diff --git a/src/modality-specific-files/electroencephalography.md b/src/modality-specific-files/electroencephalography.md
index 6ba02cc1..8a584bb7 100644
--- a/src/modality-specific-files/electroencephalography.md
+++ b/src/modality-specific-files/electroencephalography.md
@@ -308,6 +308,12 @@ and a guide for using macros can be found at
 -->
 {{ MACROS___make_columns_table("eeg.EEGElectrodes") }}
 
+`*_electrodes.tsv` files SHOULD NOT be duplicated for each data file,
+for example, during multiple runs of a task.
+The [inheritance principle](../common-principles.md#the-inheritance-principle) MUST
+be used to find the appropriate electrode positions for a given data file.
+If electrodes are repositioned, it is RECOMMENDED to use multiple sessions to indicate this.
+
 ### Example `*_electrodes.tsv`
 
 See also the corresponding [`electrodes.tsv` example](#example-channelstsv).
diff --git a/src/modality-specific-files/intracranial-electroencephalography.md b/src/modality-specific-files/intracranial-electroencephalography.md
index ae6a669a..096b96f9 100644
--- a/src/modality-specific-files/intracranial-electroencephalography.md
+++ b/src/modality-specific-files/intracranial-electroencephalography.md
@@ -349,6 +349,12 @@ and a guide for using macros can be found at
 -->
 {{ MACROS___make_columns_table("ieeg.iEEGElectrodes") }}
 
+`*_electrodes.tsv` files SHOULD NOT be duplicated for each data file,
+for example, during multiple runs of a task.
+The [inheritance principle](../common-principles.md#the-inheritance-principle) MUST
+be used to find the appropriate electrode positions for a given data file.
+If electrodes are repositioned, it is RECOMMENDED to use multiple sessions to indicate this.
+
 ### Example `*_electrodes.tsv`
 
 ```Text
diff --git a/src/schema/rules/checks/electrodes.yaml b/src/schema/rules/checks/electrodes.yaml
new file mode 100644
index 00000000..29f81d3d
--- /dev/null
+++ b/src/schema/rules/checks/electrodes.yaml
@@ -0,0 +1,15 @@
+---
+ElectrodeSpecificity:
+  issue:
+    code: EXCESSIVE_ELECTRODE_SPECIFICITY
+    message: |
+      Run or acquisition entities detected in electrodes.tsv.
+      Electrode definitions should generally not vary within a session.
+      Consider creating a new session each time electrodes are reconfigured.
+    level: warning
+  selectors:
+    - suffix == 'electrodes'
+    - extension == '.tsv'
+  checks:
+    - '!("run" in entities)'
+    - '!("acquisition" in entities)'
diff --git a/src/schema/rules/files/raw/channels.yaml b/src/schema/rules/files/raw/channels.yaml
index 06c213be..25aa1def 100644
--- a/src/schema/rules/files/raw/channels.yaml
+++ b/src/schema/rules/files/raw/channels.yaml
@@ -70,6 +70,7 @@ electrodes:
     subject: required
     session: optional
     acquisition: optional
+    run: optional
     space: optional
 
 # MEG has an additional entity available