October Issue 2009

 

In some ways, there is no difference between small and large contractors. Each one earns...


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| October 2009
Article 110 Requirements for Electrical Installations; Article 230 Services; Article 300 Wiring Methods; Article 310 Conductors for General Wiring; Article 314 Outlet, Device,

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| October 2009
The National Electrical Code (NEC) contains many provisions where calculations are involved.

| October 2009
Bilevel switching, in which alternate rows, fixtures or lamps are separately circuited and independently controlled, has been demonstrated in one study to produce 22 percent

| October 2009
Establishing an equipotential zone at the work site—thereby protecting linemen working aloft and linemen, groundmen and equipment operators working on the ground during trans

| October 2009
Programmable logic controllers (PLCS) have been with us for some time—the first PLCs with architecture and functionality like the ones in use now were built in the mid-1970s.

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