In electricity supply design, a ring circuit is an electrical wiring technique in which sockets and the distribution point are connected in a ring. It is contrasted with the usual radial circuit, in which sockets and the distribution point are connected in a line with the distribution point at one end.

Ring circuits are common in the UK and the flow of electricity on a ring circuit will be proportionally split between each leg based on the resistance of each path. That's why you will can see different values from each leg of the ring circuit.

Since we have two lines leaving the breaker (or more), to monitor ring circuits correctly, we recommend adding a 50A CT to each and all of those lines coming out of the ring as it splits into two respective directions (so that you're not monitoring half of the ring).

Despite being a bit limited due to the physics of how those circuits work, you'll want to keep a sensor on each line you want to monitor, to guarantee correct measurements for the entire circuit.

Using a single sensor around both wires will cause issues, as the different currents will cancel each other out through that sensor.

Multipliers in ring circuits

A ring circuit behaves almost like a "split phase" circuit in the way they can have different usage on each phase, so multipliers wouldn't work in this situation and neither would combining both lines through a single sensor.

When monitoring the ring circuit, since you have a sensor in each leg, you don't need any multipliers on the Emporia app for that circuit, the multiplier should be 1.0 (one).

Not monitoring ring circuits
If you decide to not monitor the ring circuits, that circuits' usage will show up in the balance.