Electrical equipment comprising: - an electrical device having a first and a second electrical supply terminal (31, 32), the electrical device comprising a brushless motor; and - an electrical filter connected between an electrical voltage source and the electrical device, said filter comprising: - a first electrical connection connecting a first output terminal of the source to the first electrical supply terminal of the device, said first connection comprising a first coil; - a second electrical connection connecting a second output terminal of the source to the second electrical supply terminal of the device; - a first capacitive assembly connected firstly to the first connection between the first coil and the first electrical supply terminal of the device, and connected secondly to the second connection via a first node; and - a second capacitive assembly connected firstly to the first connection between the first output terminal of the source and the first coil, and connected secondly to the second connection by a second node, said first node being located in the second electrical connection between said second node and the second electrical supply terminal of the device; said second connection comprising at least a second coil located between said first node and said second node, the first and second coils being positioned with respect to one another in order to produce a magnetic interaction therebetween, and have respective winding directions such that equal and variable electric currents which enter the source via the first and second output terminals, one of said currents separately via each output terminal, produce in each of the coils (L1, L2) a voltage contribution by mutual induction and a voltage contribution by self-induction which have a same sign for said coil, on average for a duration of use of the filter, the first coil having an inductance value between 0.1 and 1μH, a difference between an inductance value of the first coil and an inductance value of the second coil being less than or equal to 20%, the first and second electrical connections of the filter being connected one-by-one to the two electrical supply terminals (31, 32) of the device such that the first capacitive assembly is connected electrically in parallel with the device between said two electrical supply terminals of the device. - an electrical device having a first and a second electrical supply terminal (31, 32), the electrical device comprising a brushless motor; and - an electrical filter connected between an electrical voltage source and the electrical device, said filter comprising: - a first electrical connection connecting a first output terminal of the source to the first electrical supply terminal of the device, said first connection comprising a first coil; - a second electrical connection connecting a second output terminal of the source to the second electrical supply terminal of the device; - a first capacitive assembly connected firstly to the first connection between the first coil and the first electrical supply terminal of the device, and connected secondly to the second connection via a first node; and - a second capacitive assembly connected firstly to the first connection between the first output terminal of the source and the first coil, and connected secondly to the second connection by a second node, said first node being located in the second electrical connection between said second node and the second electrical supply terminal of the device; said second connection comprising at least a second coil located between said first node and said second node, the first and second coils being positioned with respect to one another in order to produce a magnetic interaction therebetween, and have respective winding directions such that equal and variable electric currents which enter the source via the first and second output terminals, one of said currents separately via each output terminal, produce in each of the coils (L1, L2) a voltage contribution by mutual induction and a voltage contribution by self-induction which have a same sign for said coil, on average for a duration of use of the filter, the first coil having an inductance value between 0.1 and 1μH, a difference between an inductance value of the first coil and an inductance value of the second coil being less than or equal to 20%, the first and second electrical connections of the filter being connected one-by-one to the two electrical supply terminals (31, 32) of the device such that the first capacitive assembly is connected electrically in parallel with the device between said two electrical supply terminals of the device. - a first electrical connection connecting a first output terminal of the source to the first electrical supply terminal of the device, said first connection comprising a first coil; - a second electrical connection connecting a second output terminal of the source to the second electrical supply terminal of the device; - a first capacitive assembly connected firstly to the first connection between the first coil and the first electrical supply terminal of the device, and connected secondly to the second connection via a first node; and - a second capacitive assembly connected firstly to the first connection between the first output terminal of the source and the first coil, and connected secondly to the second connection by a second node, said first node being located in the second electrical connection between said second node and the second electrical supply terminal of the device;