On 12/28/2022 7:27 AM, Paul Christensen wrote:
"Neutral to chassis ground and ground, ground, ground everything together, and to
the 240 ground coming into the power supply."
That's what ETO did in the Alpha 70/77 series amps. It's not strictly a NEC
violation because NEC is a premise wiring and safety standard, and not a
product wiring standard.
If there IS a neutral, it must NOT go to the chassis, because it places
a second bond on the system. In any power system, neutral must be bonded
to ground at one, and ONLY one point, within a rather limited distance
from the service. That bond is most commonly in the main entry panel.
Steve is correct, it IS a violation for neutral to carry load current.
It used to be allowed, but code was changed many years ago, and older
equipment is grandfathered.
Use the common connection point between two 120 volt windings, wired in series,
on the input of the HV transformer for 240 use.
Yes, another common scheme.
That's what K4XU did in the original Ten Tec Titan to run the blower.
73, Jim K9YC
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