Insulation Resistance Test Connections?

[Aeoleone]

From the cited reference page:

Is there something I’m missing?

[SecondGen]

I think the key here is “on equipment 600V or lower”

Its not uncommon to find testers rated for 600V without a guard terminal, only Positive (+) and Negative (-). The reference material could probably use an update to make this more clear.

[Aeoleone]

Huh, today I learned. Thank you!