Electrical drawings practice test
20 mixed questions from every electrical lesson. Pick your system, then work through them.
Same drawing, question 1 of 5
The motor is stopped. Which lamp is lit?
What this test covers
Each question comes from one of these lessons. If a topic trips you up, go back to that lesson for more practice.
- Electrical symbols: Contacts, pushbuttons, coils, lamps, motors and basic components, in US (ANSI/IEEE) and IEC style.
- Contacts and control logic: Normally open and normally closed, series and parallel: work out when a lamp lights.
- Device tags: CR, PB, OL, LS on US drawings; -K, -S, -F, -M on IEC drawings.
- Wire colors: Neutral, ground and hot conductors under the NEC, and the IEC 60445 colours used in Europe.
- Wire sizes: AWG and mm²: Why a higher gauge number is a thinner wire, and how AWG sizes compare with metric cable sizes.
- Read a motor control circuit: A start/stop circuit with a seal-in contact, overload and pilot lamps. Five questions per drawing.
Explained in our own words and checked against several references. For the full rules, see the NEC (NFPA 70), NFPA 79, IEC 60617, IEC 60445 and IEC 81346-2. Your drawing legend always comes first.