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TECHNICAL RESOURCES

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Electrical & Mechanical Formulas
NEMA Motor Frame Dimensions
Three Phase Motor Connections (motorconnections.pdf file)
Full Load Currents (motorfla.pdf file)
Conversion Factors (conversionfactors.pdf file)

ENERGY EFFICIENT MOTORS

Annual Savings

based on $.05 per kilowatt hour, 7200 hours operation per year.

Calculating Yearly Energy Savings
Savings= (Hours Operation/Year) x (Power Cost) x (Kilowatts Saved)

Kilowatts Saved = HP x .746 x [ 1 1 ]

Std. Eff. XE Eff.

EXAMPLE: 25 HP, 1800 RPM, TEFC,
XE vs. Std. Eff. Price Premium @ User

Payback =	(XE Net $1,396) - (Std. Eff. Net $1,061)
Payback =	(7,200 Hrs/Year) x ($.05 / Kwh) x (1.6289 Kw)

0.57 Years =	$335
0.57 Years =	$586

See Table Below

Horse- Power	RPM	XE Guar. Min. Efficiency	Std. Motor Min. Efficiency	Kilowatts Saved	Energy Savings Per Year
1	1800	82.50%	74.00%	0.1039	$37.39
1.5	1800	84.00%	75.50%	0.1500	$53.99
2	1800	85.50%	78.50%	0.1556	$58.02
3	1800	87.50%	75.50%	0.4065	$146.35
5	1800	87.50%	80.00%	0.3996	$143.87
7.5	1800	89.50%	81.50%	0.6136	$220.91
10	1800	89.50%	82.50%	0.7072	$254.60
15	1800	91.00%	82.50%	1.2669	$456.10
20	1800	91.70%	84.00%	1.4915	$536.92
25	1800	92.40%	85.50%	1.6289	$586.40
30	1800	92.40%	86.50%	1.6521	$594.74
40	1800	93.00%	86.50%	2.4111	$867.99
50	1800	93.00%	88.50%	2.0394	$734.17
60	1800	94.10%	88.50%	3.0099	$1,083.55
75	1800	94.50%	88.50%	4.0140	$1,445.04
100	1800	95.00%	88.50%	5.7675	$2,076.29
125	1800	95.40%	88.50%	7.6209	$2,743.52
150	1800	95.80%	90.20%	7.2518	$2.610.65
200	1800	95.80%	91.70%	8.9633	$2,506.80
250	1800	96.20%	93.00%	5.8612	$2,110.04
300	1800	96.20%	93.00%	8.0048	$2,881.74