NR/L3/SIG/11303/2F10
Signalling Installation Signal Boxes: Lever Locks and Contacts
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| Organization: | NR |
| Publication Date: | 4 September 2010 |
| Status: | active |
| Page Count: | 12 |
scope:
Introduction
Signal box and ground frame levers are provided with mechanical locking between levers in the same frame, but they frequently need to be interlocked with electrical controls or other systems. To allow this, a lever is fitted with an electric lock and a set of electrical contacts.
The electric lock allows the lever to be moved from particular positions only when the lock is energised, and the electrical contacts can be chosen so that they only make when the lever is in certain positions.
Document History
NR/L3/SIG/11303/2F10
September 4, 2010
Signalling Installation Signal Boxes: Lever Locks and Contacts
Introduction
Signal box and ground frame levers are provided with mechanical locking between levers in the same frame, but they frequently need to be interlocked with electrical controls or other...
References
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