Any issues with radio interferance from these balasts?

I'm not sure what you mean by radio interference but once the lights are on they don't flicker ever and stay on. We have our home Wifi above it in our second story and devices connected under the lights in the garage have no issues or signal interference due to the ballast. These seem to be pretty standard equipment for 20+ years in overhead lighting

Is this the same ballast as icn-4p32-sc ? what is the sc for?

I replaced a REL-4p32-SC with this ballast and it worked fine.

Does this replace reb 4p32 sc? The model number listed at the top of the description is different.

Yes. Exactly. D.J. Sexton Sexton Lighting Design.

This is an instant start ballast. How is it installed? I have been told that 1) I could use shunted sockets; or 2) I could put shunt wires across a fo

Yes, I have same question. They aren't answering with regards to the sockets. I think what you said is right, you need shunted dockets which have only one hole to connect the wire to or you need to simulate that by using a short wire to connect both holes in an unshunted socket/tombstone. Otherwise you aren't delivering power to both pins on the bulb. I guess it depends on the bulb too. The Hyperikon led bulbs are shunted internally so it doesn't matter which type of tombstone you use. Not sure about other bulbs. I was looking at the Philips instant fit led bulbs and Philips site says to use shunted sockets.I ended up buying the shunted dockets and it worked perfectly. Just needed 2 short pieces of wire to connect one socket to another since there are just 2 yellow wires for that end. Just like the diagram on the ballast. Used the Phillips instant fit led bulbs. So much simpler than the 2 old double Bulb ballasts. Wires were long enough for the 48" fixture.

ASIN	B000BQWWAE
Accepted voltage frequency	100 to 240 Volts and 60 Hertz
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#45,101 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #10 in Electrical Ballasts
Brand	Philips
Brightness	2150 lumens
Bulb Base	G13
Bulb Shape Size	T8
Color	Black
Color Rendering Index	80
Control Method	App
Customer Reviews	4.6 4.6 out of 5 stars (962)
Date First Available	June 30, 2006
Efficiency	High
Finish	Black
Global Trade Identification Number	00781087091517, 00781087106396
Incandescent Equivalent Wattage	130 Watts
Included Components	Tool Cabinet
Indoor/Outdoor Usage	Outdoor
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	12.2 ounces
Item model number	ICN4P32N
Light Color	Bright White
Light Source Type	Fluorescent
Light Source Wattage	32 Watts
Light Type	Fluorescent
Manufacturer	PHILIPS LIGHTING
Material	Metal
Measurement System	Metric
Model Name	ICN-4P32-N
National Stock Number	6250-01-361-6018
Number Of Pieces	1
Number of Items	1
Part Number	ICN4P32N
Power Consumption	32 Watts
Power Source	Corded Electric
Product Dimensions	1.9"W x 1.2"H
Shape	Rectangle
Size	1 Count (Pack of 1)
Special Feature	Shock and vibration resistant
Special Features	Shock and vibration resistant
Specific Uses For Product	Indoor
Specification Met	Possibly meets various international electrical standards for voltage and frequency
Style	Classic
UPC	781087106396 781087091517 781087045640
Unit Count	1.0 Count
Voltage	120 Volts
Warranty Description	-.
Wattage	32 watts
White Brightness	100 Lumens

PHILIPS LIGHTING ICN4P32N 3/4F17-F32 Elec Ballast , Black

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