Adjustment device for adjusting a base of a bed, - comprising at least one electric motor for driving an adjustable portion (3, 4, 6, 7) of the base, - comprising a control apparatus for actuating and supplying power to each electric motor, which apparatus can be attached to a power supply via a power cable and can be connected to each electric motor via at least one motor cable, - wherein the power cable comprises a three-wire-conductor standard plug having an earthing contact for electrical connection to the power supply, which plug is complementary to a three-wire-conductor standard socket, having an earthing contact, of the power supply and comprises an outer conductor, a neutral conductor and a protective conductor, - wherein the power cable comprises a two-wire-conductor standard plug for electrical connection to the control apparatus, which plug is complementary to a two-wire-conductor standard socket of the control apparatus and comprises the outer conductor and the neutral conductor, said power cable comprising an additional plug which is complementary to an additional socket of the control apparatus and comprises the protective conductor, - wherein the power cable comprises a cable bundle, which comprises a first portion leading to the outer conductor, the neutral conductor and the protective conductor and comprising the three-wire-conductor standard plug having an earthing contact, a second portion leading to the outer conductor and the neutral conductor and comprising the two-wire-conductor standard plug and a third portion leading to the protective conductor and comprising the additional plug, which portions start from a common central point, - wherein the control apparatus comprises at least one electrical shield which is electrically connected to the additional socket via a grounding wire. - comprising at least one electric motor for driving an adjustable portion (3, 4, 6, 7) of the base, - comprising a control apparatus for actuating and supplying power to each electric motor, which apparatus can be attached to a power supply via a power cable and can be connected to each electric motor via at least one motor cable, - wherein the power cable comprises a three-wire-conductor standard plug having an earthing contact for electrical connection to the power supply, which plug is complementary to a three-wire-conductor standard socket, having an earthing contact, of the power supply and comprises an outer conductor, a neutral conductor and a protective conductor, - wherein the power cable comprises a two-wire-conductor standard plug for electrical connection to the control apparatus, which plug is complementary to a two-wire-conductor standard socket of the control apparatus and comprises the outer conductor and the neutral conductor, said power cable comprising an additional plug which is complementary to an additional socket of the control apparatus and comprises the protective conductor, - wherein the power cable comprises a cable bundle, which comprises a first portion leading to the outer conductor, the neutral conductor and the protective conductor and comprising the three-wire-conductor standard plug having an earthing contact, a second portion leading to the outer conductor and the neutral conductor and comprising the two-wire-conductor standard plug and a third portion leading to the protective conductor and comprising the additional plug, which portions start from a common central point, - wherein the control apparatus comprises at least one electrical shield which is electrically connected to the additional socket via a grounding wire.