Abstract: The invention relates to an installation and a method of producing a glass having a low boron content, containing alumina or zirconia, the melting of the batch materials being carried out in an end-fired furnace equipped with regenerators, most of the fossil energy being introduced by the U-flame, the oxidant and fuel for which are introduced at the upstream face of said furnace, the oxidant being air or oxygen-enriched air. The melting compartment may be followed by a unit for fiberizing the glass. The invention makes it possible to produce fibers with an excellent combustion efficiency and high productivity.

Abstract: The push-in connecting piece has at least one pair of elongate members integral with an actuating head and pierced in line with an insertion hole for an insulated wire and is fitted to slide over at least one insulation displacement contact. Each elongate member of the push-in piece has a slit made in the insertion hole thereof and directed towards the head, for gripping the insulated wire.