Timber classification in the 70s - T 200?

[Bele]

I'm sitting with building plans for a house built in 1972. The joist is specified as class T 200 with dimensions 50*195. Does anyone know what type of timber class this corresponds to in terms of strength in today's terminology?

 

[anaitis]

The nearest class is C18

 

[Bele]

Thank you for the information!
I have searched the internet without getting any results. What else might be available regarding the strength values in writing?

Is C18 the closest higher strength class in today's system? The old ones are sawn 195*50 so if I choose 195*45 it might be on the lower side?

 

[anaitis]

No, it's closer to lower!
Without looking at the table, I don't remember if the next class one step up is called C22 or C24.
So choose a one step higher class for the timber if you need to replace any part.