[ground connections for LED channel letters]

See in Vegas aal the secondary LED wire is in flex and through one way or another its all connected, hence grounding it all, are all your LED wires exposed?

[ground connections for LED channel letters]

You don't have to put a secondary ground on normal channel letters, your flex is considered your ground for anything under 6 foot. Reverse pans are a different story and need a ground because the face isnt contacting the flex.