13
EVD-1 • 5401043 • REV M • 9/07
Note:
D=Maximum Linear Distance
*Steel Safe Construction:
Body: Minimum 1/4" Steel
Door: Minimum 1/2" Steel
**Composite Safe Construction:
Body: Minimum 16 Gauge Steel over 3" Composite Material
Door: Minimum 1/4" Steel over 3" Composite Material
Max. Linear Distance
from Detector to Any
Point on Protected
Surfaces of Steel Safes*
Maximum Linear Distance
from Detector to Any Point
on Protected Surfaces of
Composit Safes*
Number of Detectors
Required for Complete
Coverage of Single
Door Safes
Number of Detectors
Required for
Complete Coverage
of Double Door Safes
D<=96"
D<=110"
1
2
96"<D<=192"
110"<D<=220"
2
2
192"<D<=288"
220"<D<=330"
3
3
288"<D<=384"
330"<D<=440"
4
4
384"<D<=480"
440"<D<=550"
5
5
Determining The Maximum Linear Distance on A Safe
A rule of thumb for estimating the maximum linear distance from the recommended detector location to any point on the protected surface is:
Example: h = 62" w = 55" d = 29"
1. Compute X1 = h + w
1. X1 = 62"+ 55" (X1 = 117")
2. Compute X2 = 2d + w
2. X2 = (2 x 29") + 55" (X2 = 113")
3. Find
X =
minimum ( X1, X2 )
3.
X
=
113"
4. Compute
J =
w + d 4. J
=
55" + 29" (J = 84")
5. Find
D = maximum ( X, J )
5. D = 113"
Where: h = Safe Height
w = Safe Width
d = Safe Depth
D = Maximum Linear Distance
This rule of thumb is valid for
most
available safe sizes. However, if any one dimension is very large or very small when compared to the other
two dimensions, the safe may not follow this rule. In those cases, contact Potter’s technical support for assistance. Table 5 lists some common
safe dimensions and their maximum linear distances when detectors are installed in recommended locations.
Table 5. Typical Safe Exterior Dimensions and Maximum Linear Distances
Height
(inches)
Width
(inches)
Depth
(inches)
Volume
(cu. ft.)
Maximum Linear
Distance (inches)
25.00
21.00
21.00
6.38
46.00
32.00
25.00
25.00
11.57
57.00
42.00
31.00
29.00
21.85
73.00
52.00
31.00
29.00
27.05
83.00
62.00
31.00
29.00
32.26
89.00
62.00
55.00
29.00
57.23
113.00
64.00
31.00
29.00
33.30
89.00
72.00
35.00
29.00
42.29
93.00
79.00
43.00
33.00
64.87
109.00
Table 4.
