I recently obtained a Franceformer 9000 kv 60 ma Neon Sign Transformer with
a GFI built in. I opened it up and removed the GFI, which was in a separate
compartment. However, I have questions on how to properly connect the
internal wires for the NST.
There were 7 wires. A green wire, which was connected to ground. A white
wire, connected to the neutral input terminal, and a black wire, connected
to the hot input terminal. There was a blue wire with approximately 1.8
kOhms of resistance between it and the first output terminal. There was a
blue wire with white stripes, which has 1.8 kOhms of resistance between it
and the other output terminal. There was a orange wire and a orange wire
with black stripes, and they had approximately 1.8 ohms of resistance
between them. Finally, both orange wires were connected to the neutral
input terminal.
From this, I concluded that the blue wires were the ends of the secondary
windings, so I connected them together and then connected them to ground,
to make a midpoint grounded transformer. I also concluded that the orange
wires were the ends of the primary coil. I tried connecting the black hot
wire to one and then the other orange wire. The first orange wire drew an
arc between one output terminal and ground, and the other orange wire drew
an arc between the other output terminal and ground.
From this, I concluded that the neutral wire must be connected to the
midpoint of the primary coil, because otherwise there should have been a
short when I connected the black wire to the orange wires. Then I connected
the hot wire to both orange wires, and the NST began to act like a normal
NST - it drew arcs from both terminals to ground.
However, the white neutral wire is not being used. Is this supposed to
happen? I am assuming that the neutral wire was only used for the GFI, and
that I can safely ignore it. However, I also think that it could be
connected to the midpoint of the secondary windings.
Could you check my assumptions - especially the assumption that I can
safely ignore the neutral wire?
Thanks,
Adam
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