This depends upon the circuit breaker capacity. You may never load a circuit to greater than 80% of it's capacity. So you may load up to 12 Amps on a 15 Amp circuit, and, 16 Amps on a 20 Amp circuit.
The National Electrical Code requires you to calculate each receptacle at 180 VA.
If the circuit is 120 volts and 15 amps, you would have 1800 VA, divide by 180 VA per receptacle, equals 10 receptacles per circuit (minus the wattage of each luminaire or light fixture added to the circuit, before dividing by the 180 VA).
If the circuit is 120 volts and 20 amps, you would have 2400 VA, divide by 180 VA per receptacle, equals 13.333 receptacles per circuit (round down to 13 receptacles),(minus the wattage of each luminaire or light fixture added to the circuit, before dividing by the 180 VA).
You will need an electrician. Tim is probably right in that unless you are knowledgable, call an electrican. Saying that, if you are knowledgable, you must install a GFCI circuit outdoors. This can be tied into an existing circuit if that circuit has no more than 9 existing lights & plugs already connected. Use 12/2 with ground wiring.
Electricity is supplied around the house through a service distribution panel. From this panel specific circuit are wired to supply power to plugs, lights and appliances. Each circuit is protected by a breaker that is located in the distribution panel. These breakers vary in trip values to accommodate the load wattage's of different appliances that are connected to the circuit.
If you have used several strands of lights, make sure the plugs are plugged in securely. If the plugs are plugged in, check the bulbs. With some types of lights, if one bulb is burned out, left out, or loose, the entire strand will not light. If the bulbs are all working, it is probably time to buy a new strand of lights.
You may have disconnected the earth return or battery wire for the brake lights. This is only a possible solution if the brake lights do not use the frame as an earth return directly adjacent to the brake light housing. Normally the switch operated by the brake pedal or lever connects and earth to the brake circuit to light the brake lamp.
It depends on what type of Christmas lights. If they are the (now) standard 50 , 100, 150, mini-lights, they use a 3A fuse and you COULD use a MAXIMUM of about 750 lights if they are strung together from one string (end to end plugs) before blowing the fuse built into the plug of the first light set. If you plug them into separate outlets (or into an outlet-strip), then you could light about 3750 lights on a (otherwidse unused) 15 A household circuit. With the new LED type Christmas lights, it might be even more.
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