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| DUPLEX NAIL
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A two headed nail on one shank, with one head about 1Ú2 inch higher, which is normally used for temporary installations, such as on concrete forms, since the nail can be easily removed with a claw hammer. Duplex nails are available in several sizes with the 16d, which is used for concrete forms, being the most commonly used. |
| DUPLEX OUTLET
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Electrical wall outlet having two plug receptacles. |
| DUPLEX RECEPTACLE
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Electrical outlet with space for two plugs. |
| DUPLICATE
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To double. To copy. |
| DUPLICATE SWITCHING
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Wiring of multiple lighting fixtures in a way that half of the lamps can be worked independently of the other half, allowing for a lessening of the lighting level. |
| DURABILITY
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Ability to survive heavy wear and tear without deterioration. |
| DURABLE POWER OF ATTORNEY
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Legal instrument permitting one to grant others general or specific powers for administering their finances. |
| DURALUMIN
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Trademark name of a strong aluminum alloy. |
| DURESS
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Act of forcing an individual or business to do something against their will and can be used as a legitimate defense in court to reverse the effect of the compelled act. |
| DURHAM SYSTEM
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Trade name of a rigid, threaded joint piping using recessed drainage fittings. |
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