| 摘要 |
PROBLEM TO BE SOLVED: To make free of effects due to lighting current, caused indirectly by the electromagnetic inductance, etc., by enabling heavy current and signal wirings to be connected to arresters at an identical point for improving the workability and also for the arresters to be connected as close as possible to each electronic component. SOLUTION: Four arresters are built inside a box 10; a heavy current type S connected parallel to heavy current wiring 1A for a power line, etc., a first signal one Ta connected parallel to a signal wiring 1B for a communication lien, etc., a second signal one Tb connected in parallel to a signal wiring 1B for a communication line, etc., and a grounding one G connected to the grounding sides of the heavy current type S and signal ones T. |
