I'd take that question to the seller for an explanation. The filter may be intended to quiet a particular noisy device, like a PC. It only needs to be rated for the current drawn if it's on the customer side of the power outlet. Otherwise all our lamps would have to have #12 zip cord, and all extension cords would have to be #12. And fuses are not required in extension cords or lamp cords clearly unsafe with an actual 15 or 20 amps on it. 73, Guy.
On Thu, Jun 21, 2012 at 4:28 PM, DAVID CUTHBERT <[email protected]>wrote: > I don't like diff mode only filters because they have diff mode to common > mode conversion due to component tolerance. > > I don't see a fuse in the NQN filter and it us rated for only 7 amps. To > be used on a 20 amp circuit without an internal fuse it must be able to > handle 20 amps. I assume it's not UL listed? > > Dave WX7G > On Jun 21, 2012 1:07 PM, "Guy Olinger K2AV" <[email protected]> wrote: > >> On Thu, Jun 21, 2012 at 2:59 PM, DAVID CUTHBERT >> <[email protected]>wrote: >> >>> The W7NQN line filter is a differential-mode filter. You need a filter >>> that >>> is designed for common-mode filtering. >>> >>> Dave WX7G >> >> >> This is from the web page advertisement: >> --------- >> Compare this with a Brand "C" filter which only handles common-mode >> interference problems. The NQN AC power-line filters are optimized for >> common-mode and differential-mode filtering and have about 3 times the >> components of brand "C". >> --------- >> >> Seems to specifically include common mode. >> >> See http://arraysolutions.com/Products/nqnaclinefilter.htm >> >> 73, Guy. >> > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
