![]() Hence you should know both thicknesses in order to determine the hole diameter. BS 328 drill dimensions are defined as below. Normally, wires have conductive cable and insulation thickness. There are many standards used to define the drill dimensions, one of the most commonly used drill bit sizes is the British Standard BS 328 set including twist drill sizes between 0.2 mm and 25mm. Decimal Equivalent (Inches) Flute Length (Inches) Overall Length (Inches) 1/64. See the chart below for these specifications. Always drilled holes should be equal to or larger than the wire size. Jobber length drill bits' flute length and overall length are dependant on the diamater of the drill bit. When you drill for screws, this guide will help you to find the drill bit sizes for screws.ĭrill bit size is very important for wirings. You can use below drill bits when you drill a hole for 3 conductor wires. 3 conductor wires have different size gauges. BS 328 drill sizes are defined as shown in the drill size chart below: Please note that BS 328 sizing only applies to twist drill bits. Wire Gaugeĭrill bit sizes for 2 conductor wires Drill Bit Size for 3 Conductor Wiresģ conductor wires and 3 core cables are the same in name and have 3 conductive cables inside the single wire. There are a variety of standards used to define drill sizes, the most common one in the UK is the British Standard BS 328 set which includes twist drill bit sizes between 0.2 mm and 25 mm. It helps to find any drill bit related to the mm or inches easily. Fractional sizes are measured in inches, while metric sizes are measured in millimeters. The decimal equivalents of the diameters are shown in both English and Metric units. I have prepared a guide to find drill bit sizes in inches and mm. The drill size chart provides a list of standard size drill bits in several measurement systems, including fractional, metric, wire gauge number, and letter. When you drill a hole for 2 conductor wires you can select drill bit sizes from below table. Wire gaugeĭrill Bit Sizes for Single Wires Drill Bit Size for 2 Conductor WiresĢ conductor wires, double wires, and 2 core cable wires are the same wires that have 2 wires in a single cable.īoth cables are coated with electrical insulations. So let’s see what are the suitable drill bit sizes for each wire size. When you choose a drill bit for a wire, it should be more or equal to the diameter of the wire (including insulation and conductor). Standard wire sizes and insulation thickness for Poly(Vinyl Chloride) Insulations Drill Bit Sizes For Single Conductor Wires As a result of this, the wire diameter will be increased due to this layer. According to the voltage and current, the layer’s thickness varies. These standard wires are insulated with Poly (Vinyl Chloride) in order to prevent the current leaking. These sizes are measured in millimeters and range from 0.2 mm to 25 mm, increasing in 0.1 mm increments. Metric drill bit sizes : One would use metric drill bit sizes in countries that follow the metric system. The drill bit size should be equal or more than the wire size The sizes range from 1/16 inch to 1 inch, increasing in 1/64-inch increments.
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