Help for awg.view_cable_finder

def view_cable_finder(
    *, meters=None, amps="40", volts="220", material="cu", 
    max_lines="3", phases="1", conduit=None, neutral="0", **kwargs
):
    """Page builder for AWG cable finder with HTML form and result."""
    # TODO: Add a image with the sponsor logo on the right side of the result page
    if not meters:
        return '''<h1>AWG Cable Finder</h1>
            <form method="post">
                <label>Meters: <input type="number" name="meters" required min="1" /></label><br/>
                <label>Amps: <input type="number" name="amps" value="40" /></label><br/>
                <label>Volts: <input type="number" name="volts" value="220" /></label><br/>
                <label>Material: 
                    <select name="material">
                        <option value="cu">Copper (cu)</option>
                        <option value="al">Aluminum (al)</option>
                    </select>
                </label><br/>
                <label>Phases: 
                    <select name="phases">
                        <option value="2">AC Two Phases (2)</option>
                        <option value="1">AC Single Phase (1)</option>
                        <option value="3">AC Three Phases (3)</option>
                    </select>
                </label><br/>
                <label>Max Lines: <input type="number" name="max_lines" value="1" /></label><br/>
                <button type="submit" class="submit">Find Cable</button>
            </form>
        '''
    try:
        result = find_cable(
            meters=meters, amps=amps, volts=volts,
            material=material, max_lines=max_lines, phases=phases, 
        )
    except Exception as e:
        return f"<p class='error'>Error: {e}</p><p><a href='/awg/cable-finder'>&#8592; Try again</a></p>"

    if result.get("awg") == "n/a":
        return """
            <h1>No Suitable Cable Found</h1>
            <p>No cable was found that meets the requirements within a 3% voltage drop.<br>
            Try adjusting the <b>cable size, amps, length, or material</b> and try again.</p>
            <p><a href="/awg/cable-finder">&#8592; Calculate again</a></p>
        """

    return f"""
        <h1>Recommended Cable</h1>
        <ul>
            <li><strong>AWG Size:</strong> {result['awg']}</li>
            <li><strong>Lines:</strong> {result['lines']}</li>
            <li><strong>Total Cables:</strong> {result['cables']}</li>
            <li><strong>Total Length (m):</strong> {result['total_meters']}</li>
            <li><strong>Voltage Drop:</strong> {result['vdrop']:.2f} V ({result['vdperc']:.2f}%)</li>
            <li><strong>Voltage at End:</strong> {result['vend']:.2f} V</li>
        </ul>
        <p>
        <em>Special thanks to the expert electrical engineers at <strong>
        <a href="https://www.gelectriic.com">Gelectriic Solutions</a></strong> for their 
        useful input and support while creating this calculator.</em>
        </p>
        <p><a href="/awg/cable-finder">&#8592; Calculate again</a></p>
    """