Documentation inconsistent in modeling multi-phase site meters

[davidwe]

What should be assigned to submeter_of if you have a 3-phase main meter and you know to which specific line the submeters are connected?

The 3-phase main meter is modeled as the first three entries in the dict elec_meters, which are all site_meters.

• In the tutorial (Chapter 1.1.1 Simple example in nilm_metadata/docs/source/tutorial.rst) every submeter is submeter_of one of this main meters, so either 1 or 2.
• But in the documentation of ElecMeter (Chapter 2.4 in nilm_metadata/docs/source/dataset_metadata.rst) it says (even twice in a paragraph) "All non-site-meters directly downstream of the site meters should set submeter_of=0. Optionally also use phase to describe which phase this meter measures." In the metadata for REDD it's done this way, too, but without specifying the phase field.

So which is the right way to do it?