Substation and MCC lab · Level 3 of 8
Size a motor circuit
Level 3 of 8 in the Substation and MCC lab: a free substation and MCC exercise at Intermediate level. Choose the cable, the MCCB and the overload relay for a motor and check the voltage drop over the run.
Free · no download. Your work is saved on this device. Updated 18 Oct 2026.
The brief
- Client
- Westmere Aggregates
- Site
- Crusher line, MCC-2
- Work order
- WO-MCC-103
- Task code
- MCC-03
- Difficulty
- Intermediate
- Type of work
- Design
Choose the cable, the MCCB and the overload relay for a motor and check the voltage drop over the run.
Skills you practise
- Cable sizing
- Correction factors
- Voltage drop
- Motor circuit protection
What the test checks
The acceptance test marks the skills this level practises.
- Cable sizing
- Correction factors
- Voltage drop
- Motor circuit protection
In this lab
- Safe isolation: lock, tag, prove, test, earth
- Cables, breakers, relays and fault levels
- A 3D switchroom and transformer bay
Levels in the Substation and MCC lab
Previous: Safe isolation of an MCC bucketNext: Commission a star-delta starter
Part of the Substation and MCC lab
Walk a small substation, isolate a motor bucket safely, grade a relay and fault-find a motor control centre.
About the Substation and MCC lab
Feeds these internships: Control Panel Design and Wiring, Commissioning and Maintenance, Electrical Design.