Protectowire 2000 FireSystem Manuel d'utilisateur télécharger pdf (Page 12)

adjacent branch line and proceeds in the opposite

direction. The detector run continues in this

manner until the end of the detection zone is

reached, or until the maximum Protectowire con-

trol panel zone allocation is reached, typically

5,000 feet [1,524 m].

The completed Protectowire portion of the

circuit for each overhead zone will be in a ser-

pentine pattern as illustrated in Figure 6, with

the Protectowire terminated at each end in an

approved zone box, end-of-line zone box, or

other approved junction box provided as part

of the system. Strain relief connectors, Series

SR-502, shall be installed in all junction boxes

where Protectowire enters or exits the enclo-

sure, in order to hold the cable securely and

maintain dust and moisture tight conditions.

(See Figures 1, 1A, 1B).

Detector Zoning For Sprinkler Release

Detection system zone allocation should not

be confused with zone allocation for sprin-

kler systems. A water system, or sprinkler

zone controlled by one valve may have a dif-

ferent meaning than terminology used for

detection zones. Generally, a detection zone

refers to a defined area within a protected

premise. In the case of Protectowire, it also

refers to the maximum amount of linear heat

detection cable that a panel will operate on a

single detection circuit (zone). Protectowire

panels such as the FS2000, SRP-4x4, and 2600

HD Series are approved for 5,000 feet

(1,524 m) per zone.

On the other hand, a water zone, or system,

has an area of coverage based upon its

designed discharge density which may exceed

the area which can be covered effectively by a

single detection zone. When a detection zone’s

length limitation is exceeded, a second detec-

tion zone is required to complete the total area

of detector coverage needed to match the area

of coverage provided by the corresponding

water zone. In this scenario, the two detection

zones are connected at the control panel in an

“or” configuration so that the actuation of

either detection zone will operate the

solenoid of the corresponding water

system. Do not extend a detection circuit

from one area into an area serviced by

another water valve. Each water valve must

be controlled by one or more detection

zones physically located in the same area.

Rack systems - With the variety of rack sys-

tems in use today, a wide range of configu-

rations may be confronted when installing

linear heat detection systems for electrical

actuation of sprinkler valves. As a mini-

mum, the guidelines of Factory Mutual in

conjunction with the manufacturer’s rec-

ommendation must be followed. In general,

rack detection systems should be installed

based upon the following criteria:

For single row and double row racks, one

line of detection cable is needed at each in-

rack sprinkler level. Locate the linear heat

detector cable in the transverse or longitu-

dinal flue space and attach it to a horizon-

tal load beam at the sprinkler line level.

For multiple-row racks, a line of detection

cable is needed for each in-rack sprinkler

line at each in-rack sprinkler level. Locate

the linear heat detection cable in either the

transverse or longitudinal flue space and

attach it to a horizontal load beam at the

sprinkler branch line levels.

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Protectowire is available in a range of con-

structions and jacket materials, in order to

provide resistance to attack from various

Figure 6

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Protectowire 2000 FireSystem Manuel d'utilisateur Page 12

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