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Supply Cable

April 26th, 2005

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How does an electrician size up what supply cable to connect on a new machine installation?

Sizing feeders or branch circuit conductors is not a simple calculation. When a new piece of equipment is selected for installation, a number of factors must be considered. Here are the most important items to be addressed when calculating your conductors:

1) Is the equipment specifically classified as a continuous load? Some equipment is directly labeled as continuous duty by the National Electrical Code. This means that it will stay in operation, or can be anticipated to, for periods of 3 hours or longer. An example is a typical water heater. Article 422.13 classifies them as a continuous load. (NEC). Continuous loads must be calculated and rated at 125% of their stated ampacity minimums.

2) Is the installation classified as a dry, damp, or wet location? Maximum ampacity levels are impacted in different environmental locations. Wet locations typically cause a significant de-rating of your conductors. Examples of wet locations are, but are not limited to, any underground (buried) conduits, in concrete slabs, or where outdoors and exposed to direct weather.

3) Ambient temperature considerations. Ambient temperature is the temperature of the air that surrounds the equipment. These temperature differences cause direct de-ratings of the ampacity of conductors. Article 310.15 and Table 310.16 help us select amperages for given wire sizes, and contain multipliers for ambient temperatures that are above 86 degrees F. Non-air conditioned factory or manufacturing facilities, especially in the South, can, in extreme circumstances, restrict normal wire ampacities by as much as TWO THIRDS or more of their standard ratings.

4) The number of current carrying conductors (hots and sometime neutrals can count), all in the same conduit, also restrict wire ampacity. See Article 310.15(B)(2)(a).

5) Specific code sections for your particular piece of equipment may increase or decrease your allowable ampacities.

6) Voltage drop considerations/calculations can significantly increase a wire size.

7) Copper heat losses vs the economical costs of larger wire sizes can also be considered. Larger amperage loads shed heat due to wire resistance. The smaller the wire, the larger the loses are. Overtime, your utility costs can be significantly more expensive due to these losses than what a single larger wire size would initially cost.

As you can see, it's really not just a simple answer. If you are looking for some examples, see our web site, or email us for questions. If you have a specific question about a particular piece of equipment, email the specifics to us and I will calculate what I think your conductor size should be. For more information, see my blogs under "Considerations for Branch Circuit Wire Sizing."

-Mitch Tolbert
www.ElectricianTesting.com

Find Supply Cable On eBay Below:

AC Adapter 65W for Toshiba Satellite PA3714U 1ACA OEM POWER SUPPLY Cord +Cable
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1pc 3FT 1M I SHENG IS 034 3 Prong Power Supply Cord Cable 7A 125V for Laptop
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10pcs 33FT 1M I SHENG IS 034 3 Prong Power Supply Cord Cable 7A 125V for Laptop
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1Pc Black USB Male To Female Extension Cable Extender Adapter Acc Supply 15M
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5pcs 33Ft 1M I SHENG IS 034 3 Prong Power Supply Cord Cable 7A 125V for Laptop
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Genuine 20V 45A 90W AC Adapter For Lenovo ThinkPad Laptop Charger Power Supply
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3FT RIGHT 90 DEGREE POWER SUPPLY CABLE FOR MICROSOFT XBOX ONE 1 ADAPTER CHARGER
3FT RIGHT 90 DEGREE POWER SUPPLY CABLE FOR MICROSOFT XBOX ONE 1 ADAPTER CHARGER
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3 FT RIGHT ANGLE AC POWER SUPPLY CORD CABLE PLUG FOR MICROSOFT XBOX 360 ADAPTER
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3FT RIGHT ANGLE COMPUTER POWER SUPPLY AC CORD WIRE FOR HP DELL ACER DESKTOP PC
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65W AC Adapter Battery Charger for Toshiba G71C000AR310 Power Supply Cord Cable
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AC Adapter Battery Charger For Toshiba L75D A7280 Laptop Power Supply Cord Cable
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AC Adapter Charger for Asus K52JB K40IJ K40IN Z9 Z9000 Power Supply Cord Cable
AC Adapter Charger for Asus K52JB K40IJ K40IN Z9 Z9000 Power Supply Cord Cable
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AC Adapter Charger For Toshiba Satellite C855D S5103 Laptop Power Supply Cable
AC Adapter Charger For Toshiba Satellite C855D S5103 Laptop Power Supply Cable
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33W AC Wall Power Supply DC Charger Adapter Cable for Asus Eeebook X205T X205TA
33W AC Wall Power Supply DC Charger Adapter Cable for Asus Eeebook X205T X205TA
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12 Inch 24 Pin to 8 Pin 18AWG ATX Power Supply Adapter Cable for Dell Computers
12 Inch 24 Pin to 8 Pin 18AWG ATX Power Supply Adapter Cable for Dell Computers
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1 to 8 4Pin SATA Molex Cooler Fan Hub Splitter Cable PWM Power Supply Adapter
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Zebra Z4M Z4S Power Supply PCB Board Logic Board 77711 000 CABLE 77715P CABLE
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90W Universal AC Adapter + Power Cable for Multi Brands Dell HP Supply
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Smart Pin Power Supply Cord + Plug Cable For HP Compaq 90W AC Adapter 608428 001
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5 pcs 2 SATA Y Power Cable POWER CABLE Adapter Power Supply Connector IDE4PW7O2
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Genuine OEM HP 65w AC Adapter Charger Cord Power Supply R33030 Power Cable
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Laptop 25 HDD SSD Hard Drive 15+7 Pin SATA TO eSATA + USB Power Supply cable
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15m USB 20 A Male Plug To DC 38 x 14mm Female Charger DC Power Supply Cable
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DPS 1200FB 1200W POWER SUPPLY w Breakout Adapter 10 Cables For Ethereum Mining
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NEORTX 24 Pin to 14 PSU Main Power Supply ATX Adapter Cable for Lenovo IBM
NEORTX 24 Pin to 14 PSU Main Power Supply ATX Adapter Cable for Lenovo IBM
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Power supply AC Adapter Charger for Dell 5470D 1628 5460D 2528S A065R064L DL01
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15 And 20CM Pc Power Supply Connector Internal Cable Power Splitters 8 Or 6 Pin
15 And 20CM Pc Power Supply Connector Internal Cable Power Splitters 8 Or 6 Pin
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Universal Mains Power Supply 3V 12V Adjustable AC DC 30W Adapter Cable
Universal Mains Power Supply 3V 12V Adjustable AC DC 30W Adapter Cable
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