Do companies require separate Employee Relations Department apart from HR department?

Thanks 

Employees relation should apart from HR 

Basis on the volume of employees and the size of the company its is a must to have a ER department to maintain the smooth balance between HR and Administration......and to motivate or understand employees

No,ER should be under HR department only

this HR function as this Department deals with all staff from date of joining till end of the contract

ER IS A SMALL UNIT OF HR DEPT IN MOST ORGANISATIONS AND IS ANSWERABLE TO MANAGER HR.

Thank you for the invitation

I agree with colleagues answer

It should be the part of HR function that will help and more effective, not only for resolution of day to day matter but may incorporate solutions for future planning.