WORKING ALLOWABLE LOAD CAPACITY TABLE
REFERENCE: NEMA FG-1 (current issue) The working (allowable) load capacity represents the ability of a fiberglass cable tray to support the static weight of cables. It is equivalent to the destruction load capacity, as determined by testing in accordance with paragraph 4.1, with a minimum safety factor of 1.5.
|
Support Span Ft. (m) |
ELL3 Class A |
ELL4 Class A |
ELL6** EMZ6 Class A |
EIL6 Class B |
D-EHL6* EHL6 Class C |
D-EHL8* EHL8 Class C |
D-EHL10* Class C |
|
30 (9.1) |
-
|
-
|
-
|
-
|
-
|
-
|
100 (148) |
|
20 (6.0) |
-
|
-
|
50
(74)
|
75
(111)
|
100
(148)
|
100
(148)
|
100
(148)
|
|
18 (5.5) |
-
|
-
|
61
(90)
|
92 (137)
|
123
(183)
|
123
(183)
|
225
(335)
|
|
16 (4.8) |
-
|
-
|
78
(116)
|
117 (174)
|
156
(232)
|
156
(232)
|
277
(412)
|
|
14 (4.3) |
-
|
-
|
100
(49)
|
150
(232)
|
200
(298)
|
-
|
-
|
|
12 (3.6) |
-
|
50
(74)
|
139
(207)
|
208
(310)
|
-
|
-
|
-
|
|
10 (3) |
-
|
72 (107)
|
200
(298)
|
-
|
-
|
-
|
-
|
|
8 (2.4) |
50 (74) |
112
(167)
|
-
|
-
|
-
|
-
|
-
|
| Note:
Values shown are also applicable to vinyl ester resin where available.
* Designates a minimum safety factor of 2.0. ** Designates a minimum safety factor of 3.0. |
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Concentrated
static load (if required by User)
A concentrated
static load is not
included in Table 1.
Some user applications may require that a given concentrated static load
be imposed over and above the working load.
Such concentrated static load represents a static weight applied between
the side rails at midspan. When so specified, the concentrated static
load may be converted to an equivalent load (We)
in pounds per linear foot (kg/m) using the formula:
|
We
=
|
2
x (Concentrated Static Load)
|
|
span
length (feet or m)
|
and added to the static
weight of cable in the tray.
This combined load may be used to select a suitable load/span designation.
(Table 1) If the combined load exceeds the working load shown, the manufacturer
should be consulted.
|
Vinyl
Ester Resin weights are the same as Polyester.
|
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|
General
Number WR
|
ELL3-
W-R-L Lbs./Ft.
|
ELL4-
W-R-L Lbs./Ft.
|
ELL6-
W-R-L Lbs./Ft.
|
EIL6
EHL6-W-R-L Lbs./Ft.
|
D-EHL6-
W-R-L Lbs./Ft.
|
D-EHL8-
W-R-L Lbs./Ft.
|
D-EHL10-
W-R-L Lbs./Ft.
|
| SS-06-06 |
2.0
|
2.5
|
3.3
|
3.8
|
4.5
|
5.5
|
9.2
|
|
SS-06-09
|
1.8
|
2.3
|
3.0
|
3.6
|
4.3
|
5.3
|
9.0
|
|
SS-06-12
|
1.7
|
2.2
|
2.9
|
3.5
|
4.2
|
5.3
|
8.9
|
|
SS-06-18
|
1.6
|
2.1
|
2.8
|
3.4
|
4.1
|
5.2
|
8.9
|
|
SS-09-06
|
2.3
|
2.8
|
3.5
|
4.1
|
4.7
|
5.8
|
9.5
|
|
SS-09-09
|
1.9
|
2.5
|
3.2
|
3.8
|
4.4
|
5.5
|
9.2
|
|
SS-09-12
|
1.8
|
2.3
|
3.1
|
3.6
|
4.3
|
5.4
|
9.1
|
|
SS-09-18
|
1.7
|
2.2
|
2.9
|
3.5
|
4.2
|
5.3
|
8.9
|
|
SS-12-06
|
2.5
|
3.0
|
3.8
|
4.3
|
4.9
|
6.0
|
9.7
|
|
SS-12-09
|
2.1
|
2.6
|
3.4
|
3.9
|
4.6
|
5.7
|
9.3
|
|
SS-12-12
|
1.9
|
2.5
|
3.2
|
3.8
|
4.4
|
5.5
|
9.2
|
|
SS-12-18
|
1.8
|
2.3
|
3.0
|
3.6
|
4.2
|
5.4
|
9.0
|
|
SS-18-06
|
3.0
|
3.5
|
4.2
|
4.8
|
5.3
|
6.5
|
10.1
|
|
SS-18-09
|
2.4
|
2.9
|
3.7
|
4.3
|
4.8
|
6.0
|
9.6
|
|
SS-18-12
|
2.2
|
2.7
|
3.4
|
4.0
|
4.6
|
5.8
|
9.4
|
|
SS-18-18
|
1.9
|
2.5
|
3.2
|
3.8
|
4.4
|
5.5
|
9.2
|
|
SS-24-06
|
3.5
|
4.0
|
4.7
|
5.3
|
5.7
|
7.0
|
10.5
|
| SS-24-09 |
2.7
|
3.3
|
4.0
|
4.6
|
5.1
|
6.3
|
9.9
|
| SS-24-12 |
2.4
|
2.9
|
3.7
|
4.3
|
4.8
|
6.0
|
9.6
|
| SS-24-18 |
2.1
|
2.6
|
3.4
|
3.9
|
4.5
|
5.7
|
9.3
|
| SS-30-06 |
4.0
|
4.5
|
5.2
|
5.8
|
6.2
|
7.5
|
10.9
|
| SS-30-09 |
3.1
|
3.6
|
4.3
|
4.9
|
5.4
|
6.6
|
10.1
|
| SS-30-12 |
2.7
|
3.2
|
3.9
|
4.5
|
5.0
|
6.3
|
9.8
|
| SS-30-18 |
2.3
|
2.8
|
3.5
|
4.1
|
4.9
|
5.9
|
9.5
|
| SS-36-06 |
