diff --git a/RIGS/migrations/0042_auto_20211007_2338.py b/RIGS/migrations/0042_auto_20211007_2338.py
new file mode 100644
index 00000000..20343cdf
--- /dev/null
+++ b/RIGS/migrations/0042_auto_20211007_2338.py
@@ -0,0 +1,34 @@
+# Generated by Django 3.1.13 on 2021-10-07 22:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('RIGS', '0041_auto_20210302_1204'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='eventchecklist',
+            name='fd_earth_fault',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='Earth Fault Loop Impedance (Z<small>S</small>)', max_digits=5, null=True, verbose_name='Earth Fault Loop Impedance'),
+        ),
+        migrations.AlterField(
+            model_name='eventchecklist',
+            name='w1_earth_fault',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='Earth Fault Loop Impedance (Z<small>S</small>)', max_digits=5, null=True, verbose_name='Earth Fault Loop Impedance'),
+        ),
+        migrations.AlterField(
+            model_name='eventchecklist',
+            name='w2_earth_fault',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='Earth Fault Loop Impedance (Z<small>S</small>)', max_digits=5, null=True, verbose_name='Earth Fault Loop Impedance'),
+        ),
+        migrations.AlterField(
+            model_name='eventchecklist',
+            name='w3_earth_fault',
+            field=models.DecimalField(blank=True, decimal_places=2, help_text='Earth Fault Loop Impedance (Z<small>S</small>)', max_digits=5, null=True, verbose_name='Earth Fault Loop Impedance'),
+        ),
+    ]
+
diff --git a/RIGS/models.py b/RIGS/models.py
index 55800808..4687c9b3 100644
--- a/RIGS/models.py
+++ b/RIGS/models.py
@@ -796,21 +796,21 @@ class EventChecklist(models.Model, 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.IntegerField(blank=True, null=True, verbose_name="Earth Fault Loop Impedance", help_text="Earth Fault Loop Impedance (Z<small>S</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 Loop Impedance (Z<small>S</small>)")
     fd_pssc = models.IntegerField(blank=True, null=True, verbose_name="PSCC", help_text="Prospective Short Circuit Current")
     # 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")
-    w1_earth_fault = models.IntegerField(blank=True, null=True, help_text="Earth Fault Loop Impedance (Z<small>S</small>)")
+    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 Loop Impedance (Z<small>S</small>)")
     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")
-    w2_earth_fault = models.IntegerField(blank=True, null=True, help_text="Earth Fault Loop Impedance (Z<small>S</small>)")
+    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 Loop Impedance (Z<small>S</small>)")
     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")
-    w3_earth_fault = models.IntegerField(blank=True, null=True, help_text="Earth Fault Loop Impedance (Z<small>S</small>)")
+    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 Loop Impedance (Z<small>S</small>)")
 
     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>")
diff --git a/RIGS/tests/test_interaction.py b/RIGS/tests/test_interaction.py
index 3192ad12..dc50fd93 100644
--- a/RIGS/tests/test_interaction.py
+++ b/RIGS/tests/test_interaction.py
@@ -721,12 +721,12 @@ def test_ec_create_medium(logged_in_browser, live_server, admin_user, medium_ra)
     page.fd_voltage_l2 = 235
     page.fd_voltage_l3 = 0
     page.fd_phase_rotation = True
-    page.fd_earth_fault = 666
+    page.fd_earth_fault = "1.21"
     page.fd_pssc = 1984
     page.w1_description = "In the carpark, by the bins"
     page.w1_polarity = True
     page.w1_voltage = 240
-    page.w1_earth_fault = 333
+    page.w1_earth_fault = "0.42"
 
     page.submit()
     assert page.success