a friend has given me some cable hes had in his shed for a while.its draka ft30 can I use this?there doesn't appear to be any sheathing on the earth cable is this a problem?
This isn't typical cable for this application, this is usually fire alarm, emergency lighting cable etc... Is it solid or stranded cable? Did you really mean rewiring the ring main or are you just adding a socket somewhere? If rewiring, then by your opening post this is not a job for you.
Again this really isn't the right/common stuff for domestic installations. Do you know if this stuff is 1.5mm, 2.5mm or 4mm? Assuming its latest colour code blue+brown? What's the reason you are rewiring? You will probably find this stuff is not so easily passed through joists, around bends, into back boxes as T&E.
Using this stuff, assuming you at most have a 50m drum is only going to save you ~£30. If you was getting help from an electrician they would probably advise for/against this stuff, also this is notifiable work that also requires testing/sign off.
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