diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Shared/Uns/ImportEquipmentModal.razor b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Shared/Uns/ImportEquipmentModal.razor
index 3a4420b1..86da0727 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Shared/Uns/ImportEquipmentModal.razor
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Shared/Uns/ImportEquipmentModal.razor
@@ -75,8 +75,6 @@
 }
 
 @code {
-    // Required, in order. v3: equipment no longer binds a driver, so DriverInstanceId is gone.
-    private static readonly string[] RequiredColumns = ["Name", "MachineCode", "UnsLineId"];
 
     /// <summary>Whether the modal is shown. The host owns this flag.</summary>
     [Parameter] public bool Visible { get; set; }
@@ -134,60 +132,12 @@
     private Task CloseAsync() =>
         _result is not null ? OnImported.InvokeAsync() : OnCancel.InvokeAsync();
 
-    /// <summary>
-    /// Parses the pasted CSV into <see cref="EquipmentInput"/> rows. Requires a header row whose first
-    /// three columns are Name, MachineCode, UnsLineId (case-insensitive); the optional
-    /// ZTag/SAPID/Manufacturer/Model follow. Blank optional cells parse as <c>null</c>. Returns
-    /// <c>null</c> (and sets <see cref="_parseError"/>) when the CSV is empty or the header is wrong.
-    /// </summary>
+    /// <summary>Parses the pasted CSV via <see cref="EquipmentCsvParser"/> (RFC 4180, R04 S6); sets
+    /// <see cref="_parseError"/> and returns null on an empty/malformed CSV or a wrong header.</summary>
     private List<EquipmentInput>? ParseCsv(string csv)
     {
-        if (string.IsNullOrWhiteSpace(csv)) { _parseError = "CSV is empty."; return null; }
-
-        var lines = csv.Replace("\r\n", "\n").Split('\n', StringSplitOptions.RemoveEmptyEntries);
-        if (lines.Length < 2) { _parseError = "Need a header row and at least one data row."; return null; }
-
-        var header = lines[0].Split(',').Select(c => c.Trim()).ToArray();
-        for (var i = 0; i < RequiredColumns.Length; i++)
-        {
-            if (i >= header.Length || !string.Equals(header[i], RequiredColumns[i], StringComparison.OrdinalIgnoreCase))
-            {
-                _parseError = $"Header column #{i + 1} must be '{RequiredColumns[i]}' (got '{(i < header.Length ? header[i] : "")}').";
-                return null;
-            }
-        }
-
-        var rows = new List<EquipmentInput>();
-        for (var lineIdx = 1; lineIdx < lines.Length; lineIdx++)
-        {
-            // NOTE: simple comma split — no RFC4180 quoting; values with commas are not supported.
-            var parts = lines[lineIdx].Split(',').Select(c => c.Trim()).ToArray();
-            if (parts.Length < RequiredColumns.Length)
-            {
-                _parseError = $"Row {lineIdx}: too few columns (got {parts.Length}, need {RequiredColumns.Length}).";
-                return null;
-            }
-
-            rows.Add(new EquipmentInput(
-                Name: parts[0],
-                MachineCode: parts[1],
-                UnsLineId: parts[2],
-                ZTag: NullIfEmpty(parts, 3),
-                SAPID: NullIfEmpty(parts, 4),
-                Manufacturer: NullIfEmpty(parts, 5),
-                Model: NullIfEmpty(parts, 6),
-                SerialNumber: null,
-                HardwareRevision: null,
-                SoftwareRevision: null,
-                YearOfConstruction: null,
-                AssetLocation: null,
-                ManufacturerUri: null,
-                DeviceManualUri: null,
-                Enabled: true));
-        }
+        var (rows, error) = EquipmentCsvParser.Parse(csv);
+        _parseError = error;
         return rows;
     }
-
-    private static string? NullIfEmpty(string[] parts, int idx) =>
-        idx < parts.Length && !string.IsNullOrWhiteSpace(parts[idx]) ? parts[idx] : null;
 }
diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/EquipmentCsvParser.cs b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/EquipmentCsvParser.cs
new file mode 100644
index 00000000..f3b44e68
--- /dev/null
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/EquipmentCsvParser.cs
@@ -0,0 +1,85 @@
+using ZB.MOM.WW.OtOpcUa.Commons.Csv;
+
+namespace ZB.MOM.WW.OtOpcUa.AdminUI.Uns;
+
+/// <summary>
+///     Parses the equipment-import CSV (R04 S6). It used to be a naive comma split, so a quoted
+///     <c>Manufacturer</c> containing a comma silently shifted every later column with no error. It now
+///     reads through the RFC 4180 <see cref="CsvParser"/> — the same authority the raw-tag importer uses —
+///     so quoted fields, embedded commas/newlines and doubled quotes parse correctly, and malformed quoting
+///     is reported instead of guessed at.
+/// </summary>
+public static class EquipmentCsvParser
+{
+    /// <summary>The leading header columns the import requires, in order (case-insensitive).</summary>
+    public static readonly IReadOnlyList<string> RequiredColumns = ["Name", "MachineCode", "UnsLineId"];
+
+    /// <summary>
+    ///     Parses the CSV. Requires a header row whose first three columns are Name, MachineCode, UnsLineId;
+    ///     the optional ZTag, SAPID, Manufacturer, Model follow. Cells are trimmed; blank optional cells parse
