Quality Electrical and Lighting Engineering
Technical
Step Down Transformer 1000V or Less 75kVA example
75kVA, 480 delta-208/120 wye Primary Amps=90.2A Based on 450.3(b) Primary OCPD=90.2*2.5=225A; set to 225A Primary wire size=1 set of 3#4/0 CU Secondary Amps=208A Secondary OCPD=208*1.25=260A; set to 250A Secondary wire size=1 sets of 4#250kcmil CU The secondary conductors are governed by a series of rules in 240.21(C), which are each analogous to each of the tap rules in 240.21(B). The secondary conductor extends from the [...]
Pilot FriXion Pens
Pilot FriXion pens are so handy but some times they don't work like they should. If your Pilot FriXion pen is not writing properly, it's very possible the ink has dried out. Here are some ways to get your pen to working again: Moisten the tip. A good way is to moisten a paper towel or napkin and dab the point of the pen in [...]
Have Questions?