Rectangular * Square * Round
BBI–3A 3.28 – 5.57 in.
(83 – 141 mm) 1 1/2 x 1/4 — 2 1/2 x 1/2 in.
(38 6 — 64 13 mm) 1 1 – 1 1/2 1 1/2 in.
(25 25 – 38 38 mm) 1 1/8 — 1 3/4 in.
(29 — 44 mm)
BBI–4A 5.43 – 8.86 in.
(138 – 225 mm) 2 1/2 3/8 — 4 3/4 in.
(64 10 — 102 19 mm) 2 2 in.
(51 51 mm) 1 3/4 — 2 3/4 in.
(44 — 70 mm)
BBI–5A 6.67 – 10.86 in.
(169 – 276 mm) 3 x 5/8 — 5 x 3/4 in.
(76 16 — 127 19 mm) 2 2 – 2 1/2 2 1/2 in.
(51 51 – 64 64 mm) 2 1/8 — 3 3/8 in.
(54 — 86 mm)
BBI–6A 7.57 – 12.86 in.
(192 – 327 mm) 3 1/2 1/2 — 6 3/4 in.
(89 13 — 152 19 mm) 2 1/2 2 1/2 – 3 3 in.
(64 64 – 76 76 mm) 2 1/2 — 4 in.
(64 — 102 mm)
BBI–7A 8.28 – 13.00 in.
(210 – 330 mm) 4 x 1/4 — 6 x 3/4 in.
(102 6 — 152 19 mm) 2 1/2 2 1/2 – 3 3 in.
(64 64 – 76 76 mm) 2 3/4 — 4 1/8 in.
(70 – 105 mm)
BBI–8A 10.29 – 16.43 in.
(261 – 417 mm) 5 1/4 — 8 3/8 in.
(127 6 — 203 10 mm) 3 3 – 4 4 in.
(76 76 – 102 102 mm) 3 3/8 — 5 1/8 in.
(86 — 130 mm)
BBI–9A 12.29 – 19.23 in.
(312 – 488 mm) 6 x 1/4 — 9 x 3/4 in.
(152 6 — 229 19 mm) 3 1/2 3 1/2 – 5 5 in.
(89 89 – 127 127 mm) 4 — 6 1/8 in.
(102 — 156 mm)
BBI–10A 15.43 – 24.14 in.
(392 – 613 mm) 8 1/4 — 10 3/4 in.
(203 6 — 254 19 mm) 5 5 – 6 6 in.
(127 127 – 152 152 mm) 5 — 7 5/8 in.
(127 — 194 mm)
25 kV Bus Bar Size Ranges
BBI–3A 3.28 – 3.56 in.
(83 – 90 mm) 1 1/2 x 1/4 — 1 1/2 x 3/8 in.
(38 6 — 38 10 mm) MEASURE
CIRCUMFERENCE 1 1/8 in.
(29 mm)
BBI–4A 5.43 – 5.80 in.
(138 – 147 mm) 2 1/2 3/8 — 2 1/2 5/8 in.
(64 10 — 64 16 mm) MEASURE
CIRCUMFERENCE 1 3/4 in.
(44 mm)
BBI–5A 6.67 – 7.18 in.
(169 – 182 mm) 3 x 5/8 — 3 x 3/4 in.
(76 16 — 76 19 mm) MEASURE
CIRCUMFERENCE 2 1/8 – 2 1/4 in.
(54 — 57 mm)
BBI–6A 7.57 – 8.43 in.
(192 – 214 mm) 3 1/2 1/2 — 4 1/4 in.
(89 13 — 102 6 mm) MEASURE
CIRCUMFERENCE 2 1/2 – 2 5/8 in.
(64 — 67 mm)
BBI–7A 8.28 – 10.44 in.
(210 – 265 mm) 4 x 1/4 — 5 x 3/8 in.
(102 6 — 127 10 mm) 2 1/2 2 1/2 in.
(64 64 mm) 2 3/4 — 3 1/4 in.
(70 – 83 mm)
BBI–8A 10.29 – 12.88 in.
(261 – 327 mm) 5 1/4 — 6 3/4 in.
(127 6 — 152 19 mm) 3 3 in.
(76 76 mm) 3 3/8 — 4 in.
(86 — 102 mm)
BBI–9A 12.29 – 15.31 in.
(312 – 389 mm) 6 x 1/4 — 7 x 3/4 in.
(152 6 — 178 19 mm) 3 1/2 3 1/2 – 4 4 in.
(89 89 – 102 102 mm) 4 — 4 7/8 in.
(102 — 124 mm)
BBI–10A 15.43 – 19.79 in.
(392 – 503 mm) 8 1/4 — 9 3/4 in.
(203 6 — 229 19 mm) 5 5 in.
(127 127 mm) 5 — 6 1/4 in.
(127 — 159 mm)
NOTE:* Rectangular and square bar sizes are based on bars having radiused edges and corners.
NOTE: BBI–A sizing is based on straight sections of bar. For bolted connections consult bolted connection chart on page 3.
NOTE: Contact your 3M Sales Rep for recommendation on the use of BBI–A on 1/8” thick bus bar.