Description
Current transformers (CTs) are sensors that are used for measuring alternating current. They are particularly used for measuring whole building electricity consumption (or generation for that matter).
The split core type such as the CT in the picture above, is particularly suitable for DIY. It can be clipped straight on to either the live or neutral wire coming into a building without having any high voltage electrical work.
 
Specifications 
Core Material: Ferrit
External Material: Plastic
Input Current:0A-100A
Output Current:0-50mA
Opening Size:13 x 13mm
Output Plug:3.5mm
Dielectric Strength:6000V AC/1min
Working Temperature:-25-70°C
Cable Length:1.0m
Anti-flaming rate:UL94-V0
Mechanical strength:>500(20°C)
Resources:
1. Current Meter, Network Frequency and Non-invasive Power
2. NON-INVASIVE SENSOR: YHDC SCT013-000 CT USED WITH ARDUINO
3. Current Transformer Conditioner