FIG. 10 represents a fourth example of a shielding device 1000 according to the invention in which the front part 1015 of the protective textile sleeve 1010 is folded on itself towards the outside. The folded front part 1015 has a substantially U-shape along a longitudinal-section plane P passing through the longitudinal axis L1 of the protective sleeve 1010 having a diameter D1. The front part 1015 of the protective sleeve 1010 is folded around the inner portion 1025 of the rear part 1030 of the connecting sleeve 1035. The rear part 1030 of the connecting sleeve 1035 is also folded on itself, in particular towards the inside of its interior volume 1037 around the outer portion 1040 of the front part 1015 of the protective sleeve 1010. The front part 1015 of the protective sleeve 1010 thus comprises superimposed inner 1045 and outer 1040 portions. The rear part 1030 of the connecting sleeve 1035 comprises inner 1025 and outer 1050 portions which are also superimposed. The inner 1045 and outer 1040 portions of the front part 1015 of the protective sleeve 1010, substantially annular in shape, are secured in an electrically conductive manner at least partially with the inner portion 1025, of substantially annular shape, of the rear part 1030 of the connecting sleeve 1035, especially by ultrasound.