The spacing of main bars in R.C. slab should not exceed : 

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UKPSC JE Civil 8 May 2022 Official Paper-I
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  1. 250 mm or 2d whichever is lesser 
  2. 350 mm or 3d whichever is lesser
  3. 300 mm or 3d whichever is lesser 
  4. 450 mm or 4d whichever is lesser 

Answer (Detailed Solution Below)

Option 3 : 300 mm or 3d whichever is lesser 
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UKPSC JE CE Full Test 1 (Paper I)
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Detailed Solution

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Concept:

According to IS 456:2000, Cl. 26.3.3(b)

The horizontal distance between parallel main bars shall not be more than:

Minimum of (3d, 300mm)  d = effective depth.

The horizontal distance between parallel distribution bars shall not be more than:

Minimum of (5d, 300mm)

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