I don't know how to resolve "15 nodes" and Bussmann Pt to pt.
The brochure is available here.
Link Bussmann point to point.
I suspect that by the time you get done programming an Excel spreadsheet to follow the point to point method, you will be very expert.
Link Cooper Bussmann software...
Ahhh - I can't see the pictures
(edit to addOkay - just reloaded and now I can
Harmless flakes working together can unleash an avalanche of destruction
ASSFLOWA -
Where is it leaking? Slobbering out the stack?
Valve cover gaskets or the like?
Harmless flakes working together can unleash an avalanche of destruction
Look at 430.32.A.1 and 430.32.C
Overloads are set by the specific motor nameplate FLC, not from T430.250.
However 430.250 lists 27A FLC as typical for a 20 HP
As an example:
Using a 20 HP motor, 27A flc and 1.15 sf, the overload normal setting is 125% X FLA = 1.25 X 33.8A
And, per 430.3.C...
I work under US law and NEC. If you are not, substitute what fits.
I'm a field dog, not a designer. And I'm getting ready to retire after 50 years of this. Could be there is much better, more current thinking:
PE ticket requires 24 hours CE biannual. Electrical Administrator (called a...
Bill -
You get to say anything you want.
Apparently if I disagree my post gets deleted.
Interesting concept.
Unlike you, I could be in error. That was 35 years ago and I was not the engineer of record.
Just curious - Where were you in 1985 - 1987? This was in Sitka.
We did have a guy named...
...the control is calling for UP. Operator holds the control back - in fact repeatedly banging the handle back. Grapple drops, cable unspools. &*%$@#%
We fixed the controls so the brake came on any time the VFD stalled. Slowed down the ramp rate on the VFD. And the operators learned to...
Disclaimer: All my experience is with CI, D1, or D2 - no Zones. So there could be minor differences.
I have never seen oil filled transformers in classified areas. Probably because of all the protective switches, oil level, winding temperature, rapid rise ... I've never seen any that were...
Assumption: installation is per NEC 2017
NEC sections are 210.21 and 210.23
The short answer is to put in a DPDT 60A Switch, such as a generator transfer switch
example SQD DTU223RB List price is $1300
Residential example:
Home Depot 100A GE, Nema 3R
$140
You didn't ask, but there are...
Thanks for the response. I wasn't ignoring you, just out on a job for a few weeks.
So, no known supplier?
Harmless flakes working together can unleash an avalanche of destruction
Has anyone seen fine strand aluminum - copper coated strands, 2/0 - 350kcmil range? I envision something similar to DLO.
I have heard of it. However, I have never seen any.
Has anybody heard of a supplier?
Harmless flakes working together can unleash an avalanche of destruction
As discussed, utilities set up to where smoking conductors and the occasional flaming transformer are acceptable. They are not bound by the NEC.
Us mortals on the customer side of the service are not only bound by the NEC. Generally our customers (industrial in my case) insist that the...
Sounds pretty good. Couple of minor points, that I think you know (refer to my posts, May 2, May 3)
If this is per the NEC, Article 460 is the guide for selecting Conductor Ampacity, Disconnect, and fuses.
And of course 240.21.B tap conductors
The numbers you have picked out meet Art 460...
One of my clients has a 138kv service 385 MVA. The client owns the xfm,13.8kv, 20 MVA, 8%
Another has 69KV service, 100MVA, xfm 13.8kv, 20MVA, 8%Z.
These are both really little utilities and the clients are at the end of a long line. The xfm impedance pretty well overwhelms the effect of the...
...we can discuss that.
AM: No, we want what we discussed.
Me: Then budget is not my problem - it is yours.
AM: (About to have an apoplectic fit) &*#&^^
VP: Worm is right. Budget isn't his problem. Uh Worm, think you could work with him the get the specs to meet the budget?
Me: Of course...
