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Hey guys i'm on a project in which I have to use Safety Modules.

I'm confused with the pin-out diagram of the safety modules. They reference L and N lines of an AC source. I'm leaving you the data-sheets of two different Safety Modules, both make reference to L and N lines.

http://www.pizzato.com/PizzatoWeb/UserFiles/File/pdf/ZE_GCS01A15/ZE_GCS01A15-ENG_183-206.pdf (page 2)

https://cache.industry.siemens.com/dl/files/885/67585885/att_857967/v1/manual_safety_relay_3SK1_es-MX.pdf (page 50)

The safety Modules should go inside a machine in which the polarity (hot-neutral/L-N) is unknown. What does this mean, or what should I do to use them if I don't know what L and N are?

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  • \$\begingroup\$ I assume this is an industrial project since it requires safety modules. I've never seen an industrial project where L and N were interchangeable. NFPA79, for example, requires L, N, and GND busses to relate to each other in very specific ways. Even as far as dictating wire colors. I expect the safety modules were designed with this in mind, and may not be appropriate when the power feeds are unknown. \$\endgroup\$ – bitsmack Mar 28 '17 at 4:06
  • \$\begingroup\$ Not sure where he is from, but in much of continental Europe, standard outlets are not polarized, so anything with a plug (as opposed to fixed wiring) can distinguish live vs. neutral. \$\endgroup\$ – Evan Mar 28 '17 at 4:33
  • \$\begingroup\$ get the DC version and power the module from 24V DC \$\endgroup\$ – Jasen Mar 28 '17 at 4:52
  • \$\begingroup\$ Power outlets here don't differentiate the live from the neutral. I'll leave you a picture (Chile). imaginaisladepascua.com/wp-content/uploads/2013/08/… Maybe @Jasen is the way to go \$\endgroup\$ – Tomás Arturo Herrera Castro Mar 28 '17 at 14:34

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