4.5
|
5.0
|
5.7
|
6.3
|
6.6
|
8.0
|
11.4
|
| SS-36-09 |
3.4
|
3.9
|
4.6
|
5.2
|
5.6
|
7.0
|
10.4
|
| SS-36-12 |
2.9
|
3.4
|
4.2
|
4.8
|
5.2
|
6.5
|
10.0
|
|
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EFFECT
OF TEMPERATURE - FRP
Strength properties of reinforced plastics are reduced when continuously
exposed to elevated temperatures. Working loads shall be reduced when
based on the following:
|
EFFECT
OF TEMPERATURE - FRP (Table 3)
|
||
|
Temperatures
in Degrees °F |
Polyester
Resin
% of Strength |
Vinyl
Ester Resin
% of Strength |
|
75
|
100
|
100
|
|
100
|
90
|
100
|
|
125
|
78
|
100
|
|
150
|
68
|
90
|
|
175
|
60
|
90
|
|
200
|
52
|
75
|
|
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|
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|
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Note: Percentages shown are approximate. If unusual temperature conditions exist, the manufacturer should be consulted. Below freezing temperatures do not adversely affect the load rating capability of the tray. Fiberglass does not become brittle at below freezing temperatures. Careful review should be made of applications involving service temperatures over 200° F.
The test values in the following chart were obtained from tests conducted by Enduro's vinyl ester resin supplier. The values shown, although obtained from an actual coupon test, are intended for illustrative purposes only, and not for use in design calculations. The values for polyester are slightly lower.
|
EFFECT
OF TEMPERATURE - FRP (Table 4)
|
|||
|
Test
Temp.
°F |
Flex.
St., PSI,
ASTM D790 |
Flex.
Mod., PSI x 10°,
ASTM D790 |
Tensile
St., PSI,
ASTM D638 |
|
-100
|
101,500
|
3.36
|
84,100
|
|
-50
|
86,400
|
3.32
|
70,400
|
|
0
|
79,500
|
3.42
|
63,900
|
|
50
|
72,300
|
3.38
|
58,000
|
|
77
|
68,100
|
3.24
|
56,100
|
|
100
|
66,300
|
3.29
|
54,600
|
|
150
|
58,700
|
3.07
|
49,900
|
|
200
|
27,400
|
1.98
|
41,800
|
|
250
|
13.200
|
0.98
|
29,600
|
|
300
|
9,200
|
0.83
|
22,000
|
|
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THERMAL CONTRACTION & EXPANSION
Table 5 compares the thermal contraction and expansion based on various temperature differentials for fiberglass, steel and aluminum cable trays. The values shown represent the length of cable tray that will produce a 5/8" movement between expansion connectors for the indicated temperature differential. Fiberglass has the least movement. Note: Enduro expansion connectors provide for total movement of 5/8".
| Comparison Chart for Thermal Contraction & Expansion (Table 5) | |||||||
|
Temp.
Differential
|
Fiberglass
|
Steel
|
Aluminum
|
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|
°F
|
°C
|
Ft.
|
(m)
|
Ft.
|
(m)
|
Ft.
|
(m)
|
|
25
|
(14)
|
417
|
(126)
|
320
|
(97)
|
162
|
(49)
|
|
50
|
(28)
|
208
|
(63)
|
160
|
(48)
|
81
|
(25)
|
|
75
|
(42)
|
138
|
(42)
|
106
|
(32)
|
54
|
(16)
|
|
100
|
(56)
|
104
|
(32)
|
80
|
(24)
|
40
|
(12)
|
|
125
|
(69)
|
83
|
(25)
|
63
|
(19)
|
32
|
(10)
|
|
150
|
(83)
|
69
|
(21)
|
53
|
(16)
|
26
|
(8)
|
|
175
|
(97)
|
59
|
(17)
|
45
|
(13)
|
23
|
(6)
|
|
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CORROSION RESISTANCE OF RESIN SYSTEMS
Two standard composite resin systems are available. For most applications, isophthalic polyester fire-retardant (FR-P) is the more widely used. A vinyl ester composite fire-retardant resin system (FR-VE) is recommended where strong acids (such as hydrochloric acid), strong alkalies (such as caustic soda), organic solvents and halogenated organic conditions exist. An abbreviated Guide is provided below to assist in the selection of the proper resin system for individual application.
