2003 IRC
2420.4 Manufacturer's instructions. The product shall be installed in accordance with the manufacturer's installation instructions.

Section E3808 Grounding
E3808.1 Metal enclosures. Metal enclosures of conductors, devices and equipment shall be grounded.

E3802.2Equipment...
2. Where located in a wet or damp location and not isolated...

E3808.3 Specific equipment fastened in place or connected by permanent wiring methods.
Exposed non-current-carrying metal parts of the following equipment and enclosures shall be grounded:
1. Luminaires...
2. Motor-operated water pumps...

I have seen flexible cord connected pumps that are not metal, that do not have a separate grounding lug, but are grounded through the corded connection, but if I see a grounding lug on a pump casing, it needs a #8 conductor back to the equipment ground. I take it that if the manufacturer provides a grounding lug, it is supposed to be used.

But then, I get to see very few pumps since they almost never provide an access panel that you can open without damage to the finishes. I understand this is changed to provide ready access in the newest codes. I am looking forward to the changes.

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Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002