Protectowire 2000 FireSystem Manual de usuario descargar pdf (Pagina 13)

chemicals, liquids, and environmental factors.

To assist the System Designer in selecting the

proper Protectowire model for the installa-

tion environment, a Chemical Resistance

Chart for the jacket materials used in all

Protectowire Linear Heat Detector models is

shown on page 26 of this manual. This chart

lists the effects of many common chemicals,

and is useful in determining the suitability of

installing Protectowire in various types of

aggressive environments.

Because it is not always possible to accurately

predict what effect extremely aggressive envi-

ronmental factors may have on a Detector’s

useful service life, we recommend that when

possible, actual field installation tests be per-

formed on product samples to determine

whether or not the model selected may be suit-

able for use in the proposed environment.

In outdoor applications, the effects of solar

radiation must also be considered during the

design of the system. Exposure to direct sun-

light or so called “black body” radiation may

cause the temperature of the detector or its

mounting surface to exceed the maximum

ambient limit or the alarm actuation tempera-

ture of the sensor.

It is important, therefore, to take precaution-

ary steps, such as installing a protective shield

over the sensing cable to reduce the installed

location temperature to acceptable limits.

Shielding also reduces the long term degrada-

tion of the outer jacket from influences such

as ultraviolet radiation. Protectowire models

XCR and EPR have special inhibitors in the

jacket material to help reduce the effects of

UV radiation and extend the detector’s useful

service life.

For outdoor applications, the recommended

method of splicing and terminating the

Protectowire, requires that all connections be

made within appropriately rated junction

boxes. All other applications, particularly

where high humidity or dampness may be

present, require the use of SFTS Sealant Tape

for all in-line splices using PWSC or PWS splic-

ing devices. Refer to Figures 7A and 7B for

the correct PWS and PWSC splicing proce-

dures.

Directions For Use of PWS Splicing Sleeves

1. Remove insulation from each wire to half the length of

leeve, preserving conductor insulation 3/8” (.9cm) from

bare wire back to braid:

2. Put sleeve on one pair of wires and with chain nose pliers

make an “S” bend in sleeves and wires to secure them to

each other:

3. Insert other pair of wires in sleeves and make a similar “S”

bend. The result should look like this:

7. Finished splice.

6. Roll insulating pad around the conductors and tape over

all to hold insulating pad in place and exclude moisture.

The use of SFTS sealant tape is recommended prior to

applying the final electrical tape wrap.

5. Cut this pad just long enough to reach from jacket to jack-

et of the two cable ends and insert it between conductors:

4. Double a strip of “Scotch” electrical tape No. 33+ or No.

35 (the adhesive on the other tape may in time soften the

heat-sensitive insulation and cause false alarms) to make a

non-adhesive insulating pad.

Figure 7A

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 32 33

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