lead-in insulator

lead-in insulator

[′lēd‚in ′in·sə‚lād·ər]
(electricity)
A tubular insulator inserted in a hole drilled through a wall, through which the lead-in wire can be brought into a building.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.