Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Bolt hole spacing on 50s-70s US vintage switchgear

Status
Not open for further replies.
mb3928

mb3928

Electrical
Joined
May 27, 2020
Messages
26
Location
US
Looking to the old-timers here, we often have to replace lugs in switchgear in the Northeast US from the 50s, 60s, and 70s, and we consistently find lugs with boltholes spaced at 1-1/4". Today the NEMA standard spacings are 1-3/8" and 1-3/4".

Does anyone know why this change happened? Was there a change to NEMA standards that resulted in the spacing changing?
 
Status
Not open for further replies.

Similar threads

charz
  • Question Question
Arc Resistant Switchgear
Replies
1
Views
8K
dpc
dpc
A
  • Locked
  • Question Question
Switchgear busbars sizing
Replies
8
Views
4K
AlBerton
A
CuriousElectron
  • Question Question
MV Switchgear - Switching multiple sources
Replies
2
Views
856
dpc
dpc
P
  • Locked
  • Question Question
4160V Switchgear Ghost Trips
Replies
0
Views
1K
poseidonsampmeter
P
NickParker
  • Locked
  • Question Question
Space heater power supply for MV Switchgear
Replies
3
Views
4K
bacon4life
bacon4life

Part and Inventory Search

Sponsor

Back
Top