Cast when damage taken 2 in one link?

If I have 2 cast when damage taken in one link will they both trigger the spell so basically I cast twice or do they need to be in separate links for them to work. An example would be a 3l RRB gloves running level 1 cast on damage taken, another cast on damage taken level 1 and then a level 1 fireball. Would it shoot out 2 fireballs then

Gems supported by 2 or more trigger effects are disabled. So 2 cwdt gems in 1 link disables the whole setup.

You're also limited in gem level, CWDT at low level (triggers more often) can only support low level gems, AND has a 70% LESS damage modifier applied to the gem it's linked to. It's better to link it to things like Immortal Call, Phase Run, Temporal Chains / Enfeeble, Frost Wall. These give you some extra defense when you take damage.

Level 1 Cwdt requires you to take 530 damage. This is fairly minimal and you can get it to trigger pretty consistently. This can support up to level 38 gems (level 3 immortal call, level 3 phase run, level 5 temp chains)