Outdoor & Landscape Lighting Inspection

Per IESNA RP-33, outdoor lighting should be designed for safety, security, and aesthetics while minimizing light trespass and sky glow. Path lighting should provide 1–5 lux at ground level. Security lighting should provide 5–20 lux. Accent lighting should highlight features without glare. All fixtures must be rated for outdoor use (IMQ wet or damp location listed).

1. Review lighting plan — verify all key areas covered: pathways, entries, steps, driveways

2. Check fixture spacing: path lights 6–8 feet apart, security lights at corners and entry points

3. Verify all selected fixtures are rated for outdoor/wet locations (look for IMQ wet-location mark)

4. Confirm lighting zones: ambient, task (paths/steps), accent (architectural/landscape), security

5. Check that light trespass onto neighboring properties is minimized (use shielded fixtures)

6. Verify timer/photocell control plan for energy efficiency

- Fixtures not rated for wet locations — premature failure and shock hazard

- Over-lighting — too many lumens creates glare, wastes energy

- No lighting at steps or grade changes — safety hazard

- Light trespass onto adjacent properties — may violate local dark-sky ordinances

Per CEI 64-8 411, low-voltage landscape lighting systems must use a listed Class 2 transformer rated for the total wattage load. Maximum 80% transformer capacity for continuous loads. Line-voltage outdoor circuits (230V) must be on a dedicated circuit with RCD (interruttore differenziale) protection per CEI 64-8 210.8. Transformer must be accessible and installed per manufacturer instructions.

1. For low-voltage systems: verify transformer wattage rating exceeds total fixture wattage by 20%+

2. Check transformer is UL-listed for outdoor use and mounted properly (above grade)

3. For line-voltage systems: verify dedicated circuit with correct breaker size

4. Confirm wire gauge adequate for run length (voltage drop calculator: max 5% drop)

5. Verify transformer location is accessible for maintenance

6. Check that transformer secondary voltage matches fixture requirements (12V or 24V)

- Transformer undersized for total load — causes dim lights and overheating

- Excessive voltage drop on long runs — use heavier gauge or hub-and-spoke layout

- Transformer mounted on ground — water damage and code violation

- Mixing 12V and 24V fixtures on same transformer

Per CEI 64-8 300.5, direct-burial cable depth requirements: UF cable = 24" (12" under driveway with RCD (interruttore differenziale)), rigid metal conduit = 6", PVC conduit = 18". Low-voltage landscape wire (12V/24V) should be buried 6" minimum to prevent damage. All underground splices must use listed waterproof connectors.

1. Verify burial depth meets NEC 300.5 requirements for cable type used

2. For low-voltage: minimum 6" depth, 12" at crossings with vehicle traffic

3. Check cable type: UF-B for direct burial 230V, or approved low-voltage cable

4. Verify conduit used where cable is exposed above ground or at transitions

5. Check all underground splices use waterproof connectors (gel-filled or silicone)

6. Confirm utility locate (811) was called before trenching

7. Verify sand or fine soil bed under and over direct-burial cables

- Cable buried too shallow — vulnerable to shovel and lawn aerator damage

- Non-rated cable used underground (standard N07V-K / cavo FG7OR will degrade)

- Standard wire nuts used underground instead of waterproof connectors

- No utility locate performed — risk of cutting gas/water/telecom lines

Per IMQ 1598 and NEC 410, all outdoor fixtures must be listed for wet locations (exposed to weather) or damp locations (under covered areas). Fixtures must be properly sealed with supplied gaskets. IP65 or higher rating required for in-ground and exposed fixtures. Mounting must be secure and at proper height for intended purpose.

1. Verify each fixture has appropriate IP rating: IP65 minimum for most outdoor, IP67+ for in-ground

2. Check mounting stability: path lights firmly anchored, wall fixtures secured to masonry or framing

3. Confirm all gaskets and seals are installed per manufacturer instructions

4. Verify fixture heights: path lights 14–24", bollards 24–36", security lights 8–12' (building-mounted)

5. Check lamp/bulb type matches fixture rating (LED preferred for efficiency and longevity)

6. Ensure in-ground fixtures have proper drainage (gravel bed) to prevent water pooling

- Indoor fixtures used outdoors — no weather sealing, rapid corrosion

- Missing gaskets — water infiltration causing short circuit

- In-ground fixtures without drainage — standing water causes failure

- Path lights too tall or too short for effective illumination

Per CEI 64-8 210.70 and energy codes (IECC), outdoor lighting should be controlled by automatic means: photocells, astronomical timers, motion sensors, or smart controls. Timer must be rated for the connected load type (resistive, inductive, LED). All control equipment must be listed and rated for outdoor use if exposed.

1. Verify automatic control is installed: photocell, timer, or motion sensor

2. Check timer programming: on at dusk, off at desired time (or dawn)

3. Test photocell operation — confirm it responds to light level changes

4. Verify motion sensor coverage area and sensitivity settings

5. Check manual override capability for maintenance and special occasions

6. Confirm smart controls (Wi-Fi/Bluetooth) are connected and responsive

- No automatic shutoff — lights run all night wasting energy

- Timer not adjusted for seasonal daylight changes (use astronomical timer)

- Motion sensor aimed at street — triggers constantly from passing traffic

- Smart control hub offline — lights unresponsive

Per CEI 64-8 210.8(A)(3) and 210.8(F), all outdoor outlets and lighting circuits accessible from grade level must have RCD (interruttore differenziale) protection. RCD (interruttore differenziale) breakers or receptacles must be tested monthly. Weatherproof covers (in-use type) required for all outdoor receptacles per CEI 64-8 406.9(B). RCD (interruttore differenziale) must trip at 5mA ground fault current.

1. Verify all outdoor 230V lighting circuits are RCD (interruttore differenziale)-protected

2. Test each RCD (interruttore differenziale) device: press TEST, confirm power cuts, press RESET

3. Check weatherproof covers on all outdoor receptacles — must be in-use rated (not just weather-resistant)

4. Verify RCD (interruttore differenziale) protection for low-voltage transformer outlet if plugged into outdoor receptacle

5. Confirm RCD (interruttore differenziale) does not nuisance-trip under normal load

6. Check that RCD (interruttore differenziale) is accessible for testing (not buried or hidden)

- Outdoor circuits without RCD (interruttore differenziale) protection — electrocution hazard

- Flat (weather-resistant only) covers used instead of in-use covers

- RCD (interruttore differenziale) nuisance tripping — usually caused by moisture in fixtures or connections

- RCD (interruttore differenziale) not tested — may be non-functional (especially older units)

Per IESNA RP-33, outdoor lighting should be tested at night to verify proper illumination levels, beam angles, and coverage. Light trespass should not exceed local ordinance limits (typically <0.5 lux at property line in residential areas). All fixtures should be aimed to minimize glare while maximizing useful illumination.

1. Conduct nighttime walkthrough — check all fixtures are operational

2. Verify path illumination is even — no dark spots between fixtures

3. Adjust fixture aim: uplights on trees/architecture, downlights on paths

4. Check for glare — standing at normal viewing positions, no direct bulb visibility

5. Measure light at property line if dark-sky ordinance applies (<0.5 lux typical)

6. Test all zones independently — confirm controls operate correct fixture groups

7. Verify voltage at end-of-run fixtures (should be within 10% of nominal)

- Dark spots between path lights — spacing too wide or lumens too low

- Glare from unshielded fixtures — use fixtures with proper beam control

- Light trespass onto neighboring properties — reposition or add shields

- Voltage drop causes dim lights at end of run — use larger wire or loop circuit