According to IS 800 – 1962, the permissible bending stress in a steel slab plate is 1890 kg/cm2.

Explanation:
- The Indian Standard code IS 800 – 1962, titled "Code of Practice for General Construction in Steel", provides guidelines and specifications for the design and construction of steel structures in India.
- The code includes provisions for the allowable stresses in different types of steel members, including slab plates.
- In the case of bending stress in a steel slab plate, the code specifies the permissible value as 1890 kg/cm2.
- Bending stress refers to the stress induced in a material when subjected to an external load or force that causes it to bend or deform.
- The permissible bending stress is the maximum stress that a material can withstand without experiencing permanent deformation or failure.
- The value of 1890 kg/cm2 is determined based on various factors such as the material properties of the steel, the design considerations, and safety factors.
- It is important to adhere to the specified permissible bending stress to ensure the structural integrity and safety of the steel slab plate.
- Deviating from the recommended values may result in structural failure or reduced load-carrying capacity of the steel member.
- Designers and engineers should carefully consider the requirements of IS 800 – 1962 and ensure that the permissible bending stress is not exceeded in the design and construction of steel slab plates.
- It is also worth noting that the Indian Standard code IS 800 – 1962 has been revised several times since its initial publication, and the values specified in the latest edition should be followed for accurate and up-to-date information on permissible bending stress in steel slab plates.

In conclusion, according to IS 800 – 1962, the permissible bending stress in a steel slab plate is 1890 kg/cm2. Designers and engineers should refer to the relevant code and adhere to the specified values to ensure the structural integrity and safety of steel structures.