Channel Letter Specification Freeze: Drawing Revisions, Wire Exits, and Approval Handover

Release channel letters for fabrication only after the approving parties sign off on the same drawing revision, LED module selection, wire exit layout, and control plan. Give the shop, purchasing team, and installer the approved package so each can work from the same dimensions, part numbers, and connection details.

Freeze the drawing set and bill of materials together

Give each drawing a number, revision, and issue date. Identify the sign and letter group on each sheet, then record the revisions of the mechanical drawing, wiring diagram, and bill of materials in the release record. If a change affects multiple documents, update all affected sheets before issuing the package. Retain earlier revisions for traceability and mark them superseded in the shop’s working files.

Show the letter depth, face and back construction, illumination direction, module layout, and mounting details that affect fit or routing. Call out narrow strokes, tight corners, or shallow sections that require a layout decision. Where the project calls for a representative sample, record the letter geometry, face material, and module layout used for approval so the shop can reproduce that configuration.

HansonLed’s channel letter catalog lists options including the Mini LED Module 1 LED and Mini LED Module 2 LED With Lens. Use the selected model’s datasheet and the actual letter construction to confirm layout and electrical requirements. Record the full orderable model and variant in the bill of materials. HansonLed channel letter LED modules

Dimension the wire exit from a fixed reference

Mark each wire exit on a labeled view and dimension it from a fixed edge, mounting datum, or another reference the shop and installer can locate. State whether the view is from the face or the rear so asymmetric letters and mirrored mounting templates can be checked in the correct orientation. Use a section view where a return, bracket, or raceway obscures the cable path.

Show the exit location and the route from the last internal connection to the field connection point. Define where the free lead length is measured from and where the connector or splice must be accessible. Confirm any required clearance, bend allowance, edge protection, strain relief, and sealing against the cable, hardware, and installation conditions. Coordinate the opening with the mounting template and check for conflicts with fasteners and framing before the shop drills it.

Specify the RGB control behavior before approving wiring

With whole-module RGB control, the emitters in a module share a color command, and modules on the same control zone change together. For a sign that changes color by letter, define which letters share a zone and which need independent control. HansonLed’s RGB module catalog lists an RGB 3 LED Module. Use the selected model’s wiring documentation to confirm the control method and connections. HansonLed RGB LED modules

Individually addressable RGB control lets the controller assign different colors to separate pixels, which can support a chase within a letter. An addressable pixel can correspond to a group of emitters, so confirm the controllable unit for the selected part. If pixel control is required, document the controller, compatible protocol, pixel order, and data direction where applicable. HansonLed’s pixel module catalog lists an Addressable RGB Pixel. HansonLed pixel LED modules

Release checklist for the shop, buyer, and installer

• Drawing set. Record the approved revisions and check that letter IDs match across shop drawings, wiring diagrams, and mounting templates.

• Bill of materials. Confirm the module model and variant, quantities by letter or assembly, and compatible power and control equipment against the applicable datasheets and design.

• Wire exits. Verify the viewing orientation, dimensions, lead lengths, penetration details, and access to field connections.

• Control intent. Record the approved lighting behavior and identify control zones or addressable pixel sequence as applicable.

• Approval record. Capture who approved the package, when they approved it, and which revisions their approval covers. Resolve open items that affect fabrication before release.

• Handover. Distribute the approved package to purchasing, fabrication, and installation. If a later change affects a released part or dimension, identify any material already ordered or work already cut before approving the revision.

Frequently asked questions

Does a wire exit move require a new approval?

If the move falls outside the approved tolerance or affects fit, cable routing, or field connections, revise the affected drawings and get approval before fabrication or rework. Check the mounting template and installer’s copy at the same time.

Can purchasing substitute a module with the same nominal voltage?

Review the substitute against the approved design and datasheets. Check fit, light distribution, electrical load, connection details, environmental suitability, and control compatibility as applicable. If those changes affect the released design, update the package and obtain approval before using the substitute.

What should the installer receive for a pixel-controlled sign?

Provide the approved wiring diagram and mounting template, controller and power supply locations, labeled connection points, and a pixel map that ties controller outputs and pixel sequence to letter IDs. Include any model-specific setup instructions needed to reproduce the approved behavior.