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An installer will torque this down on a 95mm² conductor running to a substation grid, and it have to hold that connection through freeze-thaw cycles and occasional fault currents without loosening — that's what the certification is really testing for.
We've seen these clamps pull 500+ amp surges in lab simulations across -40°C to 100°C, and the contact resistance stayed within 0.5 milliohm variance batch to batch, which is tighter than what most generic U-clamps can manage.
Every batch gets a third-party retest under IEC61238-1 before shippng, so you're not gambling on whether zinc content in the brass actually meets the NFC33-090-1 spec (usually 2-4 weeks lead time for a full retest if you want your own lab to verify).
The tape size options are 25x3mm in either aluminum or copper, but what it really does is match whatever your local code calls for — most buyers here go with copper for direct burial because alumnum can corrosion-couple with the brass.
It's not suitable to overhead line spans or loads; this is strictly a stationary grounding clamp for earthing rods and flat tape conductors in the 50-120mm² range.
Also, teh U-bolt threads are rolled, not cut, so there's less chance of stripping under high torque — a detail you notice when you've had to replace clamps that failed at the threads in a lightning event.
Our MOQ is typically 500 pieces for the UC clamp, but if you need a smaller trial order, we can sometimes flex to 100–200 pieces depending on stock.
Yes, we can provide the IEC61238-1 and NFC33-090-1 certification copies along with the ISO9001 docs. Just let us know if you need them before shipping.
The standard UC clamp is fixed for 50–120mm² conductors, but we can make a modified version for a different size range if you order at least 2000 pieces.
You get to pick between 25x3mm aluminum or 25x3mm copper tape when ordering. Just specify which one you need, and we'll match it.
Store them in a dry, ventilated area away from moisture and corrosive chemicals. Our clamps handle -40°C to 100°C, but long-term dampness could tarnish the brass or copper.
