Drain size for upstairs laundry emergency drain to outside?

[Ramias]

Planning to run a second floor laundry emergency drain with its own line parallel to attic HVAC condensate line to same floor drain in basement foundation.

Is one inch PVC sufficient or should I do more? HVAC condensate line is 3/4. This is just for emergency and separately I’ll have the Watts shutoff system as well. Planning on a metal pan not a dedicated washing machine curb but could do that too. Thanks

 

[Jeff H Young]

typical pan is 1 inch drain

 

[Sponsor]

 

[Ramias]

perfect. Thank you for confirming.

 

[Ramias]

Does anybody know if this is allowed per code? Laundry EMERGENCY floor drain direct to outside (basement foundation drain; same one used by HVAC condensate lines) without dealing with a trap primer?