltage source decreases the total current.

Which device is used to measure the current flowing through a conductor without breaking the circuit?

Answer: Clamp meter (clamp-on ammeter)

A clamp meter measures current by sensing the magnetic field around a conductor, eliminating the need to open the circuit.

What is the maximum length of flexible cord permitted for a fixed appliance connection under NEC?

Answer: 6 feet

NEC generally limits flexible cord connections for fixed appliances to 6 feet to reduce wear risk and maintain a safe, manageable connection.