P4802ACMC datasheet(146/212 Pages) TECCOR

146 / 212 page

UL 60950 3rd Edition (formerly UL 1950, 3rd edition)

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SIDACtor® Data Book and Design Guide

Figure 4.7 Longitudinal Connection Appearances

Overvoltage Test Procedures

Use the following criteria when applying the overvoltage tests presented in Table 4.17:

1. Test Set-up — Equipment is to be mounted as it is intended to be used. Tests may be

conducted on either the equipment as an assembly, individual subassemblies, or a

partial assembly containing those components which may be exposed to an overvoltage

condition.

2. Indicators — Before testing, two single pieces of cheesecloth are to be wrapped tightly

around the assembly, subassembly, or partial assembly. The cheesecloth acts as an

indicator for conditions that may result in fire.

3. Line Cords — Equipment with a removable telecommunications line cord is to be

connected to the test circuit with a line cord having 0.4 mm (26 AWG) or larger copper

wire conductors and not more than 1

W total resistance.

4. Functional Circuitry — UL mandates that functional circuitry must be used for each

overvoltage test conducted. This allows repair or replacement of damaged circuitry

before subsequent testing. Alternatively, separate samples may be used for each test.

5. Wiring Simulators — A wiring simulator is used to indicate whether the maximum I2t

imposed upon telecommunications wiring has been exceeded. For Tests 1 and 5, a

wiring simulator is to be used unless the equipment is specified for use with a suitable

secondary protector or a secondary protector simulator. The wiring simulator can consist

of one of the following:

a. 50mm length of 0.2 mm (32 AWG) bare or enameled solid copper wire (for test

condition 1)

b. Bussman Mfg. Co. Type MDL-2A fuse (for test condition 1)

c. 300 mm length of 0.4 mm (26 AWG) solid copper wire which connects to a

representative installation (includes wiring an connectors)

[This option is used when the manufacturer specifies the complete installation from

the network interface to the equipment.]

d. Current probe used with a 300 mm length of 0.5 mm (24 AWG) copper wire (for test

condition 1)

Equipment

Under Test

Secondary Protector

Simulators or

Wiring Stations

Timed

Switch

Equipment

Earth

Current

Limiting

Resistors

Variable

AC Voltage

Source

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