When the balance shown in balance sheet account No. 319, "Depreciation Reserve," is less than is necessary to provide for the retirement of property no longer used or useful in the conduct of the company's business, and for losses in value due to wear and tear not covered by current repairs, the company may charge this account and concurrently credit balance sheet account No. 319, "Depreciation Reserve," with such amounts as shall be deemed necessary to cover such deficiency.
220 CMR, 52.415