Alan Hilton (hiltona@tiw.com) wrote: : Actually the breakdown voltage of air would become greater as it thins. Isn't a vacuum a better : insulator than normal atmosphere? No, low pressure air ionizes more easily. I eventually found a 1984 spec MIL-STD-275E in our local university engineering library. It gives tables for conductor spacing both below 10000 feet and above. For example for voltages up to 100 volts, a spacing of .060" is required above 10000 feet, while only .025" is required below 10000 feet. -Bob Scott
Date: 11 Feb 1996 23:24:40 GMT
Original Subject: Re: Need PCB Design Rules for Avionics