![background image](http://html1.mh-extra.com/html/eaton/cutler-hammer-digitrip-1150/cutler-hammer-digitrip-1150_instructions-manual_3891154036.webp)
Effective 10/2004
Page 36
I.L. 70C1036H05
5.3.2 Standard Requirements
As a follow-up to the basic performance requirements
stipulated by the NEC, UL Standard No. 1053 requires that
certain minimum instructions must accompany each
ground fault protection system. These statements (Section
5.4.3), plus a copy of the record forms (Figures 8.1, 8.2,
and 8.3), are included as part of this Instructional Leaflet.
5.3.3 General Test Instructions
The interconnected system must be evaluated only by
qualified personnel and in accordance with the equipment
assembler’s detailed instructions.
To avoid improper operations following apparently correct
simulated test operations, the polarity of the neutral sensor
connections (if used) must agree with the equipment
assembler’s detailed instructions. Where a question
exists, consult the specifying engineer and/or equipment
assembler.
To avoid improper operations following apparently correct
simulated test operations, the polarity of the neutral sensor
connections (if used) must agree with the equipment
assembler’s detailed instructions. Where a question
exists, consult the specifying engineer and/or equipment
assembler.
WARNING
PERSONAL INJURY CAN OCCUR WHEN WORKING ON
POWER SYSTEMS. ALWAYS TURN OFF POWER
SUPPLYING CIRCUIT BREAKER BEFORE CONDUCT-
ING TESTS. TEST OUT OF THE CELL, IF POSSIBLE.
THERE IS A HAZARD OF ELECTRICAL SHOCK OR
BURN WHENEVER WORKING IN OR AROUND ELEC-
TRICAL EQUIPMENT.
Verify the grounding points of the system using high-
voltage testers and resistance bridges to ensure that
ground paths do not exist that could bypass the sensors.
Use a low-voltage (0 to 24 volt), high-current, AC source to
apply a test current of 125 percent of the Digitrip unit
ground pick-up setting through one phase of the circuit
breaker. This should cause the circuit breaker to trip in
less than 1 second and operate the alarm indicator. Reset
the Digitrip and then reclose the circuit breaker. Repeat the
test on the other two phases
(See Figure 5.2).
Apply the same current as described above through one
phase of the circuit breaker, returning through the neutral
sensor. The circuit breaker should not trip, and the alarm
indicator should not operate. Repeat the test on the other
two phases.
Figure 5.2 Connection Details for Conducting Single
Pole,Single Phase Current Tests with the
Circuit Breaker Removed from the Cell
Apply the same current as described above through any
two phases of the circuit breaker. The circuit breaker
should not trip. Repeat the test using the other two
combinations of circuit breaker phases
(See Figure 5.3).
Figure 5.3 Connection Details for Conducting Single
Phase Current Tests with the Circuit Breaker Removed
from the Cell
An alternative test setup is shown in Fig. 5.4. This three
pole hookup should be employed when a low Ground
Pickup setting is to be tested like 0.24x and 0.3x and
without Aux power present. The Test Circuit does provide a
net residual ground current excitation of “1”. Two of the
phases cancel each other out as far as ground fault but
now the Digitrip is provided with three pole power up
current simulating three phase power.
Suitable
Conductors
Primary
Disconnect
Stabs
When Drawout
A
B
C
Polarity &
Identification
Low-Voltage
AC Current
Source
Suitable
Conductors
Primary
Disconnect
Stabs-
When Drawout
A
B
C
Polarity &
Identification
Shorting
Conductors
Low-Voltage
AC Current
Source