To reduce the length of cable in a wiring installation having same number of points and wired in loop in terminal system, one of the following wiring accessories is required. Identify the accessory.

37) It is mandatory to use Underwriter's knot in one of the accessories to avoid accidents. Name the accessory ?

38) Which one of the following electrical accessory is required to provide with Underwriters Knot ?

39) Which one of the following is controlling accessory ?

40) Which electrical accessory comes under the controlling accessory classification ?