The defendant's appeal and the plaintiffs' incidental appeal are dismissed, respectively.

Expenses for appeal shall be borne by the defendant and incidental costs for appeal.

Basic Facts

A. The Plaintiffs operate the sports center under the trade name “D” in the Yeongdeungpo-gu Seoul Metropolitan Government Building C (hereinafter “instant building”). The Defendant supplied electricity to the instant building, etc. through the underground wires, which begin at the brigade transformation station under the Electric Utility Act, as an electricity supplier operating the electric transmission business, etc.

B. The E Co., Ltd. (hereinafter “E”) ordered “G Construction” located in Seoul F from the Yeongdeungpo-gu Seoul Metropolitan Government, and performed construction work on November 14, 2017, when an engineer of the E, 08:56, on November 14, 2017, was laid underground.

H In the event of destruction of underground wires to the ground of the instant building and the interruption of electricity supply to the whole premises of the neighboring buildings, such as the instant building (hereinafter referred to as “the first generation accident”). C.

After the occurrence of the first power failure, the Defendant is engaged in physical operation (in operating the opening and closing machine to accurately verify the upper section, and the supply of electricity to the sections without any breakdown, to minimize the front section by resumption) in order to restore the supply of electricity. On the same day, around 08:59, the section 1 (hereinafter “section 1”) described in the drawing below is separate from the estimated broken section. From around three times until around 09:32, the opening and closing machine is closed and the experimental transmission is finished, the Defendant separated from the estimated broken section 2 (hereinafter “section 2”) described in the same drawing from the estimated broken section; around 09:55, the point of breakdown is specified as H building among the section 3 (hereinafter “section 3”).

(d)

In the process of separating Section 2 as above, there was a situation in which the supply of electricity was suspended for 1 minute each time within 1 hour from the time of the occurrence of the first electric accident (hereinafter “the second electric accident”) and the supply was resumed (hereinafter “the second electric accident”), and the machine established in the sports center operated by the plaintiffs and the machine of learning.