Deutsch > Englisch Technik E-Technik/Elektronik lightning protection

This is from the specifications for an extensive renovation in a public building, regarding the installation of interior lightning protection:

"Ein *Potentialausgleich* zur Beseitigung der Potentialunterschiede an z.B. Wasser-, Gas-, Heizungsrohrleitungen, Lüftungskanälen ist zum Hauptpotentialausgleich herzustellen."

In other parts of the text, I have been translating "potentialausgleich" with "equipotential bonding", e.g.:

Schutz- und Blitzschutz-Potentialausgleich / Equipotential bonding for protection and lightning-protection...

but that seems a bit clumsy in the sentence at hand. My translation so far:

To remove potential differences from, e.g., water, gas, heating, and ventilation pipes/ducts, *an equipotential bonding is to be connected* to the main potential equalisation.

...is to be connected...? Any ideas, comments? Thanks! OW