Dangane da ƙayyadaddun ƙayyadaddun ƙofofin wuta, kowace ƙofar wuta tana da tambarin shaidarta, wanda shine katin shaidar lantarki na ƙofar wuta. Masu kera ƙofofin wuta ya kamata su sanya alamar kowace kofa gaba ɗaya lokacin da samfurin ya bar masana’anta, kuma wasu masu amfani da suka sayi ƙofofin wuta na katako na iya yin fenti ko liƙa fafunan ado a kan alamun ƙofar daga baya.

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