Salary Components [Thread 265125]

Dear All,
Is there any fixed ratio between the CTC and different Salary Components.
Does it vary from company to company. Legally is there any binding for maintaining the ratio or number of components.
As an example
Total CTC : HRA = 1 : X
Total CTC : TA = 1 : Y
Total CTC : Basic = 1 : Z
Kindly help me with all the Components Individual Ratio against the Total CTC.
I will be really thankful.
Santanu Mazumdar

Basic : Retain at 50% of Monthly Gross
HRA : Retain at 50% of Basic as HRA in non metro else 60% of Basic as HRA in Metro - will get maximum exemption under IT
Conveyance: Fixed Rs.800/- as it is the maximum exemption under IT
Medical Reimbursement: Fixed Rs.1,250/- as it the maximum exemption under IT
LTA: Retain at 8.33% of Basic as LTA
Meal voucher: Upper limite be Rs.3000/- (have slabs based on annual income)
Balance put it under the other allowance (which will be taxable)