Pothead

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This article is about a type of high-voltage electrical terminal. For a person who regularly uses Cannabis ("pot"), see Cannabis smoking.
A three phase electric circuit terminated with a pothead
Crossarms with two three phase electric circuits terminated with potheads
Two three phase electric circuits in a residential neighborhood terminated with potheads

A pothead is a type of insulated electrical terminal used for transitioning between overhead line and underground high voltage cable or for connecting overhead wiring to equipment like transformers.[1] Its name comes from the process of potting or encapsulation of the conductors inside the terminal's insulating bushing.

Superseded[edit]

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 This standard was superseded by IEEE Std 48-1975 "IEEE Standard Test Procedures and Requirements for High-Voltage Alternating-Current Cable Terminations," and "pothead" was dropped from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 requirements:

  1. Electrical stress control
  2. Insulation between the conductors and ground
  3. An environmental seal

Alternatives[edit]

High voltage terminations conforming to IEEE Std 48-1990 and not requiring potting compound are illustrated below:

Transition of a 60kv powerline between overhead and underground 
Transition of a 4160 Volt powerline from overhead to underground 
Pothead for one phase 

See also[edit]

References[edit]

  1. ^ Herman, Stephen L. (2011). Electrical Wiring: Industrial (14th ed.). Cengage Learning. p. 21. ISBN 1-111-12489-2.