Skip to main content

GFCI

A lot of old houses have fuses and regular two prong outlets. GFCI sockets are a boon to a no fuss DIY rewiring of the house to make it much safer. A nice description of GFCI sockets is given here (In general stackexchange is awesome and I would recommend joining). A nice description, with pictures, of how to rewire a GFCI socket is given here.
The GFCI protects against ground faults. This means that if there is some problem with the equipment you plug in and any part of the wiring becomes, effectively, exposed, you are protected against getting a shock from that. However, nothing can protect against a deliberate touching of the live and neutral lines.
GFCIs are cool because you can use them for two prong outlets (with no ground). You still need three prong outlets for surge suppression - the surge suppressor redirects the surge to ground (which is basically a fat, extremely low resistance line, allowing the surge to flow past the equipment and into the ground beneath the house).
The typical recommendation is to have GFCIs for any outlets with any water nearby - kitchens, bathrooms, basements and the outdoors. They are more expensive than regular outlets, but there is no harm in replacing all outlets with GFCIs.
Note: Equipment you will need when replacing outlets
  1. Electrical tape
  2. Non-contact tester
  3. Electrical tester
  4. Insulated screwdriver
  5. Outlet tester

Comments

Popular posts from this blog

Flowing text in inkscape (Poster making)

You can flow text into arbitrary shapes in inkscape. (From a hint here).

You simply create a text box, type your text into it, create a frame with some drawing tool, select both the text box and the frame (click and shift) and then go to text->flow into frame.

UPDATE:

The omnipresent anonymous asked:
Trying to enter sentence so that text forms the number three...any ideas?
The solution:
Type '3' using the text toolConvert to path using object->pathSize as necessaryRemove fillUngroupType in actual text in new text boxSelect the text and the '3' pathFlow the text

Drawing circles using matplotlib

Use the pylab.Circle command

import pylab #Imports matplotlib and a host of other useful modules cir1 = pylab.Circle((0,0), radius=0.75, fc='y') #Creates a patch that looks like a circle (fc= face color) cir2 = pylab.Circle((.5,.5), radius=0.25, alpha =.2, fc='b') #Repeat (alpha=.2 means make it very translucent) ax = pylab.axes(aspect=1) #Creates empty axes (aspect=1 means scale things so that circles look like circles) ax.add_patch(cir1) #Grab the current axes, add the patch to it ax.add_patch(cir2) #Repeat pylab.show()

Running a task in a separate thread in a Tkinter app.

Use Queues to communicate between main thread and sub-threadUse wm_protocol/protocol to handle quit eventUse Event to pass a message to sub-threadimport Tkinter as tki, threading, Queue, time def thread(q, stop_event): """q is a Queue object, stop_event is an Event. stop_event from http://stackoverflow.com/questions/6524459/stopping-a-thread-python """ while(not stop_event.is_set()): if q.empty(): q.put(time.strftime('%H:%M:%S')) class App(object): def __init__(self): self.root = tki.Tk() self.win = tki.Text(self.root, undo=True, width=10, height=1) self.win.pack(side='left') self.queue = Queue.Queue(maxsize=1) self.poll_thread_stop_event = threading.Event() self.poll_thread = threading.Thread(target=thread, name='Thread', args=(self.queue,self.poll_thread_stop_event)) self.poll_thread.start() self.poll_interval = 250 self.poll() self.root.wm_protocol("WM_DELETE…