
1) Electric power
Found on
https://www.crosswordclues.com/clue/groundbed

A groundbed is an array of electrodes, installed in the ground to provide a low resistance electrical path to ground or earth. A groundbed is a component in an earthing system. Each electrode is called a ground rod or a earth electrode. ==Grounding systems== For building electrical grounding systems or earthing systems there is a low resistance co...
Found on
http://en.wikipedia.org/wiki/Groundbed

A buried item, such as junk steel or graphite rods, that serves as the anode for the cathodic protection of pipelines or other buried structures. See also deep groundbed.
Found on
http://www.encyclo.co.uk/local/20742

A buried item, such as junk steel or graphite rods, that serves as the anode for the cathodic protection of pipelines or other buried structures. See also deep groundbed
Found on
http://www.encyclo.co.uk/local/21115
No exact match found.