The DIY way of providing an well isolated power supply would be a small solar cell and a bank of high intensity LED lights. On Mon, May 18, 2015 at 12:19 AM, embedded systems wro= te: > I forgot, in one of my last designs I used with success the ADUM isopowe= r > at 5KV isolation (very expensive as I mentioned before) > http://www.analog.com/en/products/interface-isolation/isolation/isopower.= html#isopower > > > On Sun, May 17, 2015 at 12:50 PM, embedded systems > wrote: > >> Harold, >> opto couplers are a good idea up to 10KV isolation. Isolated supply at >> 10KV it's usually expensive but up to 1KV it's easy to find: >> >> http://www.newark.com/recom-power/roe-0505s/dc-dc-converter-1w-5v-0-2a-s= ip/dp/63X9545 >> Buried cable is less susceptible to lighting. I will not be extremely >> worried but depends what do you have at the end. >> >> Vasile >> >> >> On Sat, May 16, 2015 at 8:39 PM, Harold Hallikainen < >> harold@hallikainen.org> wrote: >> >>> I'm working on an application where contact closures will be sensed by = a >>> PIC inside a building, but the contacts are outside (perhaps tens of >>> meters away). What sort of protection for the inputs is suggested? What >>> sort of protection is required by regulatory standards for equipment >>> connecting to outside wiring? The outside wiring would likely be buried= , >>> but lightning could still induce currents into buried cables. Opto >>> couplers are one way to get the isolation, but then you have to power t= he >>> LEDs with an isolated supply. Ideas? >>> >>> Thanks! >>> >>> Harold >>> >>> >>> >>> -- >>> FCC Rules Updated Daily at http://www.hallikainen.com - Advertising >>> opportunities available! >>> Not sent from an iPhone. >>> -- >>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >>> View/change your membership options at >>> http://mailman.mit.edu/mailman/listinfo/piclist >>> >> >> > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 Jason White --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .