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