34 the window openings 44 define passageways between the interior and the exterior of the arch segment 34 and are preferably disposed at positions such that they are at least partially covered by outer surfaces of the arm projections 38 of the support cradle 36 when the saddle clamp 20 is in the assembled condition as shown in fig2 as shown one or more raised ridges 42 may extend longitudinally along the length of the surface grooves 40 however such raised ridges may likewise be eliminated if desired as will be described further hereinafter such raised ridges may promote seated acceptance of electrical contact strips within the surface grooves 40 during use as best seen in fig1 in the exemplary configuration the exterior of the arch segment 34 includes a pair of circumferential raised walls 46 which are spaced apart in the axial direction of the clamp to define a circumferential depression 47 between the circumferential raised walls 46 the circumferential raised walls 46 may have a generally arched configuration with variable height relative to the circumferential depression 47 about the circumference of the arch segment 34 as shown the height difference between the raised walls 46 and the circumferential depression 47 may be greatest at the ends of the legs in which the window openings 44 are located thereby providing additional strength in those zones with little or no differential height at the top of the arch in the illustrated.