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The Water Cooler
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220 electrical question
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<blockquote data-quote="Ahall" data-source="post: 4353277" data-attributes="member: 49426"><p>The OP asked about circuit protection for a 5 hp, 220v 17a table saw.</p><p>Woodworking machines in that power class usually have motor starting circuits with electronic relays and overload protection engineered into them when they left the factory. Smaller motors may have overcurrent protection engineered in as well. </p><p></p><p>Before advising the OP to spend time and money on rewiring the house or building electronic devices, it would be prudent to review the electrical gear on the saw.</p><p></p><p>He may have everything needed for electrical safety and to protect the machine without any modification beyond a new plug. </p><p></p><p>If the original starting circuits have been altered or removed, that's another issue.</p><p>Some of the thoughts in this thread are well meaning, but not quite on target.</p><p>The devices used to protect the equipment should be appropriate for the application. The circuit protection for motors typically acts like a resettable slow blow fuse. It tolerates the very high starting current for a brief period, but long exposure to moderate overcurrent trips it. The average breaker is not engineered to behave that way. </p><p></p><p>I, for one want to see what's on the saw, and stop guessing.</p></blockquote><p></p>
[QUOTE="Ahall, post: 4353277, member: 49426"] The OP asked about circuit protection for a 5 hp, 220v 17a table saw. Woodworking machines in that power class usually have motor starting circuits with electronic relays and overload protection engineered into them when they left the factory. Smaller motors may have overcurrent protection engineered in as well. Before advising the OP to spend time and money on rewiring the house or building electronic devices, it would be prudent to review the electrical gear on the saw. He may have everything needed for electrical safety and to protect the machine without any modification beyond a new plug. If the original starting circuits have been altered or removed, that's another issue. Some of the thoughts in this thread are well meaning, but not quite on target. The devices used to protect the equipment should be appropriate for the application. The circuit protection for motors typically acts like a resettable slow blow fuse. It tolerates the very high starting current for a brief period, but long exposure to moderate overcurrent trips it. The average breaker is not engineered to behave that way. I, for one want to see what's on the saw, and stop guessing. [/QUOTE]
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