Figure 4-9. - Three-phase 25 kVA transformers mounted on an H-frame platform.

If there are no ground connections, the primary Great danger will exist for everyone touching any voltage will be impressed upon the secondary electrical equipment at this time.

conductors, which are usually, insulated for 600 volts, Ground resistance must not exceed 25 ohms to and considerable damage to the equipment will occur. ground. This resistance can be measured with various