EV3.4.8 Accumulator containers must be attached to the major structure of the chassis by 8 mm Metric Grade
8.8 (5/16 inch Grade 5) fasteners, or stronger.
a. Accumulators less than 20 kg must use a minimum of 4 fasteners.
b. Accumulators more than 20 kg and less than 30 kg must use a minimum of 6 fasteners.
c. Accumulators more than 30 kg and less than 40 kg must use a minimum of 8 fasteners.
d. Accumulators more than 40 kg and greater must use a minimum of 10 fasteners
EV3.4.9 Accumulator container mounting brackets to the Primary Structure must be made of steel 1.6mm
(0.063 inch) thick or aluminum 4mm (0.157 inch) thick. Brackets must have gussets to carry bending
loads. Accumulator container mounting brackets and/or mounts for composite monocoque chassis or
accumulator containers must satisfy the following:
a. Accumulator attachments including laminate, mounting plates, backing plates and inserts must
be capable of carrying a load in any direction of 20kN.
b. Data obtained from the laminate perimeter shear strength test and 3 point bending test (T3.31)
should be used to prove adequate strength is provided
c. Each attachment point requires steel backing plates with a minimum thickness of 2 mm.
Alternate materials may be used for backing plates if equivalency is approved.
d. The calculations/tests must be included in the SES or SRCF