Terminal Box Fire Fire alarm that is useful for easy inspection and maintenance. This box is usually red so that it can be distinguished from the PABX terminal box and others. The placement of terminal box fire can be at the end of the corridor of the building so that the cable can go down easily through a connecting corridor between floors called a shaft. In this shaft, usually ME (mechanical electrical) installations are carried out, such as electricity lines, telephones, computer networks, water pipes and so on. Mechanical shafts are generally separate from electrical shafts.