Business Power

I tested the outlet and I got 240v. from the Neu. slot and one hot slot. Three prong outlet. So I fixed that, and wanted to see if the Neu. and Grd. were bonded in the dryer. Just looking at where the cord was landed on the dryer, It didn’t look like it was. So I opened the whole back panel to make sure. I saw the Neu. and Grd. were butt spliced together inside, where you couldn’t see it. So I figured all disconnect the Grd wire screwed to the frame, and cap it off. Plug the dryer in, and check to see if there was any voltage on the frame. There was like 82V. Ok? I didn’t understand why? So in a last ditched effort I screwed the Grd back to the frame like it was. Voltage was gone. Any ideas? Thank you for your help.

I’m doing a new 200 amp residential service installation and am installing 2″ rigid steel conduit for the riser and striking the mast. If I have a full stick of conduit completely supported (inside the wall), is there anywhere in the code that says I can’t continue to the primary side of the meter base in PVC? I’m thinking grounding would not be an issue since it’s feeding the ungrounded utility side of the meter, and can’t come up with a structural reason or find anything in the code addressing it. The reason I ask is an offset will be required to hit the meter base and I’d rather heat up a stick of PVC than deal with bending the rigid steel. I’m in Washington state. Thanks

im doing a hot tub/ above ground 5k gallon pool install. my question is this… i’ve seen spa GFCI load centers that have the required 2 pole 50a GFCI for hot tub AND also space for two additional breakers. isn’t this essentially a sub panel? what i want to do is run #6THHN in pvc from main service with a 2pole 60a to a GFCI spa load center with GFCI 2 pole 50a (hot tub) and 1 pole 20a (pool pump). Are these load centers essentially treated as sub panels by the code? and what are the requirements for disconnect in this circumstance?

I am working on a hotel with ~100 rooms each with their own PTAC (3.1kW electrical back-up). They are controlled with a thermostat and occupancy sensor, and normally run in heat pump mode (7.3 running amps). Is there any demand factor I can use to lower my service size? Can I size the OCP and conductors per the 3.1kW and and use the 7.3A load for my service size calcs? The AHJ is not allowing me to call them dwelling units (I tried). Thanks for any/all help

I have a 120V 20 Amp GFCI feeding heat trace. This is for equipment not personnel so it has a 30 milliamp trip setting. Within a few seconds after turning on the breaker…it trips. When connected to a non-GFCI it’s fine and stays on. Any idea why this is happening??

Can anyone offer up some feed back on a standby generator by Generac. It’s called the: Centurion (Costco sells them) I have a customer that wants to buy her own from Costco. Personally, I haven’t had any experience with the Centurion by Generac, nor have I ever heard of Centurion. It’s a propane type generator. Just trying to get a heads up before I move forward in recommending the unit we know well= Eaton Any feedback–as far as realiablity and such will be nice. Thanks!

We have buried the dead z(t) horse or at least embalmed him. Now for something important: Let’s derive the formula for inductive reactance. Lenz’s Law states that the emf induced in an inductor by a changing current is given by, 1) e = - L*di/dt, where the minus sign indicates an opposition to a change in current. Now let, 2) i = Im*sin(wt) then, 3) di/dt = Im*[-cos(wt)*w], now substituting eqn. 3 into eqn. 1 4) e = wL*Im*[cos(wt)] Then at t = 0, 5) e = Em = wL*Im, and 6) Xl = Em/Im = wL = Vrms/Irms Inspection of eqns. 2 & 4 shows that v leads i by 90 degrees, but that angle is not carried by Xl; neither is Xl preceded by the operator “j”. It is a real number with the units of ohms. One might be tempted to take the ratio of e to i, but since these sinusoids are displaced by 90 degrees, the ratio would range between +/- infinity—useless!. Note also, that inductive reactance only has meaning when used with sinusoidal waveforms.

I just looked at a Home Inspection job and the HI noted that the 100A MB flush mount panel has 28 circuits in a 20 circuit panel. This service has an Inspection date of 2000. Aside from violating 110.3(B) what would be some issues with this current setup that I could talk with the Seller about. A panel change would not be that difficult for this setup. Not sure if the Buyer is going to require this or just looking at their options and $$$$. As always, thanks

We have some flammable storage cabinets and LP holding cages . Would bonding them to building steel that is attached to the buildings ground grid offer protection against static electricity . Maybe this is not the correct way? Is there a better way ?

Question…If multiple MC’s are ran to a wire gutter, the equipment grounds from the MC are terminated in the gutter and the “hots” and “neutrals” are ran over 20’ away in the gutter to the panels, without the grounds, thus using this gutter as a ground path for the MC, is this legal? If not, why? Thanks