The invention relates to a removable stabilizer for a spacer casing (24a-24f) of an electrical installation of the GIS type (20), the spacer casing (24a-24f) comprising a first opening (33) as well as a conductor (30b) provided with a bore (34), the removable stabilizer (29) comprising a plug (29a) configured to be introduced via the first opening (33) into the spacer casing (24a-24f), the plug being designed to penetrate into the bore (34) of the conductor (30b) so as to block said conductor (30b) against moving in translation after said spacer casing (24a-24f) has been put to atmospheric pressure.
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