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+---
+id:
+aliases:
+  - das
+tags:
+  - occupational
+  - occupational/systems/standalone-systems
+---
+# Distributed Antenna Systems (DAS)
+
+## Info
+
+### Emergency Responder Radio Communication Systems (ERRCS)
+
+### Cellular Systems
+
+Less common than ERRCS are "cellular DAS" systems
+
+## Sequence
+
+### 1. Estimate preparation
+
+Complete [[fire-alarm]] preparation and takeoff.
+
+### 2. Takeoff
+
+#### FACR to Every Elev. Shaft
+
+FACR TO ELEV PIT = 2" PVC40
+CA.28.31.5
+
+Match Fire Alarm takeoff Length and Count
+
+#### FACR to Every Staircase
+
+FACR TO STAIRWELL = 2" PVC40
+CA.28.31.8
+
+Match Fire Alarm takeoff Length and Count
+
+#### Stairwell Riser Every 2 Floors
+
+STAIRWELL RISER EVERY 2 FLRS = 1 1/2" EMT (20') W/ 16X16X6 BOX
+CA.28.31.12
+
+Create a Stairwell typical on every other floor
+
+#### FACR to Electric Room
+
+FACR TO 2HR-RATED RM = 2" PVC40
+CA.28.31.14
+
+Match Fire Alarm takeoff Length
+
+#### Electric Room Riser to Every Floor
+
+2HR-RATED RM RISER TO EVERY FLR = 2" EMT (15') W/ 16X16X6 BOX
+CA.28.31.18
+
+Takeoff in every Electric Room
+
+#### Top 2H Rated Room To Roof
+
+FACR TO ROOF = 2" EMT W/ RMC WEATHERHEAD & IMC STUB
+CA.28.31.18
+
+Use 15' or Height of ceiling on last building level
+
+#### Horizontal
+
+CORRIDORS EMT OH = 1 1/2" EMT W/ 16X16X6 BOX EVERY 80'
+CA.28.31.23
+
+CORRIDORS DECK = 1 1/2" PVC40, STUBBY, FLEX W/ 16X16X6 BOX EVERY 80'
+CA.28.31.21
+
+1-1/2 through corridors w/ 16x16x6 J-Box
+
+Length for every corridor/garage
+
+### 3. Extension (Review and Checking)