The water heater and electrical supply are properly grounded.

热水器和电源供应都有适当的接地。

I am making this call about problems with our electrical supply.

我是为本公司电气供应问题打电话来的。

How much of your country's electrical supply is derived from water power?

贵国的电力供应有多少是来源于水利发电？

A cycloconverter will be used to regulate the electrical supply to the equipment.

一个循环换流器将用于调节设备的电力供应。

The electrical supply has the proper overload fuse or circuit breaker protection.

电源供应具备适当的过载保险丝或断路器保护。