A slack chamber in a form which will extendably retain a loop of service cable ready to pay out slack in the event of ground subsidence is provided buried either in line with an underground cable run or partially buried in line with the service line from the building service downwardly to an underground...http://www.google.de/patents/US7394023?utm_source=gb-gplus-sharePatent US7394023 - Slack cable arrangement for underground electric service conduit connected to service boxes on the sides of buildings
