Housing module of a field device used in measuring and automation technology, comprising: a housing with a housing wall (11.1) and a first housing chamber (12.1) and a second housing chamber (12.2), wherein the housing chambers are separated particularly by a detachable partition wall, wherein a measuring/operating electronics unit (16.1) of the field device is arranged in the first housing chamber, and wherein a connection electronics unit (16.2) to connect cables to the energy supply system of the field device and/or to exchange data is arranged in the second housing chamber, wherein the partition wall has a through opening (13.1), wherein an electrical feedthrough to connect the measuring/operating electronics unit to the connection electronics unit is arranged in the through opening, wherein the feedthrough satisfies requirements of the Ex-d standard according to IEC60079-1 of 2014-06, EN60079-1 of 2014-06, wherein the feedthrough has an electrically isolating support body (14.1) with a longitudinal axis (14.2) and several electrically conductive connection units (14.3) to provide the electrical connection, wherein the connection units pass through bores or through openings (14.4) of the support body, wherein the bores each have a first extension (14.41) along a bore axis (14.42) and an internal diameter (14.43), wherein the connection units each have an outer diameter (14.301), wherein the connection units are held with positive locking in the support body in the direction of the second housing chamber on a side of the support body facing towards the first housing chamber, characterized in that a ratio of a difference between the inner diameter of the bore and the outer diameter of the associated connection unit to the first extension (14.41) is less than 0.05 and particularly less than 0.025 and preferably less than 0.02, wherein the support body of a side of the partition wall facing towards the first housing chamber is introduced into the through opening and forms a flame barrier according to the Ex-d standard. a housing with a housing wall (11.1) and a first housing chamber (12.1) and a second housing chamber (12.2), wherein the housing chambers are separated particularly by a detachable partition wall, wherein a measuring/operating electronics unit (16.1) of the field device is arranged in the first housing chamber, and wherein a connection electronics unit (16.2) to connect cables to the energy supply system of the field device and/or to exchange data is arranged in the second housing chamber, wherein the partition wall has a through opening (13.1), wherein an electrical feedthrough to connect the measuring/operating electronics unit to the connection electronics unit is arranged in the through opening, wherein the feedthrough satisfies requirements of the Ex-d standard according to IEC60079-1 of 2014-06, EN60079-1 of 2014-06, wherein the feedthrough has an electrically isolating support body (14.1) with a longitudinal axis (14.2) and several electrically conductive connection units (14.3) to provide the electrical connection, wherein the connection units pass through bores or through openings (14.4) of the support body, wherein the bores each have a first extension (14.41) along a bore axis (14.42) and an internal diameter (14.43), wherein the connection units each have an outer diameter (14.301), wherein the connection units are held with positive locking in the support body in the direction of the second housing chamber on a side of the support body facing towards the first housing chamber, characterized in that a ratio of a difference between the inner diameter of the bore and the outer diameter of the associated connection unit to the first extension (14.41) is less than 0.05 and particularly less than 0.025 and preferably less than 0.02, wherein the support body of a side of the partition wall facing towards the first housing chamber is introduced into the through opening and forms a flame barrier according to the Ex-d standard.