CAD CAD Specialist Electrical and Electronics Design 3

Question 1

What does a 'single-line diagram' (SLD) represent in power system electrical CAD?

Accepted Answer

A simplified topology diagram using one line to represent multi-phase conductors

Answer

A single-line diagram uses one line to represent all conductors (e.g., all three phases of a three-phase system) to show power system topology and protection coordination without drawing each wire.

Question 2

According to the National Electrical Code (NEC), what color identifies the equipment grounding conductor in US installations?

Accepted Answer

Green, green with yellow stripes, or bare copper

Answer

NEC Article 250 specifies that equipment grounding conductors must be green, green with yellow stripes, or bare (uninsulated) copper.

Question 3

In AutoCAD Electrical, what does the 'wire numbering' tool accomplish?

Accepted Answer

Assigns unique wire tags to nets for identification in panel wiring and field installation

Answer

Wire numbering assigns unique identifiers (wire tags) to electrical nets, enabling technicians to trace and verify individual wires by number during panel assembly and troubleshooting.

Question 4

What does a 'normally open' (NO) contact symbol indicate in an electrical wiring diagram?

Accepted Answer

The contact is open (no current flows) in its default de-energized state

Answer

A normally open contact is open — no current flows — when the controlling device (relay, contactor, pushbutton) is de-energized, and it closes to allow current when energized.

Question 5

What is the purpose of a 'from-to list' (wire list) generated by electrical CAD software?

Accepted Answer

Lists each wire connection by its start terminal and end terminal to guide panel wiring

Answer

A from-to list documents every electrical connection with its source terminal and destination terminal, giving panel builders a complete, actionable wiring roadmap.

(CAD) Certified Computer-Aided Design Specialist Practice Test

(CAD) Certified Computer-Aided Design Specialist Practice Test

CAD CAD Specialist Electrical and Electronics Design 3