[Amps] What to do about 'Neutral' in HB amp?

[Jim]

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.


You mean ground to carry load current?


Thanks, 73, Jim W7RY

On 12/28/2022 12:37 PM, Jim Brown wrote:
> 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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