Page 63 - puget sound energy community energy programs

Chapter 5

Figure 33 Single-phase CT mounting base

EUSERC 328A SHOWN
CT MOUNTING BOLTS
3/4" 5" TYPICAL 4 PLACES -
SEE NOTE 3
1-3/4"
1-3/8"

1-1/2" 1-1/2" 7/8"
N

10-32 MACHINE SCREW 8-1/8"
& WASHER DRILLED AND
TAPPED INTO BUS

1-3/8"
1-3/4"

3/4" 8" MIN BUS MARKING “CT”
CABLE TERM. BOLTS (TYPICAL 2 PLACES)
(TYPICAL 4 PLACES - SEE NOTE 3)

INSULATING SUPPORT (SEE NOTE 1)
2" MIN 1/4"
2-1/2" MAX

3-1/2"
INSULATING
BARRIER

Notes:
1. Insulated supports shall be rated for the serving voltage and have sufficient
mechanical strength for the application.
2. Mounting base accepts bar-type current transformers only.
3. Two 1/2-inch steel bolts shall be provided for each cable terminating position and
each bolt shall be furnished with a spring washer and a nut. The spring washer
may be either a cone-type (belleville) or a split-ring washer and a flat washer. Bolts
shall be secured in place and spaced as shown. All parts shall be plated to prevent
corrosion.

Electric Service Handbook 2017 — Single-Family Residential Projects 54