These are some of the latest topics on various aspects of arc flash you may find interesting:
DC ARC FLASH MODELING AND ITS IMPLEMENTATION IN DCAFA V3.0 SOFTWARE PROGRAM
Except for two technical papers referenced in the annex of NFPA 70E, DC arc flash equations and calculation methods are not yet part of any standard. As research on DC arc flash and DC source modeling continues, DC arc flash calculation methods will likely become part of a standard someday.
SINGLE PHASE ARC FLASH ANALYSIS
There are very few software packages in the industry that can model single-phase arcs for the purpose of determining incident energy in substations. ARCAD has recently released new ArcMaster software program. The program performs comprehensive study by taking into account system voltage, available fault current and the fault power factor, equipment type, working distance and protective device time-current characteristics. The new software program is applicable for single- and three-phase systems with voltages from 50 to 30,000V AC, short circuit fault currents from 200A to 50kA, the fault X/R ratios from 0 to 50, conductor gaps from 1 mm. up to the maximum value where the arc can likely be sustained under the specified system voltage, available short circuit fault current and power factor expressed in terms of the fault X/R ratio.
ELIMINATION OF HRC "0"
Category 0 was removed from new NFPA 70E PPE tables because the new PPE table only specifies work within the arc flash boundary. HRC 0 would mean the worker was outside the arc flash boundary and did not need arc-rated PPE or clothing. According to note (14) on page 7, "Hazard/risk category 0 has been removed from Table 130.7(C)(16)… Hazard/risk category 0 was deleted because the new PPE table only specifies work within the arc flash boundary. If there is no arc flash hazard, then no arc flash PPE is required and it is therefore not necessary on a table devoted to PPE."
CUSTOM LABEL GENERATION AND PRINTING SERVICES
ARCAD INC. offers many options of custom printed arc flash labels. Our vinyl labels are 100% waterproof, are suitable for use on equipment that will be subjected to wet or humid environments and come with up to five (5) years warrantly. We use UV resistant paints that withstand the heavy wear and tear ordinarily inflicted by the Sun. As you shop around for the best arc flash labels, make sure you request samples. When you compare our arc flash labels to the major competitors in the market, you will see and feel the difference. While some companies offer you paper-thin easily torn arc flash labels, we offer you 4mil thick vinyl labels with superior print and durability.
HOW TO PROPERLY APPLY AND REMOVE VINYL LABELS
When installing vinyl, it is important that you apply the product to an adequate surface, one to which it will readily adhere. The good news is vinyl will stick to many surfaces. In determining whether your intended surface is adequate, keep in mind that, as a general rule of thumb, vinyl will stick to almost any surface that is clean and either smooth or nonporous. To demonstrate the necessary surface qualities, we use glass versus brick as a quick example. Vinyl will stick very well to glass because of its smooth surface. On the other hand, due to its rough exterior, vinyl will not stick well to brick. The following lists contain a brief summary of acceptable surfaces along with some surfaces that are not.
Thursday, January 21, 2016
Monday, January 4, 2016