12-20 BE1-951 Installation 9328900990 Rev L
Terminal Blocks
There are two sizes of terminal blocks used on the H1 case design, the current circuit block and the input-
output blocks. The current circuit terminal block is the larger of the two types and uses 8/32 inch Phillips
head screws with lock washers. The input-output block is the smaller of the two types and uses 6/32 inch
slot or Phillips head screws with no washer. The S1 case design uses slotted 10-32 washerless "pan-
head" screws for current and potential inputs. The input-output blocks are the same size as those
incorporated in the H1 design, and use 6/32-inch slot or Phillips head screws.
As stated, the current circuit terminal block on the H1 case uses 8/32 inch Phillips head screws with lock
washers. The lock washer is an integral part of the current circuit wiring system and should not be
removed. Without the lock washer, the 8/32-inch screw may bottom out, preventing a tight fit against the
lug (screw feels tight but lug may move under the screw head).
The maximum wire lug width accommodated by the current circuit terminal block on the H1 case is .344
inches (8.6 mm). The maximum wire lug width accommodated by the input-output block on the H1 and S1
case is 0.320 inches (8.1 mm). Current and potential inputs on the S1 case are not limited by the barrier
board terminal block design.
CT Polarity
CT polarity is critical to the proper operation of the BE1-951. Sidebar 12-1 provides fundamental
information on CT polarity and protective relays.
NOTE
Except as noted, connections to the relay should be made with a minimum wire
size of #14 AWG.
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