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I think itsmoked is correct. One suggestion is to use one of those voltage detector pens, like the one from fluke. You don´t have to touch the surface you suspect to be energized, just approach the probe of the pen and lights or beep will start.

Thanks to djs and danw2.

Ok in this case only two pins are really necessary. But why are there connectors with 4 pins? So far I haven´t got any reasonable explanation. Thanks anyway.

Actually I mean not the H1 but the spur segment.

Foundation fieldbus Connectors have 4 pins but only 2 are necessary. What are the other 2 for? Our contractor claims connectos with only 2 pins are suitable, where can I base his allegations on?