The causes of sparking of commutator segments are:
(i) Shorted armature.
(ii) High Mica.
(iii) Worn-out Brushes.
(iv) Dirty Commutator.
(v) Armature Reaction.
(vi) Overloading.
(vii) Wrong position of brushes.
(viii) Earthed armature coil.
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