It's one of those things that gets a bit blurry for very high Anglicans.
The 39 Articles - the definitive statement of Anglican doctrine - says this (I apologise for the polemical tone, but this was written centuries ago and not in the spirit which prevails in this forum!):
"THE Romish Doctrine concerning Purgatory, Pardons, Worshipping, and Adoration, as well of Images as of Reliques, and also invocation of Saints, is a fond thing vainly invented, and grounded upon no warranty of Scripture, but rather repugnant to the Word of God."
(My bold).
Now, two things about Episcopalians; they tend to be more high-church than Anglicans in many other parts of the world, and they no longer require strict adherence to the 39 Articles. Where I had to give my assent on oath to the Articles to be ordained, Episcopal clergy in the United States do not. So they may feel more free to disregard this Article and seek the intercession of the saints.
For me, it is completely and unequivocally out of bounds.