Lyle E. McBride

Characterization of metals as EMC shields

The authors describe a test fixture and method used for about five years to characterize the shielding performance of both monometallic and composite sheets, over a frequency range of 50 Hz-300 kHz, with effectiveness values up to 90 dB. Calculation methods were developed to permit extrapolation of the test results to different geometries and wave impedance; data are presented showing the correlation with more difficult tests. The procedure could be made a standard test method capable of providing all the information needed for the selection of an economical and effective metal shield under a variety of field conditions.

Corrosion Evaluation of Steel Clad Copper Concentric Neutrals

Corrosion of bare and tin alloy coated copper concentric neutral strands in underground distribution cable has received much attention in recent years. Although disagreement still exists on the extent of the problem and the mechanisms that cause it, a number of mitigative techniques are being evaluated.