Indicator fuse block . Reading secondary voltage with no fuses installed .

[Davebones]

We have a transformer ( 480 to 400 volt ) that feeds a machine on the floor . We installed a enclosure next to the transformer for the fuse block . We installed a Littlefuse LFJ600303CID indicator fuse block . We haven't installed fuses in the fuse block yet but we saw we have 88 volts to ground and 125 volts phase to phase on the secondary side of the fuse blocks with no fuses installed . We replaced this fuse block with a non-indicating fuse block and have 0 volts on the secondary . Just curious if anyone has seen something similar to this ???

 

[petersonra]

We have a transformer ( 480 to 400 volt ) that feeds a machine on the floor . We installed a enclosure next to the transformer for the fuse block . We installed a Littlefuse LFJ600303CID indicator fuse block . We haven't installed fuses in the fuse block yet but we saw we have 88 volts to ground and 125 volts phase to phase on the secondary side of the fuse blocks with no fuses installed . We replaced this fuse block with a non-indicating fuse block and have 0 volts on the secondary . Just curious if anyone has seen something similar to this ???

the indicator blocks have a neon bulb in them that is high impedance so there is some leakage. You will see this leakage if you measure the voltage with a high impedance meter like most digital meters.

 

[Jraef]

the indicator blocks have a neon bulb in them that is high impedance so there is some leakage. You will see this leakage if you measure the voltage with a high impedance meter like most digital meters.

And the flip side is that if you were to measure it with a Wiggy or Knopp tester, it would show zero volts.