P4802ACMC datasheet(133/212 Pages) TECCOR

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GR 1089–Core

4 - 9

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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.

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

W. 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.

Equipment

Tip

Wiring

Simulator

Ring

Chassis

Ground

Variable

60 Hz ac

Voltage

Source 0-600 V

(A) Metallic

AC Equipment Ground

(Green Wire Ground)

Equipment

Tip

Ring

Chassis

Ground

Wiring

Simulator

Variable

60 Hz ac

Voltage

Source 0-600 V

(B) Longitudinal

AC Equipment Ground

(Green Wire Ground)

Wiring

Simulator

Table 4.9 Current Limiting Protector Test

Test

Applied Voltage, 60 Hz

(VRMS)

Source Impedance

Duration

Test Connections

(Table 4.1, Figure 4.2

600

15 min

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