350 MCM Wire Buyers in Pennsylvania

350 MCM holds 350,000 circular mils, about 0.275 square inches, and it is the size that appears when a 400 A service or a large mechanical feeder is designed. It is common in risers, motor control center feeds and the paralleled sets that carry 800 A or more, where three 350 MCM conductors per phase is a familiar arrangement. At that ampacity the conductor is stiff, so installation planning matters as much as the cable itself, particularly in tight switchgear rooms.

Pennsylvania plants and contractors handle it constantly, because 480 V distribution at any real scale uses conductors in this range. A project that installs 900 feet of 350 MCM in a tray will buy 1,000 feet, and the leftover 100 feet is exactly the kind of partial reel that sits in a yard for years. Those partials are worth quoting rather than scrapping, since a contractor with a short run can use 200 feet as readily as 2,000.

Circular mils	350,000, or 350 kcmil, about 0.275 square inches of area
Stranding	37 wires in standard concentric strand, with compact and compressed versions available
Ampacity framework	NEC Table 310.16 lists 350 A for copper at 75 degrees C and 250 A for aluminum
Insulation	XHHW-2, THHN, tray cable, and 350 MCM in medium voltage constructions
Typical uses	400 A services, risers, MCC feeders, paralleled sets and large mechanical loads

The 350 MCM size in the feeder ladder

The large sizes step in 50 or 100 MCM increments because that is how the ampacity table moves. Copper goes 255 A at 250 MCM, 350 A at 350 MCM and 380 A at 500 MCM, so a designer choosing 350 MCM is usually aiming at a 400 A frame size with some margin for derating.

Aluminum at 350 MCM is listed at 250 A, which is why aluminum feeders often skip a size. A job that needs 300 A in aluminum may go to 500 MCM rather than 350, and the 350 aluminum reel that was bought for the first design becomes surplus.

• Copper 350 MCM is listed at 350 A at 75 degrees C
• Aluminum 350 MCM is listed at 250 A
• Common in paralleled sets of two, three or four
• Compact strand is common in aluminum

Where 350 MCM is used

Motor control centers, large chillers, cooling towers and process lines account for most of it. Risers in multifamily and commercial buildings use 350 MCM where the service is large and the run is vertical. Paralleled service conductors often use two or three 350 MCM per phase instead of a single 1000 MCM, because smaller conductors are easier to bend and terminate.

Utility and industrial substation work adds another stream, including 350 MCM copper in grounding grids and switchyard connections. Those bare conductors are usually sold on metal value, though clean, straight lengths sometimes suit a contractor who needs a short run.

• MCC and chiller feeders at 480 V
• Vertical risers in larger buildings
• Paralleled service and feeder sets
• Bare 350 MCM in grounding grids

Footage, stranding and value

At 350 MCM the metal is heavy enough that a 100 foot remnant has real value, which is not true of small wire. That makes partial reels worth quoting rather than scrapping. A reel with 300 feet of copper 350 MCM is a usable feeder for a contractor who needs a short run, and it is priced between scrap and new.

Insulation type matters for placement. XHHW-2 is the default for wet and outdoor locations, THHN for dry raceway work, and tray cable for open runs. Copper against aluminum remains the biggest single factor in the number, and mixing the two in one description usually produces a lower offer than splitting them.

• Partial reels worth quoting at this size
• XHHW-2 for wet locations, THHN for dry
• Tray cable valued as an assembly
• Copper and aluminum described separately

Condition and storage

Bending radius is the practical issue. A 350 MCM conductor is stiff, and cable that was forced around a tight corner during removal carries a permanent bend. In tray and switchgear work that bend has to be cut out, so a buyer will ask how the cable was handled and how much end is damaged.

Outdoor storage takes its usual toll. Water in the bottom wraps, chalked jackets and rusted reels are common, and a reel left on gravel will have abrasion along one flange. None of that is fatal, but it is priced, and a photograph of the damaged area is more useful than a description.

• Permanent bends from tight pulls
• Water and corrosion in lower wraps
• Abrasion from reels stored on gravel
• Rusted or rotten reels that no longer support the coil

What to photograph

Begin with the reel tag and the print, then both conductor ends, then a side view of the full reel. Add a close photograph of any bend or jacket damage, and note the approximate footage and the reel size. If the cable is tray rated, show the marking that confirms it.

Send the project records if they exist, particularly the submittal and the purchase invoice. For large lots, a short list of reels with size, insulation and footage is the most efficient way to get a quote, and it lets us tell you which reels are worth moving first.

• Tag, print and both ends
• Close shot of bends and jacket damage
• Tray rating marking if present
• A reel list with size, insulation and footage

What we buy in this category

• 350 MCM copper XHHW-2 and THHN reels
• 350 MCM aluminum feeder cable
• 350 MCM tray cable and TC-ER
• Bare 350 MCM for grounding
• Partial reels from plant projects
• Paralleled feeder sets with matched lengths
• Riser cable from commercial buildings
• Cable with submittals and test records

Selling 350 mcm wire in Pennsylvania

From the Route 202 corridor to the Mon Valley and the I-81 warehouse belt, 350 mcm wire is stored in shops and yards all over the state. Send the city or township, the access details and the photographs, and the pickup can be planned against the real site.

• Philadelphia
• Norristown
• King of Prussia
• Pottstown
• Lansdale
• Abington
• Cheltenham
• Lower Merion