[TR] How to identify fuse value from a color

[James Childs]

 Found this on the web (Wikipedia).  Don't know if it is accurate or not but it is a Lucas chart so who knows!

Lucas type[edit]

Lucas type fuses are used in old British-made or assembled automobiles. The physical length of the Lucas ceramic type of fuse is either 1 inch or 1.25 inch, with conical ends. Lucas Glass tube fuses have straight ends. Lucas type fuses usually use the same color-coding for the rated current. Lucas fuses have three ratings; the continuous current they are designed to carry, the instantaneous current at which they will fuse, and the continuous current at which they will also fuse. The figure found on Lucas fuses is the continuous fusing current which is twice the continuous ampere rating that the system should be using; this can be a source of confusion when replacing Lucas fuses with non Lucas fuses. The Lucas 1/4" diameter glass tube fuse have a different length as compared to the standard US item. The Lucas 1/4" diameter glass tube fuse is 1 and 5/32" [≈29.4 mm] long, while the US standard 1/4" glass tube fuse is 1 and 1/4" [≈32.0 mm] long. However many Lucas fuse holders permit the longer U.S. version to be installed easily.

Color coding[edit]

| Color | Continuous ampere (=rated current) | Instantaneous fusing ampere | Continuous fusing ampere |
| Blue | 1.5 | 3.5 | 3 |
| Yellow | 2.25 | 5 | 4.5 |
| Red on Yellow | 2.5 | 6 | 5 |
| Green | 3 | 7 | 6 |
| Nut Brown | 4 | 10 | 8 |
| Red on Green | 5 | 12 | 10 |
| Green on Black | 5 | 12 | 10 |
| Red on Brown | 6 | 14 | 12 |
| Light Brown | 7.5 | 18 | 15 |
| Pink | 12.5 | 30 | 25 |
| White | 17.5 | 40 | 35 |
| Purple on Yellow | 25 | 60 | 50 |
| Yellow on Red | 30 | 75 | 60 |



Tony Childs1973 Triumph Stag1972 Triumph Spitfire MKIV

    On Thursday, April 30, 2020, 02:06:08 PM EDT, Sujit Roy <triumphstag at gmail.com> wrote:  
 
 There is what looks like a green paint mark on it. I'm aware British cars need British fuses. Mainly trying to find out for curiosity

On Wed, Apr 29, 2020 at 9:40 PM TeriAnn J. Wakeman <tjwakeman at gmail.com> wrote:

  On 4/29/20 9:32 PM, Brian Kemp wrote:
  
  Could the color be oxidation of some sort.  Copper will go green.  The proper fuses are inexpensive.  I'd just get some new ones.  Get them from a British parts supplier as they are rated to a different standard than American ones.  
 
And I just happen t have an equivalency table in my TR web site
 
http://www.tr3a.info/fuses.htm
 
TeriAnn
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Sujit Roy
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https://triumphstagblog.wordpress.com/

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