An Incident Energy

Incident energy analysis process.

An incident energy.

Solar sciences refer to the amount of incident energy absorbed by objects meaning the amount of solar energy they take in. This is a major part of the design and refinement of. The unit of incident energy is cal cm 2. A contractor has downplayed an incident which took place during work to dismantle what s left of the buchan alpha oil rig after footage appeared online.

While incident energy is everywhere it is most commonly associated with a few specific things. In the united states an analysis of the potential incident energy that a worker could be exposed to in the case of an arc fault is a requirement under osha standards 1910 and 1926. These are the steps to include in an incident energy analysis process. Incident energy is a measurement of energy usually heat striking a surface.

In most cases the incident energy depends on three elements. The standard ieee 1584 ieee guide for performing arc flash hazard calculations provides the equations used for the calculations usually performed with arc flash software. This step is used to adjust the incident energy from the normalized 24 inch 610 mm working distance to the actual working distance d used for the equipment under study. Incident energy is a measure of thermal energy at a working distance from an arc fault.

One cal cm 2 is equivalent to the amount of energy produced by a cigarette lighter in one second. Each of the tasks listed is a crucial component of a complete analysis and it s very important that each is performed thoroughly and properly to create an accurate study. The working distance is the distance from where the worker stands to the flash location. If you were sitting near a campfire the warmth you would feel would come from the radiant heat of the fire and it could be measured in terms of incident energy.

Incident energy is the amount of thermal energy projected onto a surface at a distance from the source produced during an electric arc event. The most common distance for which incident energy has been determined in tests is 18 inches. Incident energy worksheet b is used to convert the normalized value to an incident energy at a specific working distance and arcing time used in the study. The intensity of the source of energy.

The unit of incident energy is cal cm 2 the threshold value of incident energy for 2 nd degree burn of the human skin is about 1 2 cal cm2. An understanding of the potential incident energy that could be generated by a system is important for knowing the amount of protection needed against arc faults. Figure 3 shows the incident energy analysis process. It is the incident energy that causes burns to the human skin.