C7 500' Spool / 6" spacing / Green wire / SPT2 wire

C7 500' String Light Spools

Please note that these are genuine commercial grade spools that use the heavier SPT2 wire rated for 1200 watts (10 amps). Some less expensive spools, falsely advertised as "Commercial Grade", use the lighter SPT1 wire which is only rated for 840 watts ( 7 amps).

What's the difference? SPT2 wire can carry 42% more electrical current than SPT1 - meaning your finished strings can be 42% longer. SPT2 wire is not 42% more expensive than SPT1, so you get more bang for your buck using SPT2.

Example: 5 watt bulbs / 12" spacing
w/SPT1 wire = 168'
w/SPT2 wire = 240' (42% longer than SPT1)

Installation:

Spools must be cut up into shorter lengths. Do not exceed 1200 watts worth of bulbs per cut length. Doing so will overheat the insulation on the wire.

To determine how many incandescent bulbs you can have per cut length, take the wattage rating of the wire, and divide this by the wattage of 1 bulb.
Examples:
1200 watts (wire rating) divided by 5 watts (1 bulb) = 240 each 5 watt bulbs per cut length. 240 times 6" spacing = 120 feet. 12" spacing = 240'. 18" = 360'.
1200 watts divided by 7 watts = 170 each 7 watt bulbs. 170 times 6" spacing = 85 feet. 12" spacing = 170'. 18" = 255'.

When using LED bulbs, which are about .25 watts per bulb, you can't go thousands of feet - due to voltage drop caused by resistance in the wire itself. With long runs of wire, the further on down the wire you go, the lower the voltage is. With LEDs, a safe maximum length is about 400' +/-. At 400', the voltage will be about 4% lower, which should still be enough power.

Handy formulas:

WATTS divided by VOLTS = AMPS
Examples:
1200 watts divided by 120 volts = 10 amps
7 watts (1 bulb) divided by 120 volts = .06 amps per bulb

AMPS times VOLTS = WATTS
Examples:
10 amps times 120 volts = 1200 watts
.06 amps (1 bulb) times 120 volts = 7 watt bulb

General Description:

• C7 500' bulk string light spool
• Genuine commercial grade
• Wire & sockets only (Bulbs & plugs sold separately)
• Green or white wire
• 6", 12" or 18" socket spacing
• Requires bulbs with candelabra base (E12)
• Use with LED bulbs or incandescent bulbs
• Requires plugs made for SPT2 wire
• Indoor / Outdoor use

Electrical Specifications:

• 120 volt
• SPT2 18 awg wire rated for 10 amps / 1200 watts
• E12 candelabra sockets
• These spools must be cut into shorter lengths
• If using 5 watt bulbs, do not exceed 240 sockets per cut length
• If using 7 watt bulbs, do not exceed 170 sockets per cut length
• Do not exceed 10 amps / 1200 watts per cut length
• Use plugs made for SPT2 wire

Physical Specifications:

• 500' per spool
• 6" spacing - 1000 sockets per spool
• 12" spacing - 500 sockets per spool
• 18" spacing - 333 sockets per spool
• Sockets have heavy duty branch clips
• Sockets have weep hole for water drainage
• Indoor / outdoor use
• Can be modified (spliced, cut, shortened, teed..)

Pricing Information:

• Price is per spool
• Discounts are based upon the quantity purchased as specified above
• Mix & Match is available - You may mix & match all C7 spools, any spacing, any wire color, for quantity discounts

Packaging Information:

• 1 spool per carton