Q: Should smart home devices be on their own circuit?

For a modest load it can share a general circuit, but a dedicated radial for network and security infrastructure is good practice — it isolates the kit from other faults and lets you label and protect it properly. The calculator suggests a cable and MCB size.

Question 1

How much electrical load does a smart home add?

Accepted Answer

Surprisingly little — most smart devices draw a few watts each. A well-equipped home with cameras, access points, hubs and a NAS is often under 300–500 W total, comfortably within a normal circuit. The calculator totals the active and standby load and recommends a circuit.

Question 2

What is a PoE power budget?

Accepted Answer

Power over Ethernet devices (cameras, access points, PoE lights) draw their power from the network switch. The PoE budget is the total wattage of all PoE devices — the switch must supply at least that, with around 20% headroom. The calculator sums it and suggests a switch size.

Question 3

Do I need a UPS for a smart home?

Accepted Answer

A UPS keeps the network, hubs and security kit running through short outages — worth it for cameras, alarms and a NAS. Size it from the active load with a margin: the calculator gives a VA rating and battery Ah for your chosen backup time.

Question 4

Should smart home devices be on their own circuit?

Accepted Answer

For a modest load it can share a general circuit, but a dedicated radial for network and security infrastructure is good practice — it isolates the kit from other faults and lets you label and protect it properly. The calculator suggests a cable and MCB size.

Smart Home Load Calculator