Heat Pump - Electrical Installation Step by Step | Cable, MCB, Diagram

A heat pump is one of the most power-hungry devices in a building. Wrong protection selection or cable sizing can lead to breaker trips, cable overheating, and even voiding the manufacturer's warranty. That's why heat pump connection must be done by a qualified person.

What Cable for a Heat Pump?

• For smaller units: 5×2.5mm².
• For larger or three-phase pumps: 5×4mm² or 5×6mm².
• The exact choice depends on power and cable length – always check the technical datasheet.

What Protection for a Heat Pump?

Most commonly used:

• MCB C16–C20 (C-characteristic for high starting current),
• Type A or Type B RCD – depending on manufacturer requirements,
• AC SPD – for surge protection of the equipment.

Why Is a Dedicated Circuit Essential?

A heat pump cannot share a circuit with other devices – washing machine, water heater, or electric boiler. Separate protection ensures stable operation and no power drops.

Connection Step by Step

1. Determine mounting location for indoor/outdoor unit.
2. Select cable according to power requirements.
3. Install dedicated circuit with RCD + MCB.
4. Complete earthing according to standards.

Well-done electrical work for a heat pump means savings, trouble-free operation, and maximum equipment lifespan.