EH Rated Boots: What's the number?

I found this online. Did the voltage change?

What it does: EH-rated boots provide secondary protection against accidental contact with an
open electrical circuit. The soles and heels are made of non-conductive materials that resist
electrical current under dry conditions. Under ASTM F2413 testing, the sole assembly must
withstand 18,000 volts for one minute with no current flow exceeding 1 milliamp.