OK my first question of the new year, "What is it" ?
Never mind I found it on my favorite web search engine.
Ok my second question, which one? :roll:
I don't think it's as simple as you stated in you OP, I also beleive thats a typo in #2.
From this page
here
Power Wiring
1.
Check power voltage. Use 240V rated unit when supply is greater than 208V. (Most homes have 240V, 1PH service). Use 208V rated unit for 208V power.
2.
Use minimum 90? C/300V rated insulated copper conductors only, sized in accordance with National Electrical Code and local electrical code for the Amps in Ampere Chart. If allowed by code, NM cable may require a larger wire size than as listed on the chart.
3. Connect suitably sized equipment grounding wire to ground terminal provided.
4. Install a separate circuit breaker between supply and unit. Provide a power supply disconnect within sight of the steam generator or one that is capable of being locked in the open position.
5.
For single phase units, use two-wire supply source and equipment grounding wire. Neutral (white) wire is not required.
AMPERE CHART
I couldn't include chart as listed on web page ... (see link), I haven't played enough with PDF's and don't have a pdf editor.
†
All specifications shown are for 208V and 240V, single phase.
Consult factory for other voltage specifications.
†† See power wiring, note 2 above.
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Provide a power supply disconnect within sight of the steam generator or one that is capable of being locked in the open position as permitted by code.