The bases B1 – B9 are designed for the connection of the smoke detector SPD-3.10 to various types of fire alarm loops – 2-wire with an External Device of Optical Alarm (EVOA) or without it, 4-wire with N.C. /N.O. relay contacts.

The connection of a detector to a control panel with a 2-wire alarm loop is realized by means of bases B01, B1. The connection of a detector to a control panel with a 4-wire alarm loop is realized by means of bases B2, B3, B4, and B5.

Bases B6, B7, B8, and B9 are terminal, installed singly at the end of each loop and used in 4-wire alarm loops for the control of presence of power voltage and the integrity of circuit.

The list of bases, their differences and the way of connection are specified in the table. More detailed description of each base look in passports.