Quick answer: Before shipping channel letters, check appearance, lighting, sealing, wiring, destination-compatible power equipment, mounting, packaging and test records against the approved order. Release the shipment only after defects are corrected and rechecked. Keep photographs, electrical readings and an inspector-signed checklist with the order.
A sign that lights up can still arrive with the wrong plug, missing mounting studs or scratched acrylic. This pre-shipment checklist gives buyers and installers a practical acceptance framework. Agree the tolerances, test conditions and required documentation before production; it is not a claim that every sign has the same construction or certification.
1. Appearance and surface finish
- Check stainless steel, aluminium and acrylic for scratches, dents, pitting and distortion.
- Inspect painted or powder-coated surfaces for uneven coverage, runs, orange peel and missed areas. Compare the finish with the approved sample.
- Check that welds are dressed smooth and accessible edges have no sharp burrs.
- Verify lettering, dimensions and spacing against the latest approved drawing. Remove dust, adhesive residue and fingerprints.
Photograph the front, sides and rear before protective wrapping hides the finish.
2. LEDs and lighting quality
- Illuminate every letter: no failed LEDs, visible flicker, dark patches or unwanted colour differences.
- Check the specified white colour temperature or RGB scenes, including the supplied controller.
- Confirm modules or COB strips, where used, are securely fixed. Inspect seams and joints for unintended light leakage.
Inspect front-lit channel letters for even face illumination. For backlit channel letters, assess the halo using the agreed wall background and stand-off distance.
3. Sealing and outdoor protection
- Inspect specified sealant beads for gaps, bubbles and missing sections; confirm the required curing time.
- Check cable exits, rear covers and joints. Preserve any designed drainage or ventilation openings.
- Match outdoor protection to the approved specification, including connectors and power-equipment location.
If the order specifies IP65, request supporting evidence for the relevant assembly. A visual sealant check does not prove an IP rating, and an IP67 driver does not make the complete sign IP67. Intertek explains ingress-protection testing under IEC 60529.
4. Wiring and electrical checks
- Confirm cable size against circuit current, cable length and installation conditions.
- Inspect secure terminations, insulation, strain relief and polarity labels; no exposed copper or loose strands.
- Include a circuit diagram and connection labels. Verify protective earthing and electrical safety tests where applicable to the design and destination.
Qualified personnel should perform electrical tests and mains connections. Record the specified tests rather than improvising test voltages.
5. Power supply, plug and destination
Check AC input, frequency and plug separately from DC output. Constant-voltage LED strips need a compatible constant-voltage supply; confirm the actual module requirements rather than assuming every LED system is identical. Our LED sign power-supply selection guide covers installation environments.
- Sum the LED and controller load by circuit. Confirm output voltage, current and permitted loading at the actual temperature and input voltage.
- Define any reserve clearly. A 100 W load with 25% capacity above load gives 125 W; limiting loading to 80% also gives 100 ÷ 0.80 = 125 W. These are calculation choices, not universal requirements. Follow the selected model’s datasheet; MEAN WELL’s LED power-supply FAQ explains loading and operating conditions.
- Supply the agreed rated cord and plug, not an improvised travel adaptor. Hardwired installations may require no plug. Preserve protective earth where required.
- For outdoor supplies, check the specified enclosure, sealed cable glands and compatible junction boxes. Label input/output ratings and keep different destination batches separate.
- Pack spare supplies or fuses only in the quantities and types agreed in the contract.
Country reference: confirm the actual installation
| Destination | Typical mains | Frequency | Common plug families |
|---|---|---|---|
| USA / Canada | 120 V | 60 Hz | A / B |
| Japan | 100 V | 50 or 60 Hz by region | A |
| France | 230 V | 50 Hz | C / E |
| Germany | 230 V | 50 Hz | C / F |
| UK | 230 V | 50 Hz | G |
| Australia | 230 V | 50 Hz | I |
| UAE | 230 V | 50 Hz | G |
| Saudi Arabia | 220–230 V; confirm site | 60 Hz | G |
This is a planning reference, not approval of a particular cord set; see Bel’s world plug and input-voltage guide. Japan’s 100 V refers to AC input: the LED output remains its specified DC voltage. Do not label a supply “100–110 V compatible” unless its datasheet supports it.
Check model-specific destination documents: a Recognized Component is not the same as a UL Listed finished sign. Review appropriate UL/ETL coverage where required, the applicable EU Declaration of Conformity and CE obligations, and Japan’s PSE requirements for covered equipment. Do not infer complete-sign approval from a driver label.
6. Structure and mounting accessories
- Check frames, rails and brackets for straightness and secure assembly.
- Match mounting-hole positions, letter spacing and templates to the drawing.
- Count studs, screws, nuts and spacers. Confirm they suit the agreed installation design; site-specific wall fixings require installer approval.
7. Packaging and shipment labels
- Protect faces, corners and metal finishes with compatible non-abrasive materials. Prevent movement and pressure on fragile faces.
- Separate accessories and power equipment. Use the agreed carton or crate and moisture protection suited to the shipping route.
- Label order number, package number, quantities, ratings and handling orientation. Include the packing list, mounting drawing and installation instructions.
Photograph the open packing layout and closed packages. Check the large illuminated-letter shipping guide when agreeing transport protection.
8. Function-test record and release
A 30-minute powered observation can be an agreed minimum screening step, not proof of service life or full thermal stability. Specify a longer test when the design or contract requires it. Record lighting stability, temperatures and acceptance limits under stated conditions.
| Record | What to capture |
|---|---|
| Identity | Order, letter/circuit IDs and drawing revision |
| Electrical / thermal | Test input, DC output, measured load, ambient temperature and relevant component temperatures |
| Duration / result | Start/end time, lighting observations and pass/fail criteria |
| Release | Defects, correction and recheck evidence; inspector signature and date |
Buyer questions
Does every outdoor letter need the same IP rating?
No. Specify protection for the exposure and complete assembly; component ratings alone are insufficient.
Is 20–30% power reserve always necessary?
No universal percentage replaces the selected supply’s loading limits and temperature derating. Define how any agreed reserve is calculated.
Does a lighting video replace inspection?
No. It cannot confirm hidden wiring, accessory quantities, documentation or packaging condition.
Agree the checklist before production
Request a channel-letter quotation with artwork, dimensions, destination, installation exposure and required inspection documents. Agree acceptance criteria before production and retain the completed record before authorising shipment.