Even the old adage to use a 1 kV ceramic capacitor is not really correct.
Capacitors across the AC line carry current and AC-rated caps are designed to
carry whatever current will result from 120 VAC. The ceramic cap may work out,
but it is not really rated or designed for that use.
-----Original Message-----
From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> On Behalf Of Jim Brown
Sent: Wednesday, June 22, 2022 8:22 PM
To: rfi@contesting.com
Subject: Re: [RFI] LED recessed lighting
On 6/22/2022 4:51 PM, Scott Yost via RFI wrote:
> DO NOT USE an ordinary capacitor. Use only a properly rated safety capacitor.
Right.
> In my case I used a 0.0022 uF X2 275V metal film capacitor.
WRONG! Quoting from my tutorial on killing noise:
Use only type X1, X2, Y1 and Y2 capacitors, which are specifically rated for AC
line use and designed to withstand the 3-6 kV spikes that can occur on power
wiring. Choose this capacitor carefully – if it fails, it could catch on fire!
73, Jim K9YC
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