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    <url>
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        <lastmod>2026-06-16</lastmod>
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        <priority>0.65</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/duct-sizing-guide"/>
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    <url>
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        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.60</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/radiator-sizing-guide"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/guides/ja/pipe-flow-guide</loc>
        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.60</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/pipe-flow-guide"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/guides/ja/pump-head-guide</loc>
        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.60</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/pump-head-guide"/>
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    <url>
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        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.60</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/pipe-insulation-guide"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/guides/boiler-sizing-guide</loc>
        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/guides/cn/boiler-sizing-guide"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/guides/expansion-tank-sizing-guide</loc>
        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/guides/cn/expansion-tank-sizing-guide"/>
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    </url>
    <url>
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        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.65</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/guides/cn/hvac-unit-converter-guide"/>
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    </url>
    <url>
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        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.60</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/boiler-sizing-guide"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/guides/cn/expansion-tank-sizing-guide</loc>
        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.60</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/expansion-tank-sizing-guide"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/guides/cn/hvac-unit-converter-guide</loc>
        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.55</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/hvac-unit-converter-guide"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/guides/ja/boiler-sizing-guide</loc>
        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.60</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/boiler-sizing-guide"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/guides/cn/boiler-sizing-guide"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/guides/ja/expansion-tank-sizing-guide</loc>
        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.60</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/expansion-tank-sizing-guide"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/guides/cn/expansion-tank-sizing-guide"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/guides/ja/hvac-unit-converter-guide</loc>
        <lastmod>2026-06-16</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.55</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/guides/hvac-unit-converter-guide"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/guides/cn/hvac-unit-converter-guide"/>
    </url>

    <!-- Electrical: amps-to-watts -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/amps-to-watts</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/amps-to-watts"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/amps-to-watts</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/amps-to-watts"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/amps-to-watts</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
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        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/amps-to-watts"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/amps-to-watts"/>
    </url>
    <!-- Electrical Calculator URLs -->
    <!-- Electrical: ohms-law -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/ohms-law</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/ohms-law"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/ohms-law</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/ohms-law"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/ohms-law"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/ohms-law</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/ohms-law"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/ohms-law"/>
    </url>
    <!-- Electrical: watts-to-amps -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/watts-to-amps</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/watts-to-amps"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/watts-to-amps</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/watts-to-amps"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/watts-to-amps"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/watts-to-amps</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/watts-to-amps"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/watts-to-amps"/>
    </url>
    <!-- Electrical: awg-to-mm2 -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/awg-to-mm2</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/awg-to-mm2"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/awg-to-mm2"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/awg-to-mm2</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/awg-to-mm2"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/awg-to-mm2"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/awg-to-mm2</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/awg-to-mm2"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/awg-to-mm2"/>
    </url>
    <!-- Electrical: capacitor-code -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/capacitor-code</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/capacitor-code"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/capacitor-code</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/capacitor-code"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/capacitor-code</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/capacitor-code"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/capacitor-code"/>
    </url>
    <!-- Electrical: resistance -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/resistance</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/resistance"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/resistance"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/resistance</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/resistance"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/resistance"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/resistance</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/resistance"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/resistance"/>
    </url>
    <!-- Electrical: energy -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/energy</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/energy"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/energy</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/energy"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/energy"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/energy</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/energy"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/energy"/>
    </url>
    <!-- Electrical: hp-to-kw -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/hp-to-kw</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/hp-to-kw"/>
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    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/hp-to-kw</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/hp-to-kw"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/hp-to-kw"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/hp-to-kw</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/hp-to-kw"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/hp-to-kw"/>
    </url>
    <!-- Electrical: rc-time-constant -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/rc-time-constant</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/rc-time-constant"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/rc-time-constant"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/rc-time-constant</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/rc-time-constant"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/rc-time-constant"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/rc-time-constant</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/rc-time-constant"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/rc-time-constant"/>
    </url>
    <!-- Electrical: voltage-divider -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/voltage-divider</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/voltage-divider"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/voltage-divider"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/voltage-divider</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/voltage-divider"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/voltage-divider"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/voltage-divider</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/voltage-divider"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/voltage-divider"/>
    </url>
    <!-- Electrical: electricity-cost -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/electricity-cost</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/electricity-cost"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/electricity-cost"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/electricity-cost</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/electricity-cost"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/electricity-cost"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/ja/electricity-cost</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/electricity-cost"/>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/electricity-cost"/>
    </url>
    <!-- Electrical: lumen -->
    <url>
        <loc>https://hvaccalcpro.com/calculators/lumen</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.80</priority>
        <xhtml:link rel="alternate" hreflang="zh" href="https://hvaccalcpro.com/calculators/cn/lumen"/>
        <xhtml:link rel="alternate" hreflang="ja" href="https://hvaccalcpro.com/calculators/ja/lumen"/>
    </url>
    <url>
        <loc>https://hvaccalcpro.com/calculators/cn/lumen</loc>
        <lastmod>2026-06-18</lastmod>
        <changefreq>yearly</changefreq>
        <priority>0.70</priority>
        <xhtml:link rel="alternate" hreflang="en" href="https://hvaccalcpro.com/calculators/lumen"/>
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    <!-- Electrical: insulation-resistance -->
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    <!-- Electrical: offset-bend -->
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    <!-- Electrical: power -->
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    <!-- Electrical: voltage-drop -->
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    <!-- Electrical: transformer -->
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    <!-- Electrical: power-factor-correction -->
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    <!-- Electrical: motor-current -->
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    <!-- Electrical: breaker-sizing -->
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    <!-- Electrical: ampacity -->
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    <!-- Electrical: wire-size -->
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