[RFI] LED recessed lighting

[Hare, Ed, W1RFI]

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 at contesting.com> On Behalf Of Jim Brown
Sent: Wednesday, June 22, 2022 8:22 PM
To: rfi at 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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