Hey electrical champs! 👷‍♂️
In today’s post, I’m sharing a complete step-by-step guide to designing a DOL (Direct On Line) Starter for a 1 HP Motor using AutoCAD Electrical.

Whether you're a student, working professional, or just someone exploring panel wiring, this is a must-know project that combines theory with practical design.

🧠 What is a DOL Starter?

A DOL Starter is the simplest way to start a 3-phase induction motor. It directly connects the motor to the full line voltage using a contactor, MCB, overload relay, and push buttons.

⚙️ Components Used:

  • MCB – 6A, 3-Pole

  • Contactor – 9A, 3-Pole with 230V coil

  • Overload Relay (OLR) – 1.5–2.5A adjustable range

  • Push Buttons – Green (Start, NO), Red (Stop, NC)

  • Cable – 2.5 sq.mm for all phases

  • Control Supply – 1 Phase + Neutral for the contactor coil

🖥️ What I Did in AutoCAD Electrical:

✅ Created the power diagram using standard IEC symbols
✅ Added terminal numbers and pin data using the Edit Component tool
✅ Properly routed L1, L2, L3, and Neutral (not L4 😄)
✅ Labeled wire connections and added cable size info
✅ Assigned correct ratings to every component for a 1 HP motor

💡 Pro Tips:

  • Always use 2.5 sq.mm cable for safety and durability.

  • Use A1 and A2 for coil terminals (A1 to phase, A2 to neutral).

  • Never label neutral as L4 — keep it as N for clarity and standards!

📽️ Watch the Full Tutorial

👉 EASY ELECTRA
Go watch the video and follow along with the AutoCAD drawing step by step.

📚 Learn More with Easy Electra

If you enjoy practical electrical projects like this, don’t forget to subscribe to my YouTube channel — Easy Electra! I regularly post tutorials on PLC, SCADA, AutoCAD, Factory IO, and industrial automation.

Let me know in the comments if you want the control circuit next! 😊