spacing between bare metal parts

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peace

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Hello

I went to a substation to check automatic transfer switch then I found that there is no distance between the terminal lugs for load and normal power sides. The contractor installed a rubber as insulation between the terminal lugs and I think it is not a listed rubber.

So can I use table 408.56 in NEC 2005 as a reference to determine the distance between terminal lugs?
Is the opposite polarity mean the different phases?

Your help is highly appreciated
 
hello petersonra & cpal
sorry for being late

Three phase cables for load & normal power supply were terminated by terminal lugs in the terminals of Automatic Transfer Switch & this switch was relocated to new substation. This switch is manufactured but it looks old brand. The distance between terminal lugs about 5 mm & the contractor installed a rubber as insulation between terminal lugs
 
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