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Spinlab Utility Instrumentation


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Model 600-LB1 Load Box

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CT Testing (Ratio Burden Tests)
CT Testing 3-Phase Meter Test
Load Box
CT Demagnetization


Load Box Cable Accessory

CT Testing

Voltage Bar testing

Cable Accessory

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 load.

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.

Model 600-LB1 Load Box


Some additional applications for Load Box are:

  • Checking CTs on the bench before hooking them up in a circuit.
  • Testing a new installation before a load is applied , saving a later trip back
    to the site.
  • Performing a meter verification test using the Bird Dog Plus on
    no load sites.


Input Voltage

120 volts, 240 volts, 480 volts AC


Switch Position



Output Current Note1

all switches Off

10 Amps

0% to 5%

1 switch On

20 Amps

0% to 5%

2 switch On

30 Amps

0% to 5%

3 switch On

40 Amps

0% to 5%

4 switch On

50 Amps

0% to 5%

Output Current Note2

40 foot

40 Amps

0% to 5%

70 foot

30 Amps

0% to 5%

100 foot

20 Amps

0% to 5%


Note 1:

These readings are dependent upon a 12 foot cable length

Note 2:

These readings are for longer cable lengths (current ratings shown are maximum)

General Specifications

Open Circuit Voltage

5 Volts RMS


50Hz or 60Hz

Operating Temperature

0F to 120F


3 Amp Slow Blow fuse


8" x 8" x 8"


16 lbs


Input Voltage Proportional to Output Current Table

Input Voltage

Tap Connection

Output Current

100 Volts

120 Volt Tap

.833 x Nominal Readings

120 Volts (Nominal)

120 Volt Tap

10, 20, 30, 40, 50 Amps (Nominal)

208 Volts

240 Volt Tap

.866 x Nominal Readings

220 Volts

240 Volt Tap

.917 x Nominal Readings

230 Volts

230 Volt Tap

.958 x Nominal Readings

240 Volts

240 Volt Tap

Nominal Readings

277 Volts

480 Volt Tap

.577 x Nominal Readings

347 Volts

480 Volt Tap

.723 x Nominal Readings

415 Volts

480 Volt Tap

.860 x Nominal Readings

480 Volts

480 Volt Tap

Nominal Readings

600 Volts Note*


Please Note *: Do not use at this voltage level or above!!!


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Macey's Electrical Pty. Ltd.
ABN 17 344 601 468
Unit 1, 49 Gavenlock Road, Tuggerah, NSW Australia 2259
Phone: +61 2 4353 4644    Mobile: 0412 678 925