My understanding is that EC doesn't affect Encumbrance, that it is calculated prior to anything being cast. However the wiki says:
With the introduction of Encumbrance, EC has a wider effect on both Tanks and Mages. Evasion, DX, ST, AC and DD damage are directly affected by encumbrance and, as EC affects ST, it manipulates encumbrance to affect a heavily armored tank, wall or mage.
Is that correct? A big EC will blow up a tank's encumbrance to the point they can't do anything?