BC Hydro does not allow ANY Geocaches on poles or other electrical equipment.
From BC Hydro:
To ensure public safety and reliability of the electrical system, geocaches must not be placed or hidden on or near BC Hydro infrastructure or equipment such as poles, guy wire sleeves, pad mounted transformers and kiosks.
The location of geocaches in the vicinity of BC Hydro infrastructure or equipment may lead participants to open or tamper with containers or covers when trying to find or access geocaches. This is a dangerous practice that could result in injury if participants, members of the public or BC Hydro workers inadvertently come in contact with live electrical components. full article