![Do I have a high voltage system? The black and white wires are thicker. I couldn't find any other indication that it is high voltage. Just trying to add a smart thermostat. : Do I have a high voltage system? The black and white wires are thicker. I couldn't find any other indication that it is high voltage. Just trying to add a smart thermostat. :](https://preview.redd.it/do-i-have-a-high-voltage-system-the-black-and-white-wires-v0-ab78rdsfeb9a1.jpg?width=640&crop=smart&auto=webp&s=23cf8996ccb0a93b525c5e490bacdca0b7677f64)
Do I have a high voltage system? The black and white wires are thicker. I couldn't find any other indication that it is high voltage. Just trying to add a smart thermostat. :
![high voltage 220v nest thermostat wiring in europe thru RC840 from Aube matt 2013_rev2_20130111 | using nest thermostat in Europe... (on a 220V system) high voltage 220v nest thermostat wiring in europe thru RC840 from Aube matt 2013_rev2_20130111 | using nest thermostat in Europe... (on a 220V system)](https://usingnestthermostatineurope.files.wordpress.com/2013/01/high-voltage-220v-nest-thermostat-wiring-in-europe-thru-rc840-from-aube-matt-2013_rev2_20130111.jpg)
high voltage 220v nest thermostat wiring in europe thru RC840 from Aube matt 2013_rev2_20130111 | using nest thermostat in Europe... (on a 220V system)
![4500W Smart Thermostat, High Power Energy Saving Smart Button Digital Temperature Controller Widely Used Stable Reliable for Home Office Market Hotel AC90V to 240V (White) : Amazon.co.uk: Home & Kitchen 4500W Smart Thermostat, High Power Energy Saving Smart Button Digital Temperature Controller Widely Used Stable Reliable for Home Office Market Hotel AC90V to 240V (White) : Amazon.co.uk: Home & Kitchen](https://m.media-amazon.com/images/I/51U5w2B+ILL._AC_UF894,1000_QL80_.jpg)
4500W Smart Thermostat, High Power Energy Saving Smart Button Digital Temperature Controller Widely Used Stable Reliable for Home Office Market Hotel AC90V to 240V (White) : Amazon.co.uk: Home & Kitchen
![nVent Home Programmable Dual-Voltage Thermostat with Touchscreen, Floor Heating Abilities - Amazon.com nVent Home Programmable Dual-Voltage Thermostat with Touchscreen, Floor Heating Abilities - Amazon.com](https://images-na.ssl-images-amazon.com/images/I/513-v2Tg+tL._AC_UL600_SR600,600_.jpg)