Question about Electric Intermatic T171 24 HOURS 40 AMPS 125 VAC 1 SINGLE ELECTRIC TIMER SWITCH

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I want to connect a single phase 24 amp kiln under my waterproved pergola. What electrical work needs to be done and how much would it cost approxmatly?

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That kiln requires a 30 amp circuit, minimum. 24 amps x 125%= 30 amps per National Electric Code (NEC).

Without more info, I'll need to make a few assumptions. For the sake of estimating the cost I'll present the following scenario:

1...The distance from your electric panel to the pergola is approximately 100 feet.

2...The circuit will be underground. I'll assume that you will be able to hire someone to dig an 18 inch deep trench from the electric panel to the pergoda for $10 hr. While this should only take 3 or 4 hrs, depending on soil conditions, it could take all day. So I'll assume $80 for this.

3...This will be a 240 volt, 30 amp circuit (see why below).

4...Since you posted under the Intermatic T171, and since that is a 120 volt timer, that the kiln is 120 volts.

5...Unless the pergoda is fully enclosed, NEC still requires a weatherproof installation.

For starters, I don't recommend a 120 volt kiln. Most people I've known who had a kiln always seemed to want a bigger one ;-) Again, I'll do the estimate for a 240 volt, 30 amp kiln, as the price difference compared to a 120 volt circuit is about the same.

Also, I strongly recommend using 3/4 inch PVC conduit as opposed to 1/2 inch PVC or UF (direct burial) cable. 3/4 inch conduit doesn't cost much more than 1/2 conduit and will allow you to install wire up to #6. UF cable, in my opinion, is out of the question because if you ever decide that you want a larger kiln the direct buried UF cable is _not_ easily replaceable. A conduit and wire installation is about the same price as UF anyway.

Here's the breakdown (US dollars):

$ 10 - 30 amp, 2-pole circuit breaker
120 - 300 feet of #10 THWN COPPER wire (40 cents a foot)
20 - 1 bundle (100 feet) 3/4 inch PVC conduit
10 - 3/4 inch PVC elbows, fittings, straps
20 - Weatherproof box and weatherproof cover
+15 - 30 amp receptacle
+100 - 2 hrs labor @ $50 hr. (possibly 3 hrs.)
+80 - labor for trench
+140 - Intermatic T172R (weatherproof) 240 volt timer

Other considerations are that, if indeed, the circuit is 100 feet, you should consider using a #8 THWN COPPER wire to account for voltage drop (add $60, @ 60 cents a foot) Using a #10 wire at that distance may not allow the kiln to get to the desired temperature.

If you are anticipating things like lights, 120 volt receptacles, fans and such, the best way to do all that is to install a subpanel at the pergoda.

That should get you in the ball park as far as price. Of course, you can make adjustments accordingly. Remember that prices can vary greatly depending upon geographic location. Also, if you call a contractor for an estimate, _after_ they give you the price, _then_ ask how much they will knock off if you dig the trench.

A contractor price of $600 would not be unreasonable.

Hope this helps.

Posted on Jun 02, 2010

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Reversing the rotation of electric motors can be done easily with 3-phase motors. This can be easily achieved by swapping the connection of any two motor leads. But 3-phase motors are usually found and used for industrial purposes. The ones found and used in our homes, from water pumps to electric fans, are single phase capacitor-start type motors. Unlike 3-phase motors, reversing the rotation of single phase electric motors is no easy task. Swapping any two motor leads will not result in the reversal of the motor rotation. Analysis of the motor windings and connections are necessary before any modification can be done to achieve the desired result. Let's take a 3-speed single phase capacitor-start electric motor with electrical diagram shown below as an example. Make sure the motor is disconnected from the power supply before attempting to follow this tip. This tip is intended only for individuals with electrical knowledge, necessary tools, and understand the risks associated with handling electrical equipments and devices.


The first step in the process is determining the start winding which is connected to the line (AC white) and to one side of the start capacitor. To accurately determine the start winding, disconnect all motor leads from the start capacitor and the speed switch for multi-speed motors and then setting your ohmmeter to the lowest scale (R x 1), measure the resistances between the AC white line and each of the motor leads connecting to the start capacitor. The one with the least resistance is the starting winding lead.

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1 Answer

Single phase or 3 phase

Hmmm. Good question. Like anything, it varies depending on how the equipment is going to be used and in what environment. We could really get into the weeds, but let's just ask the couple of key questions.

1. Is this a commercial or residential environment?
2. What's the horsepower of the motor(s) in use?
3. What's the availability of 3 phase power?

1. If your saw is in daily, commercial use, then 3 phase may offer some distinct advantages: While it's expensive to convert (assuming you don't already have 3 phase available) it allows for smaller, less expensive wiring, and lower voltages making it safer and less expensive to run.

Single phase, otoh, is much more available, and runs motors up to 5hp with little difficulty. It does actually cost more to run a lot of single phase equipment so if cost is an issue and you have quite a few motors, this may be a large determining factor.

2. As I mentioned, if you're only running one or a couple smaller motors, up to 5hp, single phase should work just fine. I have several pieces of machinery with 5 hp motors them on single phase 220 and they perform great. I don't recommend 110vAC for motors under significant load. They run too hot and are not all that efficient, as well as under-powered.

3. Installing a 3 phase electrical system can be very expensive. I would look into this carefully, get a few estimates before moving ahead. You'll need to find out if it's even available, cost of transformers for 110 in the building as well as whether they'll charge you commercial rates for your electricity once it's installed.

There is no simple answer for this question, I fear. There are simply too many factors to consider.

This is the short answer. A simple web inquiry will give you more answers than you actually need.

Good luck.

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Wiring diagram for three phase power with two 200 amp service boxes inside building

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