The placement of two leads in the same hole would be a design violation 
in accordance with IPC-D-275.

I have encluded the applicable paragraphs for your reference.

Regards
__________________________________________________

David W. Bergman, Technical Director
IPC
2215 Sanders Road
Northbrook, IL  60062-6135
847-509-9700 x340 Phone
847-509-9798 Fax
email  [log in to unmask]
www  http://www.ipc.org

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>From IPC-D-275


4.2.1 Through-Hole Mounted Leads in Holes--- Component leads,
jumper wires and other leads shall be mounted such that there is
only one lead in any one hole except as specified in 4.8.2.
Component leads in unsupported holes shall be required to extend
a minimum of 0.5 mm [0.02 in] and a maximum of 1.5 mm [0.06 in]
from the surface of the plating or foil. Component leads in
plated-through holes shall be required to extend from a minimum
of flush with the surface of the plating to a maximum of 1.5 mm
[0.06 in] from the plating surface.   The straight-through leads
on connectors or other devices with tempered leads shall extend
from  0.25 mm [0.010 in] to +2.0 mm [0.08 in], provided there is
no electrical or mechanical interference.   

4.8.2 Bus Bar--- Bus bars are usually in the form of preformed
components that are part of the printed board assembly and serve
the function of providing most, if not all, of the power and
ground distribution over the board surface. Their use is
primarily to minimize the use of board circuitry for power and
ground distribution and/or to provide a degree of power and
ground distribution not cost-effectively provided by the printed
board.   The number of conductor levels in the bus bar, the type
and number of their terminals, the size and finish of their
conductors, and the dielectric strength of their insulation
depends on the application. However, these parameters should be
clearly defined on the procurement document for these parts.
Whenever possible, their interface with the printed board should
be at plated-through holes, while conforming to conventional lead
size-to-hole and lead bending requirements (see 4.1.10). Also,
for optimum board design efficiency, the bus bar terminals should
interface with the board on a uniform termination pattern, share
the same holes as an integrated circuit and may be placed under
an integrated circuit.