GAI-Tronics Clean Phone 295W Manuel - Sayfa 6

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Model 295F and 295W Clean Phone™ Telephone

Power and Wiring Information (Level C Power)

The Model 295F and 295W Clean Phones are powered from a 48 V dc @ 250 mA power supply. The

power supply should be Nationally-Recognized Testing Laboratory (NRTL) listed per UL specification

UL 1012 or equivalent.

If these clean telephones are powered through the black and yellow "spare pair" in the telephone cable,

the power to these wires must be limited to UL Level C power. To meet the requirements for Level C

power, the current to the telephone must be limited to 1 ampere maximum at 48 V dc.

The GAI-Tronics Model 237 Power Supply is a 48 V dc @ 250 mA UL listed power supply that can be

used to power a single Model 295 Clean Phone. See Figure 4 for wiring details for the Model 237 Power

Supply.

The distance between a telephone and the 48 V dc power source is limited only by the maximum

allowable wire resistance, (32 ohms). See the table for calculated distances for standard wire sizes.

AWG

Refer to the table provided above. When using 24 AWG wire, the 48 V dc power source can be located

up to 620 feet, 190 meters, or 0.11 miles away from the phone. Paralleling pairs of the same gauge wire

will increase operating distance by a factor of two.

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Calculated Distance for Standard Wire Sizes

Feet

620

985

1585

1985

2500

3980

6350

Figure 4. Model 237 Power Supply Wiring

Meters

Miles

190

0.11

300

0.18

480

0.30

605

0.37

760

0.47

1210

0.75

1935

1.2

Pub. 42004-146H

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