How many of the power cord y-splter can i use on a 6-outlet surge protector power strip?

That depends on how many total amps will be used. Surge protectors are usually limited to around 12 amps.

These power cables are NOT UL Listed (as of 8/11/2017). The only "Cable Matters" listed by UL are signal cables (not power) and wallplates (e.g. ethernet)

Is it safe to plug these into each other? I need 6 ports for my hue led lights

"Safe" as long as the power rating of the extra lights does not exceed the rated capacity of the wire you are plugging it into. I think you'd have a neater safer setup by plugging both of these into separate outlets in a 3-way adapter, and putting that in a single plug. But again, that single plug will still probably have a 15-amp total capacity. In the US, most rooms are fused with just a 15-amp total capacity. LED bulbs? Probably only one amp each, probably safe. You'd have to run the numbers to say for sure.

Is this for indoor and or outdoor use

While it is a well insulated, three prong (grounded) cable, "outdoor" use means nothing. If you leave the best 3-wire power cords out overnight and ordinary morning dew forms where the plugs go together, you can still get a lethal shock from touching the "safe" cable. So yes, you can use these at a barbeque for dinner, but not safe to use when there may be moisture, condensation, any long duration. There are special "outdoor" certified products with water-tight junctions and sleeves that are safe to leave out of exposed areas. Usually they are just one cable, not splitters.

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[ETL Listed] Cable Matters 2-Pack 16 AWG 4 Outlet Power Splitter, 1.5ft | 16 AWG, Outlet Saver, NEMA 5-15P to 4x NEMA 5-15R

[ETL Listed] Cable Matters 2-Pack 16 AWG 4 Outlet Power Splitter, 1.5ft | 16 AWG, Outlet Saver, NEMA 5-15P to 4x NEMA 5-15R

Product ID: 36379416

Details

Brand
Cable Matters
Color
Black
Connector Gender
Plug Format
Type B
Voltage
125 Volts

⚡Supports 13A / 125V / 1625W

🔌16 AWG heavy-duty cable

🖥️4 grounded NEMA 5-15R outlets

S$48

Duties & taxes included

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Description

🔋 Power up your space—quadruple your outlets, not your clutter!

UPS PRO READY - Ideal for structured power setups—perfect for home offices, studios, and labs.
SAFE CERTIFIED - ETL listed with grounded plugs ensures reliable, worry-free performance.
POWER QUAD EXPANSION - Transform one outlet into four—perfect for your multi-device lifestyle.
DUAL PACK CONVENIENCE - Two splitters in one set—keep one at home, one on the go, never run out of power.
HEAVY DUTY FLEXIBILITY - Thick yet flexible 16 AWG cable handles bulky plugs without the hassle.

The Cable Matters 2-Pack 16 AWG 4 Outlet Power Splitter converts a single grounded outlet into four, featuring heavy-duty 16 AWG cables that support up to 13 amps and 1625 watts. ETL listed and equipped with grounded NEMA 5-15 plugs, this 1.5-foot splitter set is perfect for safely powering multiple devices in home, office, or professional environments.

Specifications

ASIN	B01K3ADZ76
Amperage	13 Amps
Best Sellers Rank	#4,608 in Electronics ( See Top 100 in Electronics ) #54 in Audio & Video Power Cables
Brand	Cable Matters
Case Material Type	Plastic
Color	Black
Connector Gender	Male-to-Female
Customer Reviews	4.8 4.8 out of 5 stars (4,796)
Gauge	16.0
Indoor Outdoor Usage	Indoor
Input Current	13 Amps
Item Length	1.5 Feet
Item Weight	12.3 Ounces
Manufacturer	Cable Matters
Mfr Part Number	400010x2
Model Number	400010x2
Number Of Conductors	3
Number of Outlets	4
Plug Type	Type B
Power Cord Prong Count	3
Special Features	4-outlet design, heavy-duty 16 AWG gauge power cable, UPS compatibility
UL Listed	Yes
UPC	682017352985
Unit Count	3 Feet
Voltage	125 Volts
Water Resistance Level	Not Water Resistant
Wattage	1625 watts

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