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A modular building system arrangement includes a plurality of electrical building systems. Each electrical building system has a housing with a mechanical connector that is connectable with a like connector of each other building system housing. Members of any subset of the building system housings

A modular building system arrangement includes a plurality of electrical building systems. Each electrical building system has a housing with a mechanical connector that is connectable with a like connector of each other building system housing. Members of any subset of the building system housings are connectable with each other to form a building system assembly. The building systems of the building system assembly conjointly define an electrically conductive pathway interconnecting each of the building systems of the building system assembly. The pathway carries power and/or data.

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1. A building surveillance system arrangement, the system comprising: a rotatable camera;a controller that adjusts a position of the rotatable camera using a camera control signal; anda passive infrared (PIR) detection ring including a PIR sensor outputting motion information, the PIR detection ring

1. A building surveillance system arrangement, the system comprising: a rotatable camera;a controller that adjusts a position of the rotatable camera using a camera control signal; anda passive infrared (PIR) detection ring including a PIR sensor outputting motion information, the PIR detection ring configured to mount to an exterior of a base, wherein: an electrically conductive pathway is conjointly defined when a first surface of the rotatable camera is in contact with a second surface of the PIR detection ring, wherein the electrically conductive pathway is configured to carry at least one of the camera control signal and the motion information to the rotatable camera, andthe controller adjusts the position of the rotatable camera based on the motion information. 2. The building surveillance system of claim 1, wherein: the rotatable camera has a first field of view at a first camera position,the PIR sensor has a predetermined second field of view different than the first field of view, andthe controller adjusts the rotatable camera from the first camera position to a second camera position based on the motion information where the rotatable camera has a third field of view at least partially overlapping the second field of view. 3. The building surveillance system of claim 2, wherein the PIR detection ring includes a plurality of PIR sensors providing motion quadrant information, wherein the plurality of PIR sensors are positioned to provide 360 degrees of quadrant coverage. 4. The building surveillance system of claim 1, wherein: the rotatable camera and the PIR detection ring conjointly define a connection including the electrically conductive pathway, the connection including the first surface and the second surface, the first surface having at least one male electrical connector, the second surface having at least one female electrical connector connected to the at least one male electrical connector, andthe connection is made by rotating the rotatable camera relative to the PIR detection ring about an axis. 5. The building surveillance system of claim 4, wherein the rotatable camera and the PIR detection ring are aligned along the axis. 6. The building surveillance system of claim 1, wherein the passive infrared detection ring is configured to attach the rotatable camera to a building. 7. A method of operating a building surveillance system, comprising the steps of: outputting motion information, the outputting being performed by a passive infrared (PIR) detection ring including a PIR sensor, the PIR detection ring configured to mount to an exterior of a base;carrying at least one of a camera control signal and the motion information to a rotatable camera through an electrically conductive pathway conjointly defined when a first surface of a rotatable camera is in contact with a second surface of the PIR detection ring; andadjusting a position of the rotatable camera using the camera control signal based on the motion information. 8. The method of claim 7, wherein: the rotatable camera has a first field of view at a first camera position; andthe PIR sensor has a predetermined second field of view different than the first field of view, andthe adjusting step includes adjusting the rotatable camera from the first camera position to a second camera position based on the motion information, at the second camera position the rotatable camera having a third field of view at least partially overlapping the second field of view. 9. The method of claim 8, wherein the PIR detection ring includes a plurality of PIR sensors providing motion quadrant information, wherein the plurality of PIR sensors are positioned to provide 360 degrees of quadrant coverage. 10. The method of claim 7, wherein: the rotatable camera and the PIR detection ring conjointly define a connection including the electrically conductive pathway, the connection including the first surface and the second surface, the first surface having at least one male electrical connector, the second surface having at least one female electrical connector connected to the at least one male electrical connector, andthe connection is made by rotating the rotatable camera relative to the PIR detection ring about an axis. 11. The method of claim 10, wherein the rotatable camera and the PIR detection ring are aligned along the axis. 12. The method of claim 7, wherein the passive infrared detection ring attaches the rotatable camera to a building.