I have heard this rumor of a government mandate that all future electronic & electronic ballasted lighting equipment is to be "EMP" fortified against these pulses by double pole switches and integral hot-to ground & neutral-to ground surge suppression to a non-switched ground. Any merit to this...
Here is the situation, 75kVA 480/208 3-phase transformer (lightly loaded) feeding panel board ~10 ft away. On one branch circuit ~20' away is loaded with a desk type electronic paper stapler. The stapler goes WAP! and the t-8, electronic rapid start luminaries blink. customer is annoyed. Would a...
I hesitate to ask here, but, would like some independent feedback before shelling out the bucks.
The software I am considering is designmaster electrical. It is an add on to autocad, and appears ideal for the type of electrical construction drawings that I often do.
Thanks in advance, I have...
Trace engineering was a producer power inverter technology that It was truly leading edge, ahead of it's time bullet proof stuff. But, somehow they sold out to the foreign mass production interest Xantech. Word on the street is that there is no new innovation. Basically fired the engineering and...
It is late and I am confused.
I am looking at a 3-phase 208/120V ~12kW diesel generator with
say L1-L2 loaded with a 208/240V single phase isolation transformer.
The 240V secondary is feeding a series stacked pair of invertors that I can program to max load the input A/C in at 20A each or...
This question applies to the state of California, USA. It has come to my attention that a local architectural draftsman, doing commercial work, including the electrical sheets has been getting jobs through the city/county. These drawings including electrical, are blanket stamped by a registered...
I have an owner builder breathing down my neck. I have a call into the SB CA inspector, a new county for me, hoping for a response. NEC 2002 code applies. Mini Mart Gas Station, 5/8 gypsum over wood framed construction. I consider this NEC type II construction, no flammable vapors that I know...
34.5/4.8kV- 400A-10sec rated neutral ground resistor caught on fire after replacing a blown overhead line fuse. Sub main protected with 51G did not open, apparrently due to blown control circuit fuse feeding main breaker. Feeders protected with 51N. None opened. Initial call was for submersible...
I have a real dilemma. Tasked with a design study to provide a phased in approach to repair/replace several decrepit substations that have obsolete oil-blast breakers and leaking hulks of 1940’s era PCB laden transformers. Very tight budget. Rather difficult to approach as the switch gear...
There is an installation that has my concern. A 34.5kV O/H line extension, dip with fused c/o to a 34.5kV to 4.8kV (1500KVA) dist. transformer X0 grounded to rudimentary ground ring. 3-wires up to another fused c/o and then more O/H secondary distribution line to multiple facilities. No Switch...
