Hi

I had few pre fork BTC which I moved to electrum before Aug 1st and then later back to exchange after Aug 1st.

Since BCH extraction was thought to be putting BTC also at risk, I didnt do much about it. Now that BCH seems already established and growing, would like to try it out.

As per electrum website, below are the steps given.

1. Install Electron Cash on a machine that does not have your
 Electrum wallets.

 2. Wait until the BCC hard fork has taken place, and a few BCC blocks
 have been mined.

 3. Move all your Electrum funds to a new Electrum wallet. This will
 move only your BTC, and not your BCC, because the BCC blockchain has
 replay protection. Wait until the transaction is confirmed.

 4. Enter the seed of your (now empty) old wallet or private keys in
 Electron Cash. Since the BTC have been moved to a new wallet,
 entering your old seed in Electron Cash will not put your BTC funds
 at risk.

In that 3rd step, instead of electrum wallet, it is now an exchange. In that case, still I could be able to extract BCH? Below is what I intend to do

1. Install electron cash in new machine (though old machine with electrum does not have any any more BTC)
2. Enter the seed of old wallet in electron cash. Now will I get BCH? More than that, will it any way affect BTC which had been moved to exchange already?

Exchange told me, they could only provide BCH for pre fork BTC which was already in exchange during the fork. Thats y for pre fork BTC in electrum which had been sent to exchange, i am on my own.

Kindly clarify.