GR 1089–Core
Wiring
Wiring
Simulator
Simulator
20
20
20
Tip
Tip
Equipment
Equipment
Ring
Ring
Variable
60 Hz ac
Voltage
Wiring
Simulator
Chassis
Ground
Variable
60 Hz ac
Voltage
Chassis
Ground
Source 0-600 V
Source 0-600 V
AC Equipment Ground
(Green Wire Ground)
(A) Metallic
AC Equipment Ground
(Green Wire Ground)
(B) Longitudinal
Figure 4.2 Second Level AC Power Fault and Current Limiter Connection
Current Limiting Protector Test
The purpose of the Current Limiting Protector Test, presented in Table 4.9, is to determine if
the EUT allows an excessive amount of current flow under power fault conditions. During
this test, the EUT is connected to a circuit equivalent to that shown in Figure 4.2 with a
1.6 A Type MDQ fuse from Bussman used as the wiring simulator. If the EUT draws enough
current to open the fuse, then the acceptable time/current criteria have not been met, and
external current limiting protectors must be specified for use with that equipment in the
manufacturer’s documentation.
Table 4.9 Current Limiting Protector Test
Applied Voltage, 60 Hz
Source Impedance
Test Connections
Test
1
(VRMS
)
ꢁ
Duration
15 min
(Table 4.1, Figure 4.2
600
2
A
Short-circuit Test
In addition to the AC Power Fault and Current Limiter Tests, equipment must also pass a
Short-circuit Test to comply with GR 1089. During this test, a short-circuit condition is
applied to the following Tip and Ring appearances for 30 minutes while the EUT is powered
and under operating conditions:
•
•
•
Tip-to-Ring, Tip-to-Ground with Ring open circuit
Ring-to-Ground with Tip open circuit
Tip- and Ring-to-Ground simultaneously for 30 minutes
At no time will the short circuit exceed 1 ꢂ. For equipment with more than one twisted pair,
the short circuit is applied to all twisted pair simultaneously. To comply with the short circuit
test, the EUT must function normally after the short-circuit condition is removed, and a fire
hazard may not be present. The equipment shall not require manual intervention to restore
service.
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SIDACtor Data Book and Design Guide
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