S.C. Code Ann. Regs. 117-301.8
Sales of building material, supplies, fixture, and equipment used in the construction, repair, or improvement a commercial housing of poultry or livestock, or that becomes part of a self-contained enclosure or structure designed, constructed and used for the commercial housing of poultry or livestock, are exempt under Code Section 12-36-2120(45).
This exemption applies to:
(c) watering tubs, feed troughs, and hay feeders placed within a fenced in area specifically set aside and used for livestock or poultry, provided the livestock and poultry within the enclosure are being raised or maintained for commercial purposes.
The exemption does not apply to fencing and fencing supplies used to surround a field where crops are grown.