diff --git a/.coveragerc b/.coveragerc
index 2ea0f11a6bd..f0953f49cd5 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -24,6 +24,9 @@ omit =
     homeassistant/components/device_tracker/tomato.py
     homeassistant/components/device_tracker/netgear.py
     homeassistant/components/device_tracker/nmap_tracker.py
+    homeassistant/components/light/vera.py
+    homeassistant/components/sensor/vera.py
+    homeassistant/components/switch/vera.py
 
 
 [report]
diff --git a/homeassistant/components/sensor/vera.py b/homeassistant/components/sensor/vera.py
index 8f9ede0182d..6fd978ccd20 100644
--- a/homeassistant/components/sensor/vera.py
+++ b/homeassistant/components/sensor/vera.py
@@ -57,7 +57,8 @@ import logging
 import time
 
 from homeassistant.helpers import Device
-from homeassistant.const import ATTR_BATTERY_LEVEL
+from homeassistant.const import (
+    ATTR_BATTERY_LEVEL, ATTR_TRIPPED, ATTR_ARMED, ATTR_LAST_TRIP_TIME)
 # pylint: disable=no-name-in-module, import-error
 import homeassistant.external.vera.vera as veraApi
 
@@ -149,7 +150,7 @@ class VeraSensor(Device):
 
         if self.vera_device.is_armable:
             armed = self.vera_device.refresh_value('Armed')
-            attr['Armed'] = 'True' if armed == '1' else 'False'
+            attr[ATTR_ARMED] = 'True' if armed == '1' else 'False'
 
         if self.vera_device.is_trippable:
             last_tripped = self.vera_device.refresh_value('LastTrip')
@@ -157,9 +158,9 @@ class VeraSensor(Device):
                 "%Y-%m-%d %H:%M",
                 time.localtime(int(last_tripped))
             )
-            attr['Last Tripped'] = trip_time_str
+            attr[ATTR_LAST_TRIP_TIME] = trip_time_str
             tripped = self.vera_device.refresh_value('Tripped')
-            attr['Tripped'] = 'True' if tripped == '1' else 'False'
+            attr[ATTR_TRIPPED] = 'True' if tripped == '1' else 'False'
 
         attr['Vera Device Id'] = self.vera_device.vera_device_id
         return attr
diff --git a/homeassistant/components/switch/vera.py b/homeassistant/components/switch/vera.py
index 16613648580..0811ac3b0b9 100644
--- a/homeassistant/components/switch/vera.py
+++ b/homeassistant/components/switch/vera.py
@@ -57,7 +57,8 @@ import logging
 import time
 
 from homeassistant.helpers import ToggleDevice
-from homeassistant.const import ATTR_BATTERY_LEVEL
+from homeassistant.const import (
+    ATTR_BATTERY_LEVEL, ATTR_TRIPPED, ATTR_ARMED, ATTR_LAST_TRIP_TIME)
 # pylint: disable=no-name-in-module, import-error
 import homeassistant.external.vera.vera as veraApi
 
@@ -144,7 +145,7 @@ class VeraSwitch(ToggleDevice):
 
         if self.vera_device.is_armable:
             armed = self.vera_device.refresh_value('Armed')
-            attr['Armed'] = 'True' if armed == '1' else 'False'
+            attr[ATTR_ARMED] = 'True' if armed == '1' else 'False'
 
         if self.vera_device.is_trippable:
             last_tripped = self.vera_device.refresh_value('LastTrip')
@@ -152,11 +153,9 @@ class VeraSwitch(ToggleDevice):
                 "%Y-%m-%d %H:%M",
                 time.localtime(int(last_tripped))
             )
-
-            attr['Last Tripped'] = trip_time_str
-
+            attr[ATTR_LAST_TRIP_TIME] = trip_time_str
             tripped = self.vera_device.refresh_value('Tripped')
-            attr['Tripped'] = 'True' if tripped == '1' else 'False'
+            attr[ATTR_TRIPPED] = 'True' if tripped == '1' else 'False'
 
         attr['Vera Device Id'] = self.vera_device.vera_device_id
 
diff --git a/homeassistant/const.py b/homeassistant/const.py
index e90f1338b83..ed74f1edf4f 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -73,6 +73,16 @@ ATTR_LOCATION = "location"
 
 ATTR_BATTERY_LEVEL = "battery_level"
 
+# For devices which support an armed state
+ATTR_ARMED = "device_armed"
+
+# For sensors that support 'tripping', eg. motion and door sensors
+ATTR_TRIPPED = "device_tripped"
+
+# For sensors that support 'tripping' this holds the most recent
+# time the device was tripped
+ATTR_LAST_TRIP_TIME = "last_tripped_time"
+
 # #### SERVICES ####
 SERVICE_HOMEASSISTANT_STOP = "stop"