Thank you for the link. The complete answer is there.
I find the Rockwell site rather impenetrable and wasn't able to find that on my phone out here in 3g land.
I have a dead Micrologix 1100 that has a memory module installed. Will a new identical processor work by just swapping out the module or does the new one have to be configured first? IP, configuration, etc?
Belt tension is critical.
One set of belts a few thousandths deeper in the grooves will cause that motor to run faster and draw less current than the other motor.
Once V-belts are stretched and broken in it's less of a problem if the mounting is solid.
This application is common in the crusher...
I had an experience with this phenomenon years ago at the beginning of my career.
We were sent out to wire a large submersible well pump, something along the lines of 200hp. When we got to the site there were three individual conductors stubbed out of 3-1" threaded hubs on the top of the...
70E says at certain energy levels operating a metal clad switch over 1kV with the enclosure doors closed requires Category 2 PPE.
I don't believe that 70E addresses "arc resistant" gear, any 70E experts care to comment?
skogsgurra makes some good points. I might also add that NEC requires "any" power source to a machine have it's own equipment ground. Example would be a machine that has a 480v 3 phase supply plus a 120v circuit for an immersion heater, controls, etc.
Don't confuse bonding the grounding...
milwaukeebob:
If I understand correctly what you're asking :
It is common to see large (Size 5 and up) contactor coils operating at primary voltage (480) using the 120 volt coil relay as a dry contact. I took a current reading on a Size 5 120 volt contactor once and saw 7 amps. That's a big...
peebee,
I'm sure you looked in these three articles, but;
358.12(5)states EMT can't support luminaires (fixtures).
I don't see anything prohibiting IMC or RMC in 342 or 344.
I chased 310.11(B)(3) to 314.23(F)exceptions and thought I had it until I got to exception(d), 12" maximum dimension in...
Does the main breaker for the area that is tripping have a Ground Fault trip unit? If so it is likely to trip at lower fault levels to ground than the breakers downstream of it.
This is a great question. Here's how I see your problem, ignoring the fact you're using a lighting circuit. That fact might not be a violation of NEC, I'm not sure, but if your machine faults you take the chance of losing lighting in the area.
The main issue with the NEC that jumps out at me...
I also have inherited several ungrounded 480v delta systems at mine sites, ranging from 150kva to 2000kva. The best (and very inexpensive) monitor I've found is manufactured by Symcom Inc. Visit http://www.symcominc.com and check out their products.
They will do a modification of their 102A so...
NFPA 79 "Electrical Standard for Industrial Machinery" 2002 Edition "5.3.3.1.", requires the disconnect to be capable of being locked in the open position independent of the door position. It also states that the disconnect must be operable by qualified persons without tools...
Busbar gives two examples of disconnects commonly used in industrial panels. Lots of the "rod operator" types don't allow lockout like the example he sites does. When you open the door, your lockout point essentially goes away.
NFPA 70E, "5-1.3.1 Individual Qualified Employee...
I agree with REDDOG, a wireway would clean this mess up. It also appears that the load side conductors from the two added disconnects appear to pass through the original disconnect. A disconnect isn't a pull box. NEC 312.8 prohibits it ("unless adequate space for this purpose is...
