Nodes and bump maps

I have a texture node set up so that two procedural textures are mixed (using an image texture as the mixing factor) with th resulting output being used as the bump map. However even with No RGB turned on and the Nor turned up to 25, I can’t get it to show any sign of bumpmapping. I’ve included a screenshot of the relevant settings. How do I fix this?

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Is the model uv-unwrapped? Because it’s set to UV coordinates.
Or, is it really large, like tens of blender units in scale?
Does it work correctly if you disable No RGB?

edit: try connecting it to the normal thingy in the output node?