I'm unsure which is the common post and which are the travelers. I THINK the common is the black post on top… but I really don't know. I though the travelers were parallel to each other. Can you tell from the pictures which one is the common wire?
Electrical – Which one is the common wire on this 3-way switch
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All sorted now, basically I have a plastic back box but the earths have a connector on them. The Loop N terminals are for convenience, so I've just bought a connector block to connect them up. The L1 and Coms just need to have the same wiring on the new dimmer switch. I've not done it yet but got my answer from another forum.
That looks like a standard appliance cord.
Look closely at the cord and you will notice one conductor is ribbed. Follow it... It should lead to the neutral side of the plug and the white wire on the dishwasher. The ribbed side being neutral is an industry standard, if the plug is molded on to the cord it will follow this convention.
You are correct about the wide BLADE being neutral, but wrong about how to follow it.
I think I can see the rib in both pictures, when enlarged, and it appears correctly wired, but you should double check this.
Edit addition:
There are different type of rib on SPT cord, the picture shows a single rib. There are also versions with multiple small ribs, which is more obvious.
On the straight cord picture in the question the ribbed conductor appears to be the one without the writing.
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Best Answer
Black is the common.
This can be confirmed with a multimeter on an unconnected switch. Testing for resistance, there should be infinite on the two brass terminals regardless of the switch position. The connection between the black and each brass should change from infinite to direct connection with the flip of the switch.