Memorandum - NHTSA

VI- 10
close a circuit and send a signal to the relay switch. This type of technology is a good analog for
estimating the cost of the approximate 450-600 mm (1 8" X 24") threshold warning contact
surface, and the approximate 150-575 mm (6'' X 23") outer bamer, inner roll stop and bridgin:;
device contact surface areas. Similarly, for the anti-crush interlock, a ribbon switch (about 2,2 00
mm or 88" long) including mounting hardware would be added around 3-sides of the perimeted
periphery of the platform's bottom surface. The Tapeswitch ribbon switch has a 12 ounce
contact pressure requirement. A relay switch would have to be added to the lift control systelr to
process the various interlock signals. The cost of a threshold warning signal lamp (and red
lenses) or audible warning signal has also been incorporated into Table VI-2.
Certification Equipment Cost - NHTSA has specified many of the lift requirements in objectil e,
quantitative terms so that performance can be measured in the laboratory. The certification coat
analysis assumes that the lift manufacturers have a test laboratory with complementary compul.er,
software, and printer/plotter capability and that they own most of the necessary test tools. The
agency believes that most lift companies already use a fixture capable of a 2,400 Ibs. ultimate Iest
load. So, this would not be a new cost. The dynamic outer barrier test and inner barrier loadii ig
tests, using the WC test device, will require speed sensing equipment in order to establish WC
control settings. The lift ambient noise levels, warning sound levels and platform lighting tests,
for example, will require audiometer and light intensity measurement equipment. A set of deild
weights, with loading pallet, up to 2,400 Ibs. will be needed for Static Test I (600 lbs.), II (1,8110
lbs.) and I11 (2,400 Ibs.). In other areas, a hand-held force gauge or pneumatic/ hydraulic pistc'n
and load cell may be needed. In addition, string potentiometers (displacement transducers) m ty