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What is the correct Depth dimension for Nema 3R/12 NQ Panelboard enclosures? Is it 6.5'' deep per Digest 176 , Page 9-7 , or 6.25" per the Engineering drawing PBA711 ?

Engineering drawing PBA711 shows Depth of MH**WP box as 6.25",  and the 176 Digest lists the MH**WP panel box as 6.5"D , which is correct?

Product Line:
NQ Panelboards

Plant Engineering drawings

Clarification of Plant Engineering drawings

The 6.25"D represented on Drawing PBA711 is is correct if measuring from inside backbox to the inside of the front trim. The Digest 's 6.50" D represents measurements taken from the outside back of the box to outside trim/Door , thus the .25" Depth descrepancy

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