I have been told this section now requires TWO arc flash labels. One for operating a handle like a disconnect and another for actually opening a live panel ? Is this true and do we have to do TWO arc flash Studies ??
I work at a major East coast university and I want to research what the industry is using for infra red scanning and thermography. The intended use of the equipment will be scanning electrical panels and conductors for hot spots and sources of concern. In addition, we may use it for motors and equipment and exterior wall penetrations. What is…(Show moreShow less)
Most cosmetics are made from animal fat plus petroleum based chemicals. It can be argued that they could be class IV commodities or even Group A plastics commodities. You should consult a professional engineer our your insurance company's consultant regarding this.
Piping not listed for sprinkler system must be manufactured in accordance to the standards mentioned in table 220.127.116.11. However, paragraph 18.104.22.168 states "...meet or exceed one of the standards in table 22.214.171.124 ...". If you could convince the consultant that the chemical and physical properties of the pipe are equal or better than ASTM A53, ASTM…
The NFPA 70 National Electrical Code 2017 edition Article 110.16 (A) General states placing a "warning" label (to me this means a generic label with no calculations) on equipment that likely to require examination, adjustment, servicing, or maintenance while energized. and 110.16(B) state Service equipment 1200amps or more require; Voltage,…(Show moreShow less)
Is this a private inspector or public??? Where is he pulling that from?? What is it protecting?? What fire code and edition are you under?? NFPA 25 defines: 3.6.4* Sprinkler System. A system that consists of an integrated network of piping designed in accordance with fire protection engineering standards that includes a water supply…
Hi there: I have a problem to calculate the Av3 area of dust collector vents due to the effects of inertia using NFPA 68 standard. In equation 8.2.8 of NFPA 68 2007 ed., variables V and Pred multiply to The mass of the vent panel (M ^ 0.6). In contrast, in equation 8.2.7 of NFPA 68 2013 ed.,variables V and Pred divide the mass of the vent panel…(Show moreShow less)