Recently purchased an IotaWatt and a SCT013 to monitor my home incoming mains lead, everything is working great. Expanding upon this, I purchased a number of SCT006s from YHDC to monitor internal home circuits. These CT sensors were delivered with bare cables so I’ll need to extend these and attach a 3.5mm jack for the IoTaWatt.
As per Extending the Current Transformer Cable article a screened twin core microphone cable will be used to extend.
It appears the SCT006 white wire labeled as ‘k’ is connected to the 3.5mm jack “Tip” and the SCT006 red wire labeled as ‘l’ is connected to the 3.5mm jack “Sleeve”. The above article also mentions the requirement to connect the extending microphone cable screen to earth at one end only, however pictures in the blog entry Question regarding precision of CTs (SCT006) show no indication of earthing the cable screen. Could someone please clarify weather earthing is required and if so were?