+    ///     as null; blank lines are skipped.
+    /// </summary>
+    /// <param name="csv">The pasted CSV text.</param>
+    /// <returns>The rows, or a null list with an operator-facing error.</returns>
+    public static (List<EquipmentInput>? Rows, string? Error) Parse(string? csv)
+    {
+        if (string.IsNullOrWhiteSpace(csv)) return (null, "CSV is empty.");
+
+        IReadOnlyList<string[]> records;
+        try
+        {
+            records = CsvParser.Parse(csv);
+        }
+        catch (FormatException ex)
+        {
+            return (null, $"The CSV is malformed: {ex.Message}");
+        }
+
+        var lines = records
+            .Where(r => r.Length > 1 || r[0].Trim().Length > 0)
+            .Select(r => r.Select(c => c.Trim()).ToArray())
+            .ToList();
+        if (lines.Count < 2) return (null, "Need a header row and at least one data row.");
+
+        var header = lines[0];
+        for (var i = 0; i < RequiredColumns.Count; i++)
+        {
+            if (i >= header.Length || !string.Equals(header[i], RequiredColumns[i], StringComparison.OrdinalIgnoreCase))
+            {
+                return (null, $"Header column #{i + 1} must be '{RequiredColumns[i]}' (got '{(i < header.Length ? header[i] : "")}').");
+            }
+        }
+
+        var rows = new List<EquipmentInput>(lines.Count - 1);
+        for (var lineIdx = 1; lineIdx < lines.Count; lineIdx++)
+        {
+            var parts = lines[lineIdx];
+            if (parts.Length < RequiredColumns.Count)
+            {
+                return (null, $"Row {lineIdx}: too few columns (got {parts.Length}, need {RequiredColumns.Count}).");
+            }
+
+            rows.Add(new EquipmentInput(
+                Name: parts[0],
+                MachineCode: parts[1],
+                UnsLineId: parts[2],
+                ZTag: NullIfEmpty(parts, 3),
+                SAPID: NullIfEmpty(parts, 4),
+                Manufacturer: NullIfEmpty(parts, 5),
+                Model: NullIfEmpty(parts, 6),
+                SerialNumber: null,
+                HardwareRevision: null,
+                SoftwareRevision: null,
+                YearOfConstruction: null,
+                AssetLocation: null,
+                ManufacturerUri: null,
+                DeviceManualUri: null,
+                Enabled: true));
+        }
+
+        return (rows, null);
+    }
+
+    private static string? NullIfEmpty(string[] parts, int idx) =>
+        idx < parts.Length && !string.IsNullOrWhiteSpace(parts[idx]) ? parts[idx] : null;
+}
diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/EquipmentCsvParserTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/EquipmentCsvParserTests.cs
new file mode 100644
index 00000000..d1b2c65c
--- /dev/null
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/EquipmentCsvParserTests.cs
@@ -0,0 +1,62 @@
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.OtOpcUa.AdminUI.Uns;
+
+namespace ZB.MOM.WW.OtOpcUa.AdminUI.Tests.Uns;
+
+/// <summary>R04 S6: the equipment CSV import reads RFC 4180 through the shared CsvParser.</summary>
+[Trait("Category", "Unit")]
+public sealed class EquipmentCsvParserTests
+{
+    private const string Header = "Name,MachineCode,UnsLineId,ZTag,SAPID,Manufacturer,Model";
+
+    [Fact]
+    public void A_quoted_comma_stays_in_its_column()
+    {
+        var (rows, error) = EquipmentCsvParser.Parse(
+            Header + "\nPress 1,MC-1,LINE-1,Z1,S1,\"Acme, Inc.\",X200\n");
+
+        error.ShouldBeNull();
+        rows!.Single().Manufacturer.ShouldBe("Acme, Inc.");
+        // The column after the quoted comma did not shift.
+        rows!.Single().Model.ShouldBe("X200");
+    }
+
+    [Fact]
+    public void Doubled_quotes_crlf_and_blank_lines_parse()
+    {
+        var (rows, error) = EquipmentCsvParser.Parse(
+            Header + "\r\n\r\n\"Press \"\"A\"\"\",MC-1,LINE-1,,,,\r\nPress B,MC-2,LINE-1\r\n");
+
+        error.ShouldBeNull();
+        rows!.Select(r => r.Name).ShouldBe(["Press \"A\"", "Press B"]);
+        rows![0].ZTag.ShouldBeNull();
+        rows[1].Manufacturer.ShouldBeNull();
+    }
+
+    [Fact]
+    public void Header_and_shape_errors_are_reported()
+    {
+        EquipmentCsvParser.Parse("").Error.ShouldBe("CSV is empty.");
+        EquipmentCsvParser.Parse(Header).Error.ShouldBe("Need a header row and at least one data row.");
+        EquipmentCsvParser.Parse("Name,Code,UnsLineId\na,b,c").Error!.ShouldContain("Header column #2 must be 'MachineCode'");
+        EquipmentCsvParser.Parse(Header + "\nonly,two").Error!.ShouldContain("Row 1: too few columns");
+    }
+
+    [Fact]
+    public void Malformed_quoting_is_an_error_not_a_guess()
+    {
+        var (rows, error) = EquipmentCsvParser.Parse(Header + "\nPress,MC-1,LINE-1,\"unterminated\n");
+
+        rows.ShouldBeNull();
+        error!.ShouldStartWith("The CSV is malformed:");
+    }
+
+    [Fact]
+    public void Modal_delegates_to_the_parser()
+    {
+        var src = AdminUiSource.Read("Components", "Shared", "Uns", "ImportEquipmentModal.razor");
+        src.ShouldContain("EquipmentCsvParser.Parse(csv)");
+        src.ShouldNotContain(".Split(',')");
+    }
+}