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Originally Posted by WizardOfAz
This sure provoked some interesting suggestions! My favorite is the salt water swimming pool...
These are rectangular concrete resistors, so we can cool them with a slab of steel laid across all of them that will have pretty good surface contact, and keep the full power tests reasonably brief, since at max the resistors will be dissipating about 46 watts of heat each, substantially over their 25 watt rated limit. The steel will also protect from the shrapnel if they blow up....
Bill
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Bill,
I would add a fan to your setup blowing under the steel plate. 25 watt resistors are conservative rating in an enclosed space so with the plate and fan you should be OK for the dissipation. Of course, if you wanted to go the "swimming pool" route, a trip to the store for a couple of gallons of distilled water should add some margin of safety. Pure distilled water does not conduct and is easier to dispose of than mineral oil. When you are done, just add some coffee or tea, sugar and cream to taste, donuts optional.