| 摘要 |
PURPOSE:To obtain a switchboard in which reliability is improved by preventing dew condensation in a box and holding humidity constant. CONSTITUTION:A dew condensation preventive device in a switchboard 1 outputs an electric signal due to deformation of a piezoelectric element 1 in response, when an adsorbent 4 absorbs moisture, to an increment in it, and operates a heater 8 to heat the adsorbent 4 if a controller 13 inputs the signal. Thus, the increased moisture is discharged by an exhaust blower 6 through an exhaust pipe 7. |
