IEEE 1584 FUSE EQUATIONS
IEEE 1584-2002 provides formulae for calculating arc-flash energies for use with current-limiting Class L and Class RK1 fuses. What is the manufacturer of the fuses used to develop the formulas in IEEE 1584? Do the formulas apply for 440V 50Hz? Check the link below for answers to these and more fuse related questions:
How to quantify the time that should be entered for the duration of motor contribution into an arcing fault?
NEW GRAPHICS PER THE 2015 NFPA 70E
In the past, the images that include the prohibited approach boundary were used for arc flash labeling. Since the NFPA has discontinued use of the prohibited approach boundary definition, it is recommended to bring arc flash hazard labels up to date with the terminology in the standard. Check the link below for an example of image with only the limited and restricted approach boundaries along with the arc flash boundary shown and accompanying discussion:
2015 NFPA 70E CHANGES
The new 2015 Edition of NFPA 70E has been recently released. The following is an article listing the major changes for the 2015 edition. It was originally published in the May 2014 issue of Electrical Contractor Magazine and is provided here as a resource for your use:
2015 CSA Z462 CHANGES
CSA Z462-15 has just been published and is now available on the CSA On-line Store. The following is an overview of the major revisions to the 2015 edition:
ARCAD's arc flash calculation software program has been updated in order to conform to the new NFPA 70E and CSA Z462 standards. The most important changes and new program features are listed below:
- Nominal system voltage for shock hazard assessment has been revised reflecting changes to NFPA 70E table 130.4(c)(a)
- All references to the prohibited approach boundary have been deleted throughout the standard and the AFA V5.0 program. Once the restricted approach boundary was crossed, there were no other requirements in the NFPA 70E 2015 edition.
- All label layouts and terminology have been rearranged to meet the new standard requirements.
- Personal protective equipment (PPE) recommendations displayed on labels created using the program can be reviewed, edited or reset to default values. The feature will let you making necessarily PPE adjustments required for various tasks in English and a variety of other languages. Also, the PPE requirements in new NFPA 70E standard have changed from previous editions of the standard. They may become different again and the feature will let you make changes as the safety standard evolves without the need to purchase new program.
- The program is now memorizing selected label style (including label size, text color, style), optional extra line title, value etc.
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