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Update CT clamp docs (#19030)

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@ -19,18 +19,6 @@ If you want to split energy usage into multiple tariffs, [read this](/docs/energ
Home Assistant will need to know the amount of energy flowing through your meter. This data can be tracked in various ways. Home Assistant will need to know the amount of energy flowing through your meter. This data can be tracked in various ways.
### Using a CT clamp sensor
CT clamp sensors measure the instantaneous current passing through an electrical wire. To translate this into electrical power (W) you also need a voltage measurement, because Power = Current x Voltage.
In Home Assistant we have support for off-the-shelf CT clamp sensors and you can build your own with ESPHome's [CT Clamp Current sensor](https://esphome.io/components/sensor/ct_clamp.html). You can also use a dedicated energy meter sensor in ESPHome, which outputs more detailed data, like the [ATM90E32](https://esphome.io/components/sensor/atm90e32.html).
The off-the-shelf solution that we advise is the [Shelly EM](https://shop.shelly.cloud/shelly-em-2-x-120a-clamp-wifi-smart-home-automation?tracking=A7FsiPIfUWsFpnfKHa8SRyUYLXjr2hPq). The device has a local API, updates are pushed to Home Assistant and it has a high quality integration.
In case of three-phase electrical systems, attention should be drawn to the fact that the current measurement of a given phase is matched to the voltage of the same phase, otherwise the power measurements will be incorrect.
_Attention! Installing CT clamp sensor devices requires opening your electrical cabinet. This work should be done by someone familiar with electrical wiring. Your qualified installer will know how to do this._
### Connect to your meter ### Connect to your meter
The best way to get this data is directly from your electricity meter that sits between your house and the grid. In certain countries these meters contain standardized ways of reading out the information locally. The best way to get this data is directly from your electricity meter that sits between your house and the grid. In certain countries these meters contain standardized ways of reading out the information locally.
@ -57,6 +45,16 @@ We have developed [Home Assistant Glow](https://github.com/klaasnicolaas/home-as
![Photo of Home Assistant Glow attached to an electricity meter](/images/docs/energy/home-assistant-glow.jpg) ![Photo of Home Assistant Glow attached to an electricity meter](/images/docs/energy/home-assistant-glow.jpg)
### Using a CT clamp sensor
CT clamp sensors measure your energy usage by looking at the current passing through an electrical wire. This makes it possible to calculate the energy usage. In Home Assistant we have support for off-the-shelf CT clamp sensors and you can build your own.
The off-the-shelf solution that we advise is the [Shelly EM](https://shop.shelly.cloud/shelly-em-2-x-120a-clamp-wifi-smart-home-automation?tracking=A7FsiPIfUWsFpnfKHa8SRyUYLXjr2hPq). The device has a local API, updates are pushed to Home Assistant and it has a high quality integration.
You can build your own using ESPHome's [CT Clamp Current sensor](https://esphome.io/components/sensor/ct_clamp.html) or energy meter sensors like the [ATM90E32](https://esphome.io/components/sensor/atm90e32.html). For the DIY route, check out [this video by digiblur](https://www.youtube.com/watch?v=n2XZzciz0s4) to get started.
_Attention! Installing CT clamp sensor devices requires opening your electrical cabinet. This work should be done by someone familiar with electrical wiring. Your qualified installer will know how to do this._
### Data provided by your energy provider ### Data provided by your energy provider
Some energy providers will provide you real-time information about your usage and have this data integrated into Home Assistant. Some energy providers will provide you real-time information about your usage and have this data integrated into Home Assistant.