All composite material has an ultra-violet light inhibiting chemical additive and has a maximum flame spread of 25 or less, per ASTM E-84 (Class 1 flame spread). All pultruded products have complete Nexus Veil Coverage (outer surfacing fabric) to provide maximum chemical and UV protection.
| CORROSION RESISTANCE OF RESIN SYSTEMS (Table 6) | ||
| Chemicals | 75°F | 160°F |
| Acetic Acid 5% | FR-P | FR-P |
| Acetic Acid 25% | FR-P | FR-VE-210° (*) |
| Aluminum Potassium Sulfate 5% | FR-P | FR-P |
| Ammonium Hydroxide 10% | FR-P | FR-VE-150° |
| Ammonium Nitrate | FR-P | FR-P |
| Benzenesulfonic Acid 5% | FR-P | FR-P |
| Calcium Chloride | FR-P | FR-P |
| Carbon Tetrachloride | FR-VE | FR-VE-100° (*) |
| Chlorine Dioxide 15% | FR-P | FR-VE-150° (*) |
| Chromic Acid 5% | FR-P | FR-VE-150° (*Call) |
| Copper Sulfate | FR-P | FR-P |
| Diesel Fuel No. 1 | FR-P | FR-P |
| Diesel Fuel No. 2 | FR-P | FR-P |
| Ethylene Glycol | FR-P | FR-P |
| Fatty Acids 100% | FR-P | FR-P |
| Ferrous Sulfate | FR-P | FR-P |
| Fluosilicic Acid | FR-VE | FR-VE (*Call) |
| Hydrochloric Acid 1% | FR-P | FR-P |
| Hydrochloric Acid 15% | FR-P | FR-VE-180° (*) |
| Hydrochloric Acid 37% | FR-P | FR-VE-150° (*) |
| Hydrogen Sulfide | FR-P-140° | FR-VE-210° (*) |
| Kerosene | FR-P | FR-P |
| Magnesium Chloride | FR-P | FR-P |
| Methyl Alcohol 10% | FR-P | FR-VE-150° (*) |
| Naphtha | FR-P | FR-P |
| Nitric Acid 5% | FR-P | FR-P |
| Nitric Acid 20% | FR-VE | FR-VE-120° (*) |
| Phosphoric Acid 10% | FR-P | FR-P |
| Phosphoric Acid 30% | FR-P | FR-P |
| Phosphoric Acid 85% | FR-P | FR-P |
| Sodium Bicarbonate 10% | FR-P | FR-P |
| Sodium Bisulfate | FR-P | FR-P |
| Sodium Carbonate | FR-P | FR-VE |
| Sodium Chloride | FR-P | FR-P |
| Sodium Hydroxide 1 - 50% | FR-VE | FR-VE-120° (*) |
| Sodium Hypochlorite 5% | FR-P | FR-VE-120° (*) |
| Sodium Nitrate | FR-P | FR-P |
| Sodium Silicate | FR-P | FR-VE-210° (*) |
| Sodium Sulfate | FR-P | FR-P |
| Sulfuric Acid 0 - 30% | FR-P | FR-P |
| Sulfuric Acid 30 - 50% | FR-VE | FR-VE |
| Sulfuric Acid 50 - 70% | FR-VE | FR-VE-180° (*) |
| Trisodium Phosphate 25% | FR-P | FR-VE-210° (*) |
| Trisodium Phosphate - All | FR-VE | FR-VE-210° (*) |
| Water, Distilled | FR-P | FR-P |
|
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INSTRUMENTATION
TRAY LOADING
EI(S) = Solid
EI(P) = Punched
The loads on Table 7 are based on limiting the deflection to a value equal
to 1/120th of the span. Reduce loads by 10% for punched tray.
| INSTRUMENTATION TRAY LOADING (Table 7) | ||||||
| Part Number | Span | Max Loading | Max Deflection | |||
| Ft. | (m) | Lbs./Ft. | (m) | In. | (mm) | |
| EI( )-200 | 5 | (1.5) | 4.0 | (5.94) | .5 | (12.7) |
| EI( )-300 | 5 | (1.5) | 3.9 | (5.79) | .5 | (12.7) |
| EI( )-300 | 8 | (2.4) | 1.0 | (1.48) | .8 | (20.3) |
| EI( )-400 | 8 | (2.4) | 2.8 | (4.16) | .8 | (20.3) |
| EI( )-400 | 10 | (3.0) | 1.5 | (2.23) | 1.0 | (25.4) |
| EI( )-600 | 10 | (3.0) | 2.8 | (4.16) | 1.0 | (25.4) |
| EI( )-800 | 10 | (3.0) | 5.2 | (7.73) | 1.0 | (25.4) |
| EI( )-1000 | 10 | (3.0) | 20.0 | (29.73) | 1.0 | (25.4) |
| EI( )-1000 | 15 | (4.5) | 3.9 | (5.79) | 1.0 | (25.4) |
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