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Nate Nagel

On 10/31/2013 03:49 PM, wrote:
On Thu, 31 Oct 2013 08:36:12 -0700 (PDT), Pavel314
wrote:

Our greenhouse heater wore out after a number of years so we bought
a replacement. It's essentially the same heater except that the new
one is a different color and the plug is a different configuration.
The old one has one round pin and two flat blades, with the blades
at an angle to each other and above the round pin. The new one also
has one round pin and two flat blades but the blades are lined up
with each other, so I have to replace the receptacle with one that
matches the new plug. Not a major project, just a minor annoyance
and expense.

I've seen other 220 volt plug configurations; some have an L-shaped
blade instead of the round pin, others have four blades in a
circular pattern which lock when turned, etc. Is there any
practical reason for all these variations?

Paul

Are you sure the old heater was 240v? The plug you describe is a 30a
120v plug.

The new heater would "work" on 120v but at about 1/4th the output.

just after I posted I realized that it might in fact be a TT-30 not a
10-50. Definitely needs more investigating. Is the old heater still
available for inspection?

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