Shielding for capactive current

Continuation of application No. 1 1/546,827, filed on Oct. 11, 2006, now Pat. No. 7,292,057, which is a continuation of application No. 10/626,903, filed on Jul. 25, 2003, now Pat. No. 7,138,813, which is a continuation of application No. 10/308,847, filed on Dec. 2, 2002, now Pat. No. 6,642,732, which is a continuation of application No. 10/179,771, filed on Jun. 24, 2002, now Pat. No. 6,512,391, which is a continuation of application No. 09/345,571, filed on Jun. 30, 1999, now Pat. No. 6,445,202. (63)