Throttling on a list-by-list basis

Farm Administrator can disable Throttling on a list-by-list basis.  To do this, run the following:

$web = Get-SPWeb http://webURL
$list = $web.Lists["ListName"]
$list.EnableThrottling = $false
$list.Update()

   
To validate the Throttling settings are effective, run:

$list.IsThrottled

If it returns True, the the List has been throttled and it will have more items then he throtle limit.
If it returns false, it has less items then the Throttle limit or throttling has been disabled via the EnableThrottling property.

To re-enable throttling on a list, simply run
 
$list.EnableThrottling = $true
$list.Update()