Final answer:
Branching or 'T' tapping a conventional fire alarm initiating circuit involves connecting multiple devices to a single circuit in a 'T' shape.
Step-by-step explanation:
Branching or "T" tapping a conventional fire alarm initiating circuit involves connecting multiple devices to a single circuit. This is commonly done in fire alarm systems to extend the coverage area or to add additional devices such as smoke detectors or pull stations.
The 'T' tap refers to the way the devices are connected to the circuit. A branch wire is connected to the main circuit, forming a 'T' shape. The devices are then connected to the branch wire.
For example, if you have a fire alarm system with a main initiating circuit and you want to add a smoke detector in another room, you can branch or 'T' tap the main circuit by running a branch wire from the main circuit to the new smoke detector. This allows the new detector to receive power and signaling from the main circuit.