In older installation until 1971 the combined PEN usually continued 'til wall outlet or lamp. So you got just two wires, but one is the earthed Neutral, usually bridged in the outlet between one pole and earth brackets of Schuko!
Basically TN-C, IMHO a scary system! Some parts of Austria did use it, but it was never very common, personally I haven't seen a TN-C system all my life! I was told about one by a friend, but that was definitely a hefty rural bodge job. He even seemed to be proud of it...
