diff --git a/RIGS/migrations/0050_auto_20230520_1520.py b/RIGS/migrations/0050_auto_20230520_1520.py
new file mode 100644
index 00000000..3d39f762
--- /dev/null
+++ b/RIGS/migrations/0050_auto_20230520_1520.py
@@ -0,0 +1,33 @@
+# Generated by Django 3.2.19 on 2023-05-20 14:20
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('RIGS', '0049_auto_20230520_1136'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='powertestrecord',
+            name='fd_earth_fault',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='Earth Fault Loop Impedance (Z<small>S</small>) / Ω', max_digits=6, null=True, verbose_name='Earth Fault Loop Impedance'),
+        ),
+        migrations.AlterField(
+            model_name='powertestrecord',
+            name='w1_earth_fault',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='Earth Fault Loop Impedance (Z<small>S</small>) / Ω', max_digits=6, null=True, verbose_name='Earth Fault Loop Impedance'),
+        ),
+        migrations.AlterField(
+            model_name='powertestrecord',
+            name='w2_earth_fault',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='Earth Fault Loop Impedance (Z<small>S</small>) / Ω', max_digits=6, null=True, verbose_name='Earth Fault Loop Impedance'),
+        ),
+        migrations.AlterField(
+            model_name='powertestrecord',
+            name='w3_earth_fault',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='Earth Fault Loop Impedance (Z<small>S</small>) / Ω', max_digits=6, null=True, verbose_name='Earth Fault Loop Impedance'),
+        ),
+    ]
diff --git a/RIGS/models.py b/RIGS/models.py
index f1d1793d..cc9e6df5 100644
--- a/RIGS/models.py
+++ b/RIGS/models.py
@@ -899,21 +899,21 @@ class PowerTestRecord(ReviewableModel, RevisionMixin):
     fd_voltage_l2 = models.IntegerField(blank=True, null=True, verbose_name="First Distro Voltage L2-N", help_text="L2 - N")
     fd_voltage_l3 = models.IntegerField(blank=True, null=True, verbose_name="First Distro Voltage L3-N", help_text="L3 - N")
     fd_phase_rotation = models.BooleanField(blank=True, null=True, verbose_name="Phase Rotation", help_text="Phase Rotation<br><small>(if required)</small>")
-    fd_earth_fault = models.DecimalField(blank=True, null=True, max_digits=5, decimal_places=2, verbose_name="Earth Fault Loop Impedance", help_text=earth_fault_text)
+    fd_earth_fault = models.DecimalField(blank=True, null=True, max_digits=6, decimal_places=2, verbose_name="Earth Fault Loop Impedance", help_text=earth_fault_text)
     fd_pssc = models.IntegerField(blank=True, null=True, verbose_name="PSCC", help_text=pssc_text)
     # Worst case points
     w1_description = models.CharField(blank=True, default='', max_length=255, help_text="Description")
     w1_polarity = models.BooleanField(blank=True, null=True, help_text="Polarity Checked?")
     w1_voltage = models.IntegerField(blank=True, null=True, help_text="Voltage / V")
-    w1_earth_fault = models.DecimalField(blank=True, null=True, max_digits=5, decimal_places=2, verbose_name="Earth Fault Loop Impedance", help_text=earth_fault_text)
+    w1_earth_fault = models.DecimalField(blank=True, null=True, max_digits=6, decimal_places=2, verbose_name="Earth Fault Loop Impedance", help_text=earth_fault_text)
     w2_description = models.CharField(blank=True, default='', max_length=255, help_text="Description")
     w2_polarity = models.BooleanField(blank=True, null=True, help_text="Polarity Checked?")
     w2_voltage = models.IntegerField(blank=True, null=True, help_text="Voltage / V")
-    w2_earth_fault = models.DecimalField(blank=True, null=True, max_digits=5, decimal_places=2, verbose_name="Earth Fault Loop Impedance", help_text=earth_fault_text)
+    w2_earth_fault = models.DecimalField(blank=True, null=True, max_digits=6, decimal_places=2, verbose_name="Earth Fault Loop Impedance", help_text=earth_fault_text)
     w3_description = models.CharField(blank=True, default='', max_length=255, help_text="Description")
     w3_polarity = models.BooleanField(blank=True, null=True, help_text="Polarity Checked?")
     w3_voltage = models.IntegerField(blank=True, null=True, help_text="Voltage / V")
-    w3_earth_fault = models.DecimalField(blank=True, null=True, max_digits=5, decimal_places=2, verbose_name="Earth Fault Loop Impedance", help_text=earth_fault_text)
+    w3_earth_fault = models.DecimalField(blank=True, null=True, max_digits=6, decimal_places=2, verbose_name="Earth Fault Loop Impedance", help_text=earth_fault_text)
 
     all_rcds_tested = models.BooleanField(blank=True, null=True, help_text="All circuit RCDs tested?<br><small>(using test button)</small>")
     public_sockets_tested = models.BooleanField(blank=True, null=True, help_text="Public/Performer accessible circuits tested?<br><small>(using socket tester)</small>")