Wellele

    • Is Aluminum Foil Fire Sleeve Conductive?

    Aluminized fire sleeve fitted over a cable and kept clear of a live copper busbar inside a switchgear panel

    Yes. The outer face of an aluminum foil fire sleeve is aluminium, and aluminium is a metal. That one fact decides where this sleeve may be used and where it must not.

    What conducts and what does not

    The finished sleeve presents a conductive outer face. The foil is the reflective layer and it is metal. Behind it, the fiberglass core is an inorganic insulator and the fire resistant layer holds the core together under flame contact. Neither of those layers is there to provide electrical insulation.

    Judging the sleeve by its core is the source of the error. The working surface, the one that touches anything you route it past, is the foil.

    Four situations where that matters

    1. A foil sleeve crossing near a live terminal can bridge to earth through the face.
    2. A foil face resting against a damaged conductor jacket puts metal against exposed metal.
    3. Band clamps and stainless ties used to close the sleeve are conductive too, so the finished assembly is a metal path end to end.
    4. A foil sleeve bundled alongside live cores can abrade the jacket under vibration, and the metal face is the harder surface.

    How to use it near live conductors

    Keep the run mechanically clear of live parts and treat the sleeve as a thermal component, not an insulating one. Where the sleeve must be handled, bundled with conductors or routed through a panel, move the insulation duty to a non-conductive sleeve.

    When electrical insulation is the job

    Three routes cover most of it. Polyolefin heat shrink is the standard insulating sleeve, specified against UL 224 and IEC 60684. Silicone coated fiberglass sleeving gives an insulating sleeve rated -60°C to +200°C. PVC heat shrink covers lower temperature work.

    None of them reflects radiant heat. Where a route needs both, split the duties: insulate the conductor, then add the thermal protection outside it.

    What to send

    Tell us the conductor arrangement, the voltage present, the clearances the panel allows and the surface temperature at the hottest point. Send that and we return the sleeve that fits the duty.

    Wellele products in this guide

    Wellele supplies the products behind this guide and sizes them to your diameter, temperature and voltage class. Common search terms buyers use: is fire sleeve electrically conductive, aluminized sleeve electrical insulation, fire sleeve over live cable. For a custom run, request a quote with your drawing.

    Frequently asked questions

    Is the whole sleeve conductive, or only the foil?

    Only the foil face and the metal closures are conductive. The fiberglass core and the fire resistant layer are not, but the core sits behind the foil, so it is not the surface you route against anything.

    Can I ground the sleeve instead of insulating it?

    Grounding is a design decision that belongs to the electrical engineer. Do not assume a foil sleeve is safe to leave floating near live parts.

    Does the sleeve conduct heat as well as current?

    It does both. Metal conducts heat, which is why the foil has to stay off a hot line, and it conducts current, which is why it has to stay off live parts.

    What do I use where I need heat and electrical protection together?

    Split the duties. Put a non-conductive sleeve on the conductor for insulation, then add thermal protection outside it, or pick a coated build that covers both within its published rating.

    Does routing a foil sleeve near cables break a standard?

    Clearance and creepage come from the installation standard for the equipment, not from the sleeve. Check the required distances for your panel or machine before you route it.