periodical maintenance meaning in English

定期维护
定期维修
定期养护

Where the power supplier needs to suspend power supply due to reasons such as periodical maintenance or provisional maintenance of the power supply facilities , legally required power rationing , or illegal use of power by the power customer , etc . , it shall notify the power customer in advance in accordance with the relevant stipulations of the state
第一百八十条供电人因供电设施计划检修、临时检修、依法限电或者用电人违法用电等原因，需要中断供电时，应当按照国家有关规定事先通知用电人。