Be careful of this practice. For products that are subjected to line induced susceptibility signals (e.g. anything going to Europe!), the use of an inductor in PE can be a problem. Consider for example, the application of electrical fast transients. These bursts are applied, among other things, from line to PE. With an inductor in series, significant voltages are developed, creating a very nice radiating element inside your product.
You may be able to use this technique, depending on your design, but you are generally better off attacking the source of the internal noise. Regards; Bob Martin, PE, NCE Sr. Technical Manager ITS - Northeast [email protected] ---------- From: rlanz To: [email protected] Subject: RF choke in protective earth List-Post: [email protected] Date: Friday, February 27, 1998 9:55AM Good Morning. Seeking opinions on use of RF choke in protective earth. Due to invertor circuitry, rf noise is tripping GFCI. Series coil in P.E. appears to solve problem. RF coil will not effect 10-25 A PE safety test done at 60 Hz. Also coil shall be equivalent to AWG of PE conductor to pass equivalent ground fault circuitry. Nevertheless, it is disconcerting to place a series component in the Protective earth conductor. Comments are appreciated. Thank You Rich Lanzillotto [email protected]
