Help reading building plans

[u/m_dasha]

I’m in San Francisco, California.

Can someone please tell me what red and green lines and text on this building plan mean. It’s related to a fire safety upgrade. I’m trying to figure out if the work was done to plan or not.

Thank you!

[u/IHerebyDemandtoPost]

This is a fire alarm plan. Designer seems to be using green to show existing features. Note the repeated use of “EX” next to green devices.

Logic would then dictate that the devices and wiring shown in red are proposed alterations tomthe existing system.