Type B Vital Relays - Alstom

General Description
1.2.8. Guide Rods
Two guide rods, which extend from the face of the plugboard 8-1/2 inches, help guide
the relay into alignment with the insulators on the plugboard.
Each rod has a knurled nut and a lock nut to secure the relay on its plugboard, as
shown in Figure 1–14.
LOCK NUTS
GUIDE RODS
KNURLED
NUTS
Figure 1–14. B1 Relay showing Guide Rods and Nuts
1.2.9. Wiring
Wires strapped together in cable form are supported behind the plugboard. Each wire is
identified with a tag and then connected to its terminal. The terminal is pushed into its
slot in the plugboard and locked in place.
The plugboard back can accommodate the mounting of a two-post terminal block as
shown in Figure 1–16. This can be used to terminate coil leads where coils in a relay
are circuited independent of one another.
P1457, Rev. Nov/07 1–14 Alstom Signaling Inc.