CTS AV Site Surveys 5 — Questions and Answers
Question 1: During a site survey, you note that the planned control system rack location is 280 feet from the primary display. Why is this distance critical to document?
- It determines the number of power outlets required at the rack
- It affects signal type selection, since some unbalanced video signals degrade over long runs (Correct answer)
- OSHA mandates documentation of all distances exceeding 100 feet
- It sets the minimum speaker cable gauge required by NEC
Correct answer: It affects signal type selection, since some unbalanced video signals degrade over long runs
Long cable runs can cause signal degradation, requiring the design team to specify signal extenders, fiber, or appropriate cable types rated for that distance.
Question 2: An AV site survey checklist should include verification of which fire and life safety element relevant to AV cabling?
- Sprinkler head clearance above the equipment rack
- Whether existing conduit is metallic or PVC for RF shielding
- Fire-stop ratings of wall and floor penetrations where cables will pass (Correct answer)
- The fire extinguisher class present in the equipment room
Correct answer: Fire-stop ratings of wall and floor penetrations where cables will pass
Any new cable penetration through a rated fire barrier must be fire-stopped to maintain the wall or floor assembly's fire rating, as required by building and fire codes.
Question 3: When conducting a site survey for outdoor AV installation, which environmental factor most directly affects equipment enclosure specification?
- Proximity to pedestrian pathways
- Ingress Protection (IP) rating requirements based on exposure to moisture and dust (Correct answer)
- The local time zone for scheduling automated control events
- Satellite signal availability for content delivery
Correct answer: Ingress Protection (IP) rating requirements based on exposure to moisture and dust
Outdoor environments expose equipment to rain, humidity, and dust, requiring enclosures and devices with appropriate IP ratings to prevent damage.
Question 4: A surveyor photographs an existing ceiling-mounted speaker layout in a space being renovated. What is the primary purpose of these photographs in the project record?
- To satisfy insurance documentation requirements before demolition
- To provide as-existing documentation so the design team can assess reuse, relocation, or removal needs (Correct answer)
- To verify the speaker brand for warranty claim purposes
- To calculate the acoustic absorption coefficient of the ceiling tiles
Correct answer: To provide as-existing documentation so the design team can assess reuse, relocation, or removal needs
Photographs of existing conditions help the design team evaluate whether existing equipment can be reused or must be relocated or removed during renovation.
Question 5: During a site survey, you identify that the planned display wall is an exterior-facing wall with fiberglass batt insulation. What concern should be noted for the design team?
- Exterior walls are not permitted for AV mounting under NFPA 72
- Thermal bridging through the wall may cause condensation on internal AV equipment
- Wall-mount anchoring may need to reach structural studs or blocking, which could be offset from standard spacing (Correct answer)
- The insulation will block IR signals from remote controls
Correct answer: Wall-mount anchoring may need to reach structural studs or blocking, which could be offset from standard spacing
Exterior walls may have non-standard stud spacing or blocking, and insulation cavities require hardware that can reach structural members for safe mounting loads.
Question 6: A site survey for a boardroom reveals a marble floor and plaster ceiling with no soft furnishings. Which acoustic treatment recommendation is most appropriate to note?
- Install a subwoofer array to compensate for low-frequency absorption
- Add absorptive panels or soft surfaces to reduce flutter echo and excessive reverberation (Correct answer)
- Specify omni-directional microphones to capture reflections
- Use only Bluetooth audio devices to avoid cable routing through hard surfaces
Correct answer: Add absorptive panels or soft surfaces to reduce flutter echo and excessive reverberation
Hard parallel surfaces cause flutter echo and long reverb times; absorptive treatment is needed to achieve acceptable speech intelligibility.
Question 7: When documenting network infrastructure during an AV site survey, which piece of information is most critical for IP-based AV control system design?
- The ISP provider name and account number
- Available switch port count, VLAN configuration, and whether PoE is supported (Correct answer)
- The brand of the wireless access points installed in the space
- The DNS server addresses used by office workstations
Correct answer: Available switch port count, VLAN configuration, and whether PoE is supported
IP-controlled AV devices require switch ports with proper VLAN segmentation and often PoE for touchpanels and IP cameras, making these parameters essential to document.
CTS AV Site Surveys 5
During a site survey, you note that the planned control system rack location is 280 feet from the primary display.
Why is this distance critical to document?