ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#152503 - 05/08/05 02:32 PM Old French Knife Switch
pauluk Offline
Registered: 08/11/01
Posts: 7520
Loc: Norfolk, England
An interesting find from Alan Belson in France:
Found this double-knife switch on a vide-grenier (empty your loft) stall today. 5 1/2" x 2 1/2" porcelain base, one corner broken off. The sprung knives open with a strong snap action when the box-wood lever is pulled, by a helical spring on the drum axle.

Fuses, one missing, are on a red fibreboard plate, the fusewire is a low melting point metal - tin-alloy? Centre drum is hardwood- possibly lignum vitae?. I think this was used on dc, by the verdigris on one fuse post.

Possibly it had a wooden cover?. Weight 1lb 5 oz.

No makers marks at all, except the letters 'M' 'B' cast into the ceramic back, where incidentally all the fixing screws throught the porcelain have been potted in wax.

Tools for Electricians:

Member Spotlight
Member Since: 07/05/02
Posts: 8211
New in the Gallery:
SE cable question

2017 NEC and Related
2017 NEC
Now Available!

Shout Box

Who's Online
0 registered (), 55 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
New in the Gallery:
SE cable question
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
Newest Members
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals