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Xringer · 11-16-12, 08:56 AM

If it's RFI you're worried about, it's not normally a problem with underground cables.
RF noise or radio transmissions in the AM band and higher, don't penetrate more than a few inches into the ground.

For the section of wire that's exposed to the RF environment in your basement,
(if it's not twisted pair) a simple ferrite clamp-on filter should work fine.
Ten TDK 5mm Clip on EMI RFI Filter Snap Around Ferrite New | eBay
The old CRT monitor cables had them installed..

Anyways, if you have some extra wire, I would think about having an extra pair,
for a few watts of PV that you might want to add later on.

11-16-12, 08:56 AM	#113
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	If it's RFI you're worried about, it's not normally a problem with underground cables. RF noise or radio transmissions in the AM band and higher, don't penetrate more than a few inches into the ground. For the section of wire that's exposed to the RF environment in your basement, (if it's not twisted pair) a simple ferrite clamp-on filter should work fine. Ten TDK 5mm Clip on EMI RFI Filter Snap Around Ferrite New \| eBay The old CRT monitor cables had them installed.. Anyways, if you have some extra wire, I would think about having an extra pair, for a few watts of PV that you might want to add later on. __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less..