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Duct Smoke Detectors | Information by Electrical Professionals for . . . We are receiving feedback that mechanical contractors typically furnish and install the duct smoke detectors and the only responsibility the electrical contractor has is getting the fire alarm wiring to the duct smoke detectors 2 When a fire alarm system is not present, we will typically design a 120 volt circuit to power the duct smoke
How far from a Transfer air grill should a smoke detector be? Somewhere around 2003 the mechanical code had to come up to date for energy code reasons IIRC Hence, the mechanical contractors started installing a central return air system which saved them from having to duct return air So, a central RA system, yes it is more noisy than a fully ducted system, becomes the norm
TC or Tray Cable | Information by Electrical Professionals for . . . (7) In industrial establishments where the conditions of maintenance and supervision ensure that only qualified persons service the installation, and where the cable is continuously supported and protected against physical damage using mechanical protection, such as struts, angles, or channels, Type TC tray cable that complies with the crush
ENGINEERING CATEGORIES - What Can They Certify Working on a HVAC inspection, where the contractor cut several roofs supports to install an attic HVAC system The AHJ requested an engineer stamped plans to correct the mistreatment of the structure The homeowner hired a "Professional Engineer" who provided a set of plans Can this
Typical contractor markup on material | Information by Electrical . . . Bottom line is if two contractors bid same job at nearly the same price but one marked materials up at a different rate than the other - the one with lower markup had added more to the bid in other areas But cost to customer was still same either way
ELECTRICALLY HELD VS. MECHANICALLY HELD CONTACTOR In a super quite area like a broom closet in a library you might hear the coil "hum" from a electrically held device so a mechanical one would be preffered In a basement boiler room who care about noise Life of the coil is not really a concern for most vendors
Ansul system wiring with contactors exhaust keeps on everything else . . . 5 If gas, mechanical or electric valve and reset box? 6 Temperature probe in duct and timer module? 7 Horn strobe or connect to fire alarm system? 8 Any of this existing or is it an all new installation? Some answers might trigger more questions
Wire through mechanical lug | Information by Electrical Professionals . . . I know that the THHN is the issue but can the wire run through a mechanical lug (over the bolt infact that attaches the mechanical lug to the transformer casing) and then terminate to the xo? Doesn’t seem that that’s what the lug is designed for
P. E. Exam requirements | Information by Electrical Professionals for . . . I must say after reviewing the requirements for taking the PE, what a load of ^$#%$#@#@^ What are your thoughts on this subject First You must have an engineering degree ANY engineering degree from an ABET school So you get a degree in Electrical Engineering, learn about microelectronics