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I have a stituation with one of my electrical engineers. The problem is with the design of his power destribution for branch circuits and the gauge of wire to be used. The rule-of-thumb that I was taught was that the wire going to the branch fuse needs to be the same size (gauge) as that from...

I have a 3 phase induction motor that has a brake. I'm conrolling the motor with Mitsubishi VFD. We seem to be getting some noise from the brake when it is activated. I would like to know what kind of device can I use to filter the DC voltage. The control voltage the brake is 24VDC.

I'm designing a conveyor system. On this system I have 11 sub-enclosures and one main enclosure. The power for the systeme is 208VAC, 3 phase, 4 wire, 60 Hz, 60 amps. Also there's 4" X 4" (hoffman) wireway (layin type) that connects all the enclosures together. The question that I...

I am working on a project that has one main electrical, and four sub-enclosures. The main houses the main disconnect and fuses. In the sub-enclosures theres fusing for the enclosure and motor controls (motor starters). My question is this; in the main enclosure the disconnet interlocks the...

I am design a part assembly conveyor. The conveyor will be running off 208VAC, 3 PHASE, 4 WIRE. The total length of the conveyor is about 90 feet long. The conveyor will have to split it in half (due to shipping and installation purposes). Thus, the power line will have to be broken, and I...

I have aluminum wire lugs and wnat to connect 6 AWG wire that is copper. Is it ok to combine the two materials.

Can anyone tell (per NFPA) what is the maxium run length for liguidtight flexible nnmetallic conduit.

I'm designing a conveyor sysetm, the voltage for the system will be 208VAC, 3 Phase, 4 Wire. The system will be modular in respects to the with the electrial destribution and I/O. My question is as follows: If I have one or two contactors (to run motors) in the same enclosure, due I need to...

Where can I find or can someone explain the difference between CLASS 1, CLASS 2, and CLASS 3 grounding.

i have just purchased a building and on the final walk thru noticed an outer wall of 1st floor is bowing out about a foot and a half. it is on the first floor of the building which is 3 stories high. this arching out of the wall begins at about floor level on the first floor and seems to end at...

we have a historical restoration in process. the roof and and the two floors in the structure are shot-collapsing. the walls appear solid and could be saved. we were wondering if anyone had any economical solutions for bracing/supporting the walls during demolition and reconstruction. we are...