An important read for anyone wondering about your external wallets
Ledger Nano S :
https://blog.ledger.co/securing-your-free-bitcoin-cash-stash-d50aff765688
Trezor :
https://blog.trezor.io/bitcoin-cash-hard-fork-chain-split-safe-guide-abbe3e9c553f
Bottom line is you are safe if your BTC are in your private key wallets...and as Ledger says, the BCC developers hard fork folk are "airdropping" free BCC. Claim yours.
Coinbase and other will not recognize Bitcoin Cash, ABC, BCC