Indoor light fitting bracket support for firmly tightening an insulated electric cable, said bracket comprising: a) a first body comprising a front face, a rear wall, a first side wall having a first upper part and a first lower part, said first upper part projecting from said first lower part, a second side wall having a second upper part and a second lower part, said second upper part projecting from said second lower part, b) a second body comprising a front face, a rear wall, a first side wall having a first upper part and a first lower part, said first upper part projecting from said first lower part, a second side wall having a second upper part and a second lower part, said second upper part projecting from said second lower part, c) the rear wall of the first body and the rear wall of the second body each comprising at least one vertical slot (12A; 12B) over their entire height and said slots (12A; 12B) facing one another and being adapted to firmly tighten an insulated electric cable, d) the rear wall of the first body facing the rear wall of the second body, said rear wall of the first body being firmly fixed against said rear wall of the second body by a fastening means (16A; 16B) passing through each of the said rear walls, characterised in that e) the upper central part of said first and second bodies (2; 7) each comprise a depression (13A; 13B), and in that f) a passage (14A, 14C) adapted for a fastening means passes vertically through the first upper part projecting from each of the first and second bodies, and in that g) a passage (14B, 14D) adapted for a fastening means passes vertically through the second upper part projecting from each of the first and second bodies. a) a first body comprising a front face, a rear wall, a first side wall having a first upper part and a first lower part, said first upper part projecting from said first lower part, a second side wall having a second upper part and a second lower part, said second upper part projecting from said second lower part, b) a second body comprising a front face, a rear wall, a first side wall having a first upper part and a first lower part, said first upper part projecting from said first lower part, a second side wall having a second upper part and a second lower part, said second upper part projecting from said second lower part, c) the rear wall of the first body and the rear wall of the second body each comprising at least one vertical slot (12A; 12B) over their entire height and said slots (12A; 12B) facing one another and being adapted to firmly tighten an insulated electric cable, d) the rear wall of the first body facing the rear wall of the second body, said rear wall of the first body being firmly fixed against said rear wall of the second body by a fastening means (16A; 16B) passing through each of the said rear walls, characterised in that e) the upper central part of said first and second bodies (2; 7) each comprise a depression (13A; 13B), and in that f) a passage (14A, 14C) adapted for a fastening means passes vertically through the first upper part projecting from each of the first and second bodies, and in that g) a passage (14B, 14D) adapted for a fastening means passes vertically through the second upper part projecting from each of the first and second bodies.