求翻译：质保期应从低压开关柜安装测试完毕且技术指标验收合格，合格证书签发之日算起计算，至少为三年。是什么意思？

Warranty period shall complete installation and testing of low voltage switchgear and acceptance specifications, the date of issue of certificate of calculation, at least three years.

The warranty period shall be from low-voltage switchgear installation finished testing and technical indicators, acceptance certificate of competency issued date calculation, at least for a period of 3 years.

The nature guarantees the time to be supposed to finish also the technical specification approval from the low pressure switch cabinet installment test is qualified, date of the certificate of quality signing and issuing calculated calculates, is three years at least.

The warranty should be removed from the low-voltage switch cabinet installation testing is completed and specification acceptance, certificate issued from the date of calculation, at least three years.

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