French to English Tech/Engineering Electronics / Elect Eng testing

This document outlines functional and safety tests to be carried out on the handpiece of a medical device.

A number of these tests are electrical checks, including the "test haute tension phase-terre", which I have translated as "line-to-ground high-voltage test" (in accordance with IEC's preference for "line" as opposed to "phase" in English*).

In a later mention of this test, is it safe to use "line" to translate the French "phase" when used alone, as in the segment below?
"Faire le test HAUTE TENSION entre le contact de la fiche (phase) et l’applicateur de la pièce à main"

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*http://www.electropedia.org/iev/iev.nsf/display?openform&iev...