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Drawing Fault Trees: Gates and Events

Gate symbols represent results of interactions among contributing failure events and can vary among tools. Basic gates used to construct the Fault Tree can be seen below:

Gate Symbol	Name	Causal Relation
	OR	Output event occurs if any one of the input events occurs
	AND	Output event occurs if all input events occur
	BASIC	Basic event for which failure data is available.
	INTERMEDIATE EVENT	System or component event description
	TRANSFER	Indicates that this part of the fault tree is developed in a different part of the diagram or on a different page.

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