Electrical Panel

What are the differences between a group of three phase power and single phase?

My electrician told me that I need a new phase of three panels to replace a single panel phase, but I have my doubts. What are the fundamental differences? I suspect that my panel "Single" phase can phase power because it seems that a three-phase HVAC unit is being provided by this panel.

What makes you think that your board "single" phase can provide 3 phase? Where are you? Different rules apply to different countries. If you are in Australia, the United Kingdom or certain parts of Europe, you should see (clearly) 3 different colored cables feeding the table main distribution, so it is 3 phases. In Australia, the colors are red (phase A), white (phase B) and blue (phase C). The neutral conductor shall be black. If you have the misfortune to be in the United States, you can see a multitude of cables white with a red (maybe) and perhaps a black or 2. If you are United States, I'd get an electrician.

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319 25S AB 40 LM GENERAL ELECTRIC AC PANEL VOLTMETER
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308017 AB 40 General Electric A C 0 600 Amperes Panel Board Ammeter 2
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308017 AB 40 General Electric A C 0 1200 Amperes Panel Board Ammeter
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308 017 Type AB 40S General Electric AC Panel Board Ammeter
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50308017 Type AB40 General Electric AC 0 3000 Amperes Panel Board Ammeter
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50 30916 General Electric AC 0 18kV Kilovolt Panel Meter
50 30916 General Electric AC 0 18kV Kilovolt Panel Meter
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$15.99
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SQUARE D ELECTRIC CIRCUIT PANEL BOX W BREAKERS
$300.00
Time Remaining: 1d 9h 46m

GENERAL ELECTRIC GE AQF3422CBX 225A AMP 120 208V AC DISTRIBUTION PANEL D444865
GENERAL ELECTRIC GE AQF3422CBX 225A AMP 120 208V AC DISTRIBUTION PANEL D444865
$395.00
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GENERAL ELECTRIC GE AQF3422CBX 3 PH 225A AMP 208V AC DISTRIBUTION PANEL D444903
GENERAL ELECTRIC GE AQF3422CBX 3 PH 225A AMP 208V AC DISTRIBUTION PANEL D444903
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GENERAL ELECTRIC GE AQF3422CBX 225A AMP 120 208V AC DISTRIBUTION PANEL D444856
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GE 200X General Electric GE Generator interlock kit 200A Panel Transfer Switch
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