WMYCONGCONG 660V 30A Single Phase 2 Inlet 8 Outlet Metering Box Junction Power Distribution Terminal Block

Why I reached for this terminal block

I needed a compact, tidy way to split a single-phase feed into multiple branch runs without resorting to a mess of wirenuts or improvised busbars. The WMYCONGCONG 2‑in/8‑out terminal block looked purpose-built for the job: two main feeds in, eight take‑offs out, a 30 A current rating, and a 660 V insulation rating packed into a polycarbonate body that fits in tight enclosures. After a few projects—one AC service rework inside a metering enclosure and a low‑voltage DC distribution task—this block has earned a spot in my kit, with a couple of caveats worth noting.

Design and build

The footprint is small (roughly 99 × 45 × 33 mm), so it tucks cleanly into meter cans, junction boxes, and project enclosures. Two 5 mm mounting holes make it easy to secure with M5 or #10 hardware; I preferred pan‑head screws with washers for better load distribution on the polycarbonate base.

The block is a simple, honest design: metal bus bars inside a molded housing with set‑screw clamps. There’s no DIN‑rail shoe, no extras, no fuses—just a distribution point. The polycarbonate feels robust for the size and resists the hairline cracking I’ve seen in cheaper plastics when you torque clamps or bump the edges. The bright color also makes it easy to spot inside a crowded panel.

Fit and finish are good for the price point. The clamp screws turn cleanly with a firm, repeatable bite and no gritty feel. Threads are decent, and there’s enough clearance to guide conductors in straight without snagging insulation.

Installation experience

I trialed the block in two scenarios:

1) Single‑phase AC distribution inside a metering compartment, separating meter conductors from downstream house service conductors to avoid any parallel paths. The two main inputs fed through to multiple branch runs for equipment and subpanel feeds. The compact size really helped; it left room for proper bend radii and labeling.

2) A 12 V DC camper power system where I wanted a neat fan‑out from a battery bus to lighting, pump, and accessory circuits. Here, the ability to bring two heavier supply conductors in and cleanly land multiple branches was a big win for serviceability.

In both cases, the block mounted quickly. I recommend:

• Pre‑planning conductor entry so bends are supported and clamps are accessed without crossing wires.
• Using ferrules on fine‑strand conductors to improve grip and reduce cold flow.
• Labeling each branch with a clear wrap or heat‑shrink marker; there’s no built‑in marker strip.

One installation quirk: 12 AWG solid copper can be finicky. The clamp screws are somewhat short, and with 12 AWG solid I could reach full screw travel without achieving the clamping force I wanted on some positions. With 10 AWG solid or 12 AWG stranded (with ferrules), the hold was secure. If your design mandates 12 AWG solid, consider ferrules sized for solid conductors or step to a short stranded pigtail via an approved connector to land in the block. Don’t double‑up conductors under one clamp to “make it thicker”; that’s poor practice.

Electrical performance

The block is calibrated to 30 A with a 660 V insulation rating (50/60 Hz). That makes it versatile: suitable for low‑voltage DC, 120/240 V single‑phase branching within its current limits, and various control and lighting circuits. I ran a 12 V DC load that peaked around 20 A continuous for a half hour; the block stayed stable and only slightly warm to the touch, with no signs of looseness or creep after cooling.

A few practical notes:

• This is a distribution point, not overcurrent protection. Protect the block and each branch with appropriately sized fuses or breakers upstream.
• Treat 30 A as a per‑path rating and size conductors to match both code and your application’s thermal realities.
• Check your local code and inspection requirements. I couldn’t find a formal listing mark on mine; for critical service or utility‑meter compartments, your AHJ may require a listed component.

Wire compatibility and handling

Here’s what worked well for me:

• 10 AWG solid and stranded: Strong clamp, no movement after torque.
• 12 AWG stranded with ferrules: Excellent, especially for vibration‑prone environments (vehicles, workshops).
• 14 AWG stranded: Good mechanical hold, but be mindful of load; don’t approach the block’s 30 A limit with small conductors.

And what was less ideal:

• 12 AWG solid: The clamp screws can bottom before fully biting in some positions. It’s workable with ferrules, but not my first choice if you’re locked into solid conductors.

General tips:

• Strip length matters; too long and you risk exposed copper, too short and the clamp may bite insulation. I found 9–10 mm worked well.
• Re‑torque checks: After the first thermal cycle under load, recheck clamp tightness as part of your commissioning routine.
• Avoid tinning wire ends; use ferrules instead to prevent creep.

Where it shines

• Metering and service separation: The two inlets and multiple outlets make it clean to segregate meter leads from house feeders and avoid parallel conductor paths.
• Low‑voltage distribution: Solar, RVs, LED lighting, and general 12/24 V projects benefit from the neat fan‑out and easy access.
• Compact panels: The small footprint and straightforward mounting simplify crowded layouts.
• Quick retrofits: When you need to clean up a junction box or re‑land multiple runs, this is faster and tidier than ad‑hoc wirenut trees.

What could be better

• Clamp screw travel: A touch more length would improve performance with mid‑range solid wire (notably 12 AWG).
• Marking and labeling provisions: A simple clip‑on ID strip or molded recess for labels would reduce clutter.
• Compliance documentation: Clear listing/approval information would make it easier to spec in inspected installations.

None of these are deal‑breakers for light industrial, residential branch distribution, or low‑voltage work, but they’re worth noting if you’re building to strict spec.

Safety and code notes

• Only use within rated current and voltage.
• Enclose appropriately; the block itself isn’t an enclosure.
• Maintain clearances and conductor bend radii; don’t crowd the clamps.
• Protect each branch circuit with the correct overcurrent device.
• If in doubt about suitability for a metering enclosure or service equipment, consult your AHJ or a licensed electrician.

Alternatives to consider

If you’re working exclusively with smaller solid conductors (12–14 AWG) and want foolproof clamping, look at spring‑clamp or cage‑clamp style distribution blocks—they’re more forgiving with solid wire but usually bulkier. For applications requiring listed components with documented torque specs and UL markings, vendor‑specific service‑rated distribution blocks are safer bets, though you’ll pay more and lose some compactness.

The bottom line

The WMYCONGCONG 2‑in/8‑out terminal block hits a sweet spot of compact size, respectable ratings, and simple practicality. It cleans up wiring, speeds up installs, and keeps future maintenance straightforward. It’s not a miracle part, and it won’t replace a proper breaker panel or fused distribution block, but as a general‑purpose junction and fan‑out device, it’s consistently useful.

Recommendation: I recommend this terminal block for compact AC single‑phase distribution and low‑voltage projects where you want a clean, serviceable fan‑out from two mains to multiple branches. It’s well‑built for the price, handles 10 AWG and ferruled stranded conductors confidently, and keeps panels organized. If your application relies heavily on 12 AWG solid wire or requires a formally listed component for inspected service equipment, you may want to choose a spring‑clamp or listed alternative. For everyone else, this is a reliable, tidy solution that earns its keep.