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-For indoor,40mm
-Outdoor,50mm
-Under FGL level with direct contact to soil,75mm
Nominal Clear cover for slab depends upon the exposure conditions
1.Mild
2.Moderate
3.Severe
4.Very severe and
5.Extreme.
Nominal cover for slabs in Mild Exposure Conditions is20mm and can go up to75mm for Extreme Conditions
incase of fire resistant structures it will vary as per end conditions(simply supported slab or continous slab) ranges between20-55mm as per Indian standard codes
However more cover assures more durability of Structure.
is40mm ..