A pothead is a type of insulated electrical terminal used for transitioning from overhead line to underground high voltage cable or for connecting overhead wiring to equipment like transformers. Its name comes from the process of potting or encapsulation of the conductors inside the terminal's insulating bushing.
Pothead was once defined in Institute of Electrical and Electronics Engineers (IEEE) Std 48-1962 "Standards for Potheads." This standard was superseded by IEEE Std 48-1975 "IEEE Standard Test Procedures and Requirements for High-Voltage Alternating-Current Cable Terminations," and "pothead" was dropped from usage. The current standard is IEEE Std 48-1990.
What was once called a pothead is now called a "Class I High-Voltage Cable Termination," which must meet these requirments:
- Electrical stress control
- Insulation between the conductors and ground
- An environmental seal
High voltage terminations conforming to IEEE Std 48-1990 and not requiring potting compound are illustrated below:
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