I'm building a front end for a data logging project where I need to measure the voltage of a solar PV string. The max voltage I want to design for is 600V.
My question is: when choosing resistors R1 and R2 (see schematic below), do I need both of them to be rated for 600V? In other words, do I design for the scenario where the connection between R2 and GND is broken, thus exposing R2 to 600V (since no current flow through R2 means that there is no voltage dropped by R1).
The problem is that the only through-hole 10k resistors I can find that meet the voltage requirements are only accurate to within +/-5%, which makes them pretty useless for use in an ADC voltage divider. See search results on element14.