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Level 17 of 33 · Electrical lab

Use the drawing to find a fault

Level 17 of 33 in the Electrical lab: a free panel wiring exercise at Advanced level. A starter will not start. Measure from the drawing, find the fault and mark it in red.

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Goal

The contactor does not pull in when START is pressed.

What you do

  1. When you know where the fault is, mark it in red on the drawing.

Done when

The level is marked automatically. It checks.

  • Questions answered by tapping the drawing
  • Every answer is marked on the drawing itself

Skills

  • Fault-finding
  • Measuring from a drawing
  • Redlining

Before you start

Level 16, Terminal plans and cable lists, comes first. Do it first if the ideas are new to you.

Start Use the drawing to find a faultSee all 33 levels

Free, in your browser, nothing to install. Your work is saved on this device. Updated 1 Nov 2026.

33 levels

Levels in the Electrical lab

Lock out, wire, test and fault-find a control panel, then prove it with a factory acceptance test.

Wiring basics

Levels 1 to 10
  1. Start Meet the bench and your meter
  2. Start One lamp, one switch
  3. Start Two-way switching: a stair light
  4. Start A socket on an RCD
  5. Start Contactor with start and stop
  6. Start Direct-on-line motor starter
  7. Start Forward and reverse with an interlock
  8. Start Star-delta with a timer
  9. Start Timers and relays
  10. Start Find the faults

Electrical drawings

Levels 11 to 23
  1. Start Symbols you will meet
  2. Start How a drawing set is organised
  3. Start Read a power circuit
  4. Start Read a control circuit
  5. Start Read a PLC input and output drawing
  6. Start Terminal plans and cable lists
  7. Start Use the drawing to find a fault
  8. Start Draw your first circuit
  9. Start Draw a direct-on-line starter
  10. Start Draw a forward and reverse starter
  11. Start Draw the PLC input and output sheet
  12. Start Draw the panel layout and parts list
  13. Start Build what you drew

Control panels

Levels 24 to 33
  1. Start Commission the transfer-pump starter
  2. Start Fault-find the outfeed conveyor starter
  3. Start Commission the star-delta fan starter
  4. Start Commission the reversing conveyor starter
  5. Start Commission the overhead tank pump (Hand/Off/Auto)
  6. Start Commission the sorting station sensors
  7. Start Commission the variable-speed infeed conveyor drive
  8. Start Commission the 4-20 mA level loop
  9. Start Commission the pneumatic pusher station
  10. Start Commission the packing cell (capstone)
Previous level 16Terminal plans and cable listsNext level 18Draw your first circuit

Part of the Electrical lab

Lock out, wire, test and fault-find a control panel, then prove it with a factory acceptance test.

Feeds these internships (training, not employment): Control Panel Design and Wiring, Commissioning and Maintenance, Instrumentation and Process Control.

About the Electrical lab

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