A pole with how many transformers is a good indicator of three-phase power use?

A pole with how many transformers is a good indicator of three-phase power use?

• A. Two transformers
• B. Three transformers
• C. Four transformers
• D. Five transformers

Answer: (B)

Three-phase power is distributed using three separate phase voltages, offset from one another by 120 degrees. A common and clear way utilities do this is to mount one transformer for each phase on the same pole, forming a three-transformer bank. So, when you see three transformers on a single pole, that visual setup is a strong indicator that the line is carrying three-phase power, since each transformer is handling one of the three phases. If you see only two transformers on a pole, that usually points to a single-phase setup or a subset of services rather than a full three-phase bank. Seeing four or five transformers on one pole is not the standard arrangement for indicating three-phase distribution, so it’s less reliable as a cue for three-phase power.

Three-phase power is distributed using three separate phase voltages, offset from one another by 120 degrees. A common and clear way utilities do this is to mount one transformer for each phase on the same pole, forming a three-transformer bank. So, when you see three transformers on a single pole, that visual setup is a strong indicator that the line is carrying three-phase power, since each transformer is handling one of the three phases.

If you see only two transformers on a pole, that usually points to a single-phase setup or a subset of services rather than a full three-phase bank. Seeing four or five transformers on one pole is not the standard arrangement for indicating three-phase distribution, so it’s less reliable as a cue for three-phase power.