The per-group meters use current transformers (CTs) to measure current. Choosing the right CT is a trade-off between physical size and measurement accuracy.

Requirements

The current transformer must have a 1A or 5A output. We typically use split-core (clip-on) CTs, which can be fitted around an existing conductor without disconnecting it.

Recommended models

Model	Ratio	Burden	Accuracy class	Best for
ELEQ TQ30	100/1A	0.2 VA	Class 3	Tight spaces — smaller dimensions
ELEQ TQ40-B	100/1A	0.2 VA	Class 1	Higher accuracy — measurement within 1%

• Choose the TQ40-B when accuracy matters most; its Class 1 rating is well suited to accurate kWh measurement (within 1%).
• Choose the TQ30 when space is limited; its main advantage is its smaller size.

Installation

Both models are designed for connection to digital metering systems and are supplied with colour-coded leads.

• A correct, closed fit is confirmed by a clearly audible "click".
• Two tie-wraps are supplied with each CT for easy mounting around the primary conductor.