Have you ever driven an hour to a test site only to
discover that the site had little or no load? With
the Spinlab Load Box the Bird Dog Plus can test
every site, even if there is no load or a very light
In-service testing is the only way to thoroughly
test a meter circuit site. If there is no load or a
very light load, a proper ratio/burden test cannot
be performed. Now with the Load Box, you can load a
CT enough to completely test the meter circuit.
simply take the current cable from the Load Box,
wrap it around the CT, switch from 10 amps to 50
amps through the CT, and perform a meter circuit
test the same way as usual. The Spinlab Load Box is
usable with 120V, 240V, or 480V service and is good
on donut or bar-type CTs.