What does this mean ? (1 Viewer)

[Bart]

What does this +30 on the positive feed mean in this wiring diagram for an alarm siren ??
I know the 3a refers to the fuse size

 

[mitzimad]

Possibly the fuses number in the box

 

[Cavs]

Is it not the same as the code numbers on relays? I think number 30 is 12v permanent live.

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[jockaneezer]

As @Cavs said.

 

[Bart]

Is it not the same as the code numbers on relays? I think number 30 is 12v permanent live.

I'm pretty sure this is what it means , as the connection is for the positive feed for the alarm siren , and i also seen this +30 mentioned in relation to the positive feed for the alarm microwave sensor.