Depretiation

Please Provide me, Use ful life of Electric Transformer which was claimed in income tax act. at present we are sale out an transformer purchase dtd:27/12/03 rs. 955000/- the depretiation method is SLM.

Please guide me how we are manage its to Excise Purpose & Income Tax purpose if we sale its. becouse its capical itmes, can we are sales its in scrap forms at current market rate.