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(1) This account shall include the cost of materials purchased primarily for use in construction, operations or maintenance, such as shop material, articles in process of fabrication by the accounting company, spare parts, fittings, valves, appliances, line pipe and other supplies but shall not include materials properly includable in account 115 (Gas Plant Under Construction) or account 102 (Gas Plant Held for Future Use).
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(3) Materials and supplies issued shall be credited to this account and concurrently debited to the appropriate construction, operating or maintenance expense account on the basis of a unit price, determined by the use of cumulative average, first in-first out, or such other method of inventory accounting as conforms with accepted accounting practices consistently applied.
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(4) Material recovered in connection with construction, maintenance work or the replacement or demolition of plant and classified as reusable shall be debited to this account at its original cost, estimated if not known, and credited to the appropriate maintenance, construction or accumulated depreciation account.
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(5) Material recovered in connection with construction, maintenance work or the replacement or demolition of plant and classified as scrap shall be debited to this account on the basis of its fair and reasonable value and credited to the appropriate maintenance, construction or accumulated depreciation account.