---
kind: "section"
citation: "49 C.F.R. § 234.263"
title: "49"
number: "234.263"
heading: "Relays."
url: "https://uscodex.org/cfr/49/234.263"
---

# §234.263. Relays.

- (a) Except as stated in [paragraph (b)](#b) of this section, each relay that affects the proper functioning of a crossing warning system shall be tested at least once every four years.
- (b)
  - (1) Alternating current vane type relays, direct current polar type relays, and relays with soft iron magnetic structure shall be tested at least once every two years.
  - (2) Alternating current centrifugal type relays shall be tested at least once every 12 months.
- (c) Testing of relays requiring testing on four year intervals shall be completed in accordance with the following schedule:
  - (1) Not less than 50% by the end of calendar year 1996;
  - (2) Not less than a total of 75% by the end of calendar year 1997; and
  - (3) **One hundred percent by the end of calendar year 1998.**
- (d) Testing of relays requiring testing on two year intervals shall be completed by the end of calendar year 1996.

## Notes

### Authority

Authority: 49 U.S.C. 20103, 20107, 20152, 20160, 21301, 21304, 21311, 22907 note; 28 U.S.C. 2461 note; and 49 CFR 1.89.

### Source

Source: 61 FR 31806, June 20, 1996, unless otherwise noted.