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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 conductor bonding the metalwork and this is connected to a groundbed. The electrodes for electrical grounding are often called ''ground rods'' and are often made from steel with a copper clad surface – typically 1 to 2m long and in diameter. These are driven vertically into the ground and bonded together with bare copper wire.〔Electrical Engineer's Reference Book, Sixteenth edition by M. A. Laughton CEng., FIEE and D. J. Warne CEng., FIEE, Newnes, 2003, ISBN 0 7506 46373〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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