Dry Type Transformers. Accessories and Lugs. Single-Phase and Three-Phase. Lug Kits for QL Transformers. Frame Size: yF176. Typical Transformer Size: 3 ph - 167 kVA (2676). Primary Bus Bar Holes (Qty/Size): (4) .563 dia.. Secondary Bus Bar Holes (Qty/Size): (4) .563 dia..