Page 48 - Puret Sound Energy Hand Book 1218

Chapter 4

Figure 22 Typical joint utility trench with primary voltage cable on your private property
(cross-section view)

PRIMARY POWER CABLE PRIMARY POWER CABLE
DIRECT BURIED OR DB120 CONDUIT INSTALLATION SCHEDULE 40 CONDUIT INSTALLATION
18"
18"
ROADSIDE TYPICAL 24" MIN ROADSIDE TYPICAL 24" MIN
FINAL GRADE TO EXCAVATED DIRT PILE FINAL GRADE TO EXCAVATED DIRT PILE
BACKFILL FOR DB120
36" CONDUIT/DIRECT BURIED
MIN 12" MIN CABLE (NO ROCKS OVER 36"
COVER SEPARATION 10" DIAMETER) MIN BACKFILL FOR
COVER 12" MIN SCHEDULE 40 CONDUIT
48" 48" SEPARATION (NO ROCKS OVER 10"
DIAMETER)
MAX 6" OR 12" OF SAND, 5/8" MINUS, MAX
OR CLEAN BACKFILL SHADING 1
3" OF SAND, 5/8" MINUS, OR CLEAN BACKFILL BEDDING

PHONE & TV PRIMARY POWER CABLE DIRECTLY PHONE & TV PRIMARY POWER CABLE
IN CUSTOMER-PROVIDED
BURIED OR IN PSE-PROVIDED GRAY DISCONTINUOUS GRAY
DB120 GRADE CONDUIT SCHEDULE 40 CONDUIT

PRIMARY POWER, MAINLINE GAS, AND COMMUNICATIONS

32"
ROADSIDE TYPICAL 24" MIN
FINAL GRADE POWER, GAS, AND COMMUNICATIONS EXCAVATED
DIRT PILE
12" MIN BACKFILL (NO ROCKS OVER 10" DIAMETER)
36" MIN SEPARATION
48" COVER 12" MIN 12" MIN
MAX SEPARATION SEPARATION 6" OR 12" MIN SAND SHADING AFTER COMPACTION 2

4" SAND BEDDING
1 SEE TRENCH AND BACKFILL REQUIREMENTS FOR
PRIMARY ELECTRIC LINE EXTENSION TRENCHES
(NO PSE GAS) ON PAGE 40.
GAS PRIMARY POWER 2
COMMUNICATIONS CABLES OR CONDUIT SEE TRENCH AND BACKFILL REQUIREMENTS FOR
PRIMARY ELECTRIC LINE EXTENSION TRENCHES
(WITH PSE GAS) ON PAGE 41.

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Electric Service Handbook 2017 — Single-Family Residential Projects 39