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The contractor has the responsibility for assuring that a workplace is free from recognized hazards and is a safe place for electricians and installers to work This could apply to such factors as the quality of ladders or scaffolding at the site or the need for safety goggles or face masks when performing certain kinds of work For example, eye protection should be worn during any grinding or cutting operations that could result in flying chips of metal, and proper face masks should be worn by anyone performing burning or welding that could result in the release of toxic gases Designers, engineers, contractors, electricians, or equipment installers and all other persons whose work is governed by one or more standards should be familiar with and know how to apply the rules found in all of the applicable standards These are the rules that relate to design, including safety considerations, for a particular project or task

3 Select the Show Pictures In Random Order check box This causes the picture to be displayed randomly 4 Click Save This saves your changes and returns you to the Settings window 5 Click the Windows button in the upper-left corner to return to the Media Center main screen At any point during a slideshow, you can right-click the window to display a shortcut menu From the shortcut menu, choose Settings to access the main Settings window

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- (void)observeValueForKeyPath:(NSString*)keyPath ofObject:(id)object change:(NSDictionary*)change context:(void*)context { NSLog(@"Property '%@' of object '%@' changed: %@",keyPath,object,change); } @end Chameleon *chameleon = [Chameleon new]; Watcher *watcher = [Watcher new]; [chameleon addObserver:watcher forKeyPath:@"color" options:NSKeyValueObservingOptionNew context:NULL]; chameleon.color = [NSColor greenColor]; Output: Property 'color' of object '<Chameleon: 0x139330>' changed: { kind = 1; new = NSCalibratedRGBColorSpace 0 1 0 1; } Here s what happens in Listing 19-1: 1. 2. 3. 4. The Chameleon class implements a property. There s nothing special about the property, other than it conforms to the Key-Value Coding guidelines. The Watcher class implements an -observeValueForKeyPath:ofObject:change:context: method. This makes it eligible to be a key-value observer. The watcher object registers to be an observer of the chameleon object s color property. When the chameleon object s color property changes, the watcher object receives a notification that tells it the property (key path) that changed and the new value.

That s Key-Value Observing in a nutshell. Any object that implements an -observeValueForKeyPath:ofObject:change:context: method can register to observe almost any property of another object. Whenever the property changes, the observer receives a notification.

Electrical specifications for buildings or projects are written legal descriptions of the work to be performed by the electrical contractor, subcontractors, and electric power utilities and the responsibilities and duties of the architect/engineer, general contractor, and owner Electrical specifications and electrical drawings are integral parts of the contract requirements for the performance of electrical work Because specifications are a significant part of a legally binding contract, typically involving expenditures of thousands or even millions of dollars, it is important that they be mutually compatible with the drawings and as free as possible of errors or discrepancies It has long been known that even minor errors in wording or intent or the presentation of incorrect data or measurements can result in expensive repairs or replacements of hardware, lost time in the completion of the schedule, and serious project cost overruns due to delays and the need for additional labor and supervision In most engineering and architectural firms, regardless of size, specifications writers are skilled persons with technical backgrounds who report to a responsible project supervisor The preparation of an error-free specification is a time-consuming task calling for the writer s patience and the ability to deal effectively with complex technical details The process might call for many drafts and revisions following the review, comments, and corrections made by persons within the architect/engineering organization with specialized knowledge and experience in each of the trades involved in the project As with drawings, all responsible reviewers are expected to sign the final version that is released for bid Nevertheless, this does not relieve specifications writers of their responsibilities, because they are expected to have sufficient knowledge of the project to make them capable of finding and resolving any discrepancies between the specifications and the drawings Discrepancies are most likely to occur when

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