I know a topic like this went down with the old forum. Here is a school. It was built in 1970. How could the alarm system changed over time?
I’ll start:
The school started out with Simplex 4251 Chevron pulls, an unknown Simplex panel, and a red annunciator by the main entrance. The alarms were Simplex 4051’s on 4050-80 light plates, coded to March Time. The light plates had the word “Fire” on the lenses.
In 1975, a 4050-80 was destroyed by a volleyball in the gym. The replacement alarm was a 4051, with a red light bulb behind a strong metal cage.
In 1980, Simplex had to come and replace a chevron. They put in a new 4251 T-handle pull station.
Later that year, some kid figured out how to open up a Chevron. To his surprise, it did not initiate an alarm. He told someone about it, and he was thanked for telling them, then suspended because he tampered with the pull station. So Simplex had to come AGAIN and replace the pull. They put in another 4251 T-Handle.
Simplex discontinued the annunciator.
In 1987, the annunciator died. Because it could no longer be replaced, the ended up replacing the panel with a 2001 and an annunciator. The 2001 was set to March as well.
In 1988, someone decided to set fire to a piece of paper. The detector above where the fire started did not go off. So a teacher pulled a T-handle. She pulled it so hard, it broke the station, which flipped open and smacked her hand. She grabbed a fire extinguisher and put the fire out. The 2001 panel would not reset for some reason. Simplex came and replaced the broken 4251 with a new 4251, and they put a sign next to it that says, “In case of fire, pull handle gently.”
In 1990, the 4050-80’s were replaced by 2903 strobe plates, and the little red light bulb in the gym got replaced by a 2903-style remote strobe, placed behind a cage.
1991 called for more repairs. A 4051 broke down.
1992 brought a panel upgrade to a 4002 and a new annunciator. The new annunciator was installed NEXT to the old annunciator, which was removed. The hole where the annun was got patched.
TO BE CONTINUED…