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Table A-4. Example - 10 Miles, 345 kV, 250 Strings of Insulators

Porcelain - | 4500 bells, 52-3, 13.5 Ibs. ea., total 60,760 Ibs. 750 crates at 3.1 cu. ft. = 2,325 cu. ft. Insulator cost = $51.760 ($11.60/bell) |
Polymers - | 250 units, 14.4 Ibs. ea., total 3 600 Ibs. 5 crates at 75 cu. ft. = 375 cu. ft. Insulator cost = $51.750 |

Savings

1.

Storage space at receiving point (3 mos.)
porcelain - 580 sq. ft.; polymer - 100 sq. ft. ........... 480 sq. ft.

$ 60.00

2.

Off-load, re-load at receiving point
porcelain - 10 man-hrs.; polymer - 2 man-hrs. ........ 8 man-hrs.

$120.00

3.

Breakage - off-loading, storage. re-load-
porcelain - 1 percent; polymer - 0 ............................. 1 percent

$517.50

4.

Truck - receiving point to tower sites (5 miles)
porcelain- 1.00/cwt.; polymer .50/cwt ........................ $589.50

$589.50

5.

Off load at tower site
porcelain - 5 man-hrs.; polymer - 1 man-hr. ............ 4 man-hrs.

$60.00

6.

Unpack at tower site
porcelain - 50 crates/hour, 25 man-hrs.
polymer - 50 insulators/hour, 5 man-hrs. ................ 20 man-hrs.

$300.00

7.

Breakage - off-loading through
string assembly & cleaning
porcelain - 1 percent: polymer - 0 ............................. 1 percent

$517.50

8.

Assemble strings, attach blocks
porcelain - 40 man-hrs.; polymer - 8 man-hrs. ....... 32 man-hrs.

$480.00

9.

Clean insulators
porcelain- 10 min./string; polymer - 3 min./string ... 29 man-hrs.

$435.00

10.

Lift string into place (2 men)
porcelain - 5 min./string; polymer - 2 min./string .. 25 man-hrs.

$375.00

11.

Install & connect to tower (2 men)
porcelain - 5 min./string polymer - 2 min./string ... 25 man-hrs.

$375.00

12.

Breakage - lifting & installation
porcelain - 0.5 percent; polymer - 0 ........................ 0.5 percent

$258.75

13.

Cleanup packaging materials at jobsite
porcelain - 6 man-hrs.; polymer - 1.5 man-hrs. ..... 4.5 man-hrs.

$67.50

(Courtesy Hubbell Power Systems)

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