Lineworker Reference

Calculates 100%, 200%, and 250% load amps per phase.

Range A (±5%) enforced at meter. Range B for extreme conditions.

All Single Phase Fuse Rating @ 150% Min.

@ 200% Min (<225 kVA)
@ 100% Min (≥225 kVA)

At mid-span (lowest sag). NESC 232/234.

NESC 235 – Vertical at pole. Primary above secondary.

All OH transformers to be installed with fiberglass cutout standoff bracket, squirrel guard on transformer, and cutout animal guard.

Secondary Wire: 1/0 triplex crib wire • #2 Triplex secondary services • 1/0 secondary CU tap wire • #6 stranded CU from neutral bushing/tank ground to down ground.

Crib Splitting: When 9 or more customers on a crib, the preferred method is to split into two separate transformers.

KVA Size Guideline by Number of Customers (guideline only — does not account for full load; grey/red areas may overlap).