This clause of Part 1 is applicable except as follows: Replacement: This standard applies to concrete vibrators, the active part (vibrator bottle) of which is intended to be immersed into the mass of concrete to be vibrated. They may be of one of the following designs: - the motor and the vibrating mechanism are inside the vibrator bottle to which the part containing the mains switch is connected by means of a long flexible hose containing the interconnecting wires; - the motor and the vibrating mechanism are inside the vibrator bottle to which a handle comprising the part containing the mains switch is fixed by means of a short rigid tube, these parts forming a constructional unit; - the vibrator mechanism only is inside the vibrator bottle to which a separate portable unit comprising the motor and the part containing the mains switch is connected by means of a long flexible hose containing a flexible shaft. Stationary concrete vibrators intended to vibrate concrete moulds, for example for prefabricated concrete elements, are not within the scope of this standard.