Question 1

No one cares if they are ul approved ... are they nec approved?

Accepted Answer

YES, They are an NFPA-70 (NEC) approved device. I have never had an inspector reject a UL device including Wagos.  However, I have had an inspector reject a non-listed device before. I used these on all my jobs, which are permitted and inspected and have never had an issue.

Question 2

How does the clamping strength compare to a crimp? Is it safe to use for a semi moving wire?

Accepted Answer

I can't speak to these connectors being used on a semi, it seems that these are really designed for use on home wiring but I could be wrong. What I can say is that, if you use these where they're going to be exposed to the elements, you better make sure they're filled with dielectric grease before inserting your wire. I, so far, haven't seen anything that says these are pre-filled as such. Also, anything carrying power should be fused as close to the power source as possible with a reliable splice connection anywhere between the fuse and battery/power source. To address a comment from someone who previously answered this question, I WOULD NEVER USE A WIRE NUT ON ANY VEHICLE OR MACHINE! I have over 20 years of experience installing, maintaining and unF***ing voice radios, data radios, telemetry, etc in light trucks, service bodies, Freightliners, Sterlings and machinery. When I see a wire nut my immediate response to the driver/operator is, "you tapped into this yourself, didn't you?" And I've never gotten "no" for an answer. And every single time, I'm working on their stuff because something isn't working. DON'T EVER USE WIRE NUTS IN AUTOMOTIVE OR MACHINERY APPLICATIONS!!!    Wire nuts are for home wiring, PERIOD!

Ok, I'm off my soapbox now...

Question 3

are they UL approved?

Accepted Answer

the "cUL" listing tells you that the product is "UL" for Canada. check with the manufacturer to see if the product is luted for use in the US.

Question 4

Which connector will allow the connection of 10 gauge stranded to 12 gauge stranded?

Accepted Answer

These connectors are rated for 20 AMPs and upto 12 Gauge wire. You can put a 12 gauge and lets say a 16 gauge into the same wago and it will lock, but you can not use 10 gauge wire which is rated for 30 amps in these connectors.

ASIN	B00JB3U7Y6
Best Sellers Rank	#801 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Electrical Connectors
Brand Name	WAGO
Color	Clear
Connector Type	IDC
Current Rating	20 A
Customer Reviews	4.8 out of 5 stars 10,754 Reviews
Gauge	12
Global Trade Identification Number	04050821808435
Included Components	All
Item Dimensions W x H	0.52"W x 0.33"H
Item Type Name	2-Conductor Compact Splicing Connectors
Item Weight	0.02 kg
Manufacturer	Wago
Material	Plastic
Material Type	Plastic
Model	221-412
Mounting Type	not specified
Number Of Contacts	2
Number Of Poles	2
Number of Items	100
Number of Positions	2
Part Number	221-412
Specification Met	UL
Temperature Range	85 °C
UPC	765643700440 790295719670 611359336322 765643700419 700761116377 765643700426 735090532444 765643700433 745751234778 765643700457 765643700402
Unit Count	100 Count
Upper Temperature Rating	85 °C
Voltage	450 volts_of_alternating_current

221-412

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