Performax Supermax sander 25x2

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Forum topic by scherisho posted 12-04-2017 02:45 PM 1271 views 0 times favorited 2 replies Add to Favorites Watch
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3 posts in 945 days

12-04-2017 02:45 PM

Topic tags/keywords: sander drum performax 25x2 dual

Hi everyone,
I have a question I was hoping a member could help me with. I recently acquired a Performax Supermax 25×2 sander for free. I’ve had to put some $$$ into it as it was not stored well and some things have rust and pits. Anyway… my question is regarding the electrical connection. I live in MN and I’ve contacted the new Supermax tools company for parts and electrical info. I’m told I need a 30amp circuit. I was also told I need a 4 prong plug, 2 hot, 1 neutral, 1 ground. All of this makes sense. Except for my machine has a 20 amp 240v plug with only 3 prongs. I know the plug was replaced by someone else as there is a price tag on it. The electrical cord going into the main control box is 12/2 (2 hots and one ground). For a 30 amp circuit I thought the cord should be 10 gauge??? On the circuit board there are only 2 connections and a ground. I have a feeling on the older designs they used only 3 wires instead of 4. Here’s what I’m hoping someone can help me with. If anyone has this sander would you be able to post a picture of the correct plug and cord gauge for me? I always thought 10 gauge was for 30 amp and 12 was for 20 amp. I don’t want to put a 30amp plug on the machine when it was meant for 20amps.
Thanks for all of the help everyone,
I really appreciate it.

2 replies so far

View Blindhog's profile


157 posts in 1818 days

#1 posted 12-04-2017 03:28 PM

20 amp for 3 PH and 30 amp for single PH service.

Here’s the manufacturer link…..................

-- Don't let perfection get in the way of plenty good enough

View Lazyman's profile


5384 posts in 2157 days

#2 posted 12-04-2017 05:19 PM

If yours doesn’t have the 4 wire connections, it could be it predates this config or possibly the previous owner replaced the motor? Look at the amperage on the motor’s label (plus the amperage of the feed motor). 5 HP, 1-phase motor may be approaching the 30 amp limit even without a feed motor or other electronics.

Probably not the exact the model you have but you can find a current manual here. Sounds comparable at least.

Page 6:
The neutral wire (white) in the power cord to the
sander is not used and does not need to be connected
on four wire 220V single phase (angle connector)
or five wire 220V three phase power connections.
Please see wiring diagrams on pages 36
and 37 for details.
Single Phase: The drum(s) of all SUPERMAX
single phase sanders are powered by a 5 HP, 208-
230 volt, single phase motor. A NEMA 14-30
plug and cord is supplied. Included with the
sander is a NEMA 14-30 flush mount receptacle
to use with the sander. Single phase SUPERMAX
sanders require a minimum dedicated circuit of
10-gauge wire protected by a 30-amp fuse or
breaker. Extension cords are not recommended,
but if used, should be of at least 10-gauge wire for
lengths up to 10’ and of at least 8-gauge wire for
longer lengths.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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