Somebody mentioned JAR OPS. Doc 965/2012 is the current ops stuff. Maybe this will help (or maybe not!):
AMC1 CAT.OP.MPA.110 Aerodrome operating minima
TAKE-OFF OPERATIONS – AEROPLANES
(a) General
(1) Take-off minima should be expressed as visibility or runway visual range (RVR) limits, taking into account all relevant factors for each aerodrome planned to be used and aircraft characteristics.
Where there is a specific need to see and avoid obstacles on departure and/or for a forced landing, additional conditions, e.g. ceiling, should be specifi ed.
(2) The commander should not commence take-off unless the weather conditions at the aerodrome of departure are equal to or better than applicable minima for landing at that aerodrome unless a
weather-permissible take-off alternate aerodrome is available.
(3) When the reported meteorological visibility (VIS) is below that required for take-off and RVR is not reported, a take-off should only be commenced if the commander can determine that the visibility along the take-off runway is equal to or better than the required minimum.
(4) When no reported meteorological visibility or RVR is available, a take-off should only be commenced if the commander can determine that the visibility along the take-off runway is equal to or better than the required minimum.
(b) Visual reference
(1) The take-off minima should be selected to ensure suffi cient guidance to control the aircraft in the event of both a rejected take-off in adverse circumstances and a continued take-off after failure of the critical engine.
(2) For night operations, ground lights should be available to illuminate the runway and any obstacles.
(c) Required RVR/VIS – aeroplanes
(1) For multi-engined aeroplanes, with performance such that in the event of a critical engine failure at any point during take-off the aeroplane can either stop or continue the take-off to a height of 1 500 ft above the aerodrome while clearing obstacles by the required margins, the take-off
minima specifi ed by the operator should be expressed as RVR/CMV (converted meteorological visibility) values not lower than those specifi ed in Table 1.A.
Day only: Nil** 500
Day: at least runway edge lights or runway centreline markings
Night: at least runway edge lights and runway end lights or runway centreline lights and runway end lights 400
(2) For multi-engined aeroplanes without the performance to comply with the conditions in (c)(1) in the event of a critical engine failure, there may be a need to re-land immediately and to see and avoid obstacles in the take-off area. Such aeroplanes may be operated to the following take-off
minima provided they are able to comply with the applicable obstacle clearance criteria, assuming engine failure at the height specifi ed. The take-off minima specifi ed by the operator should be based upon the height from which the one-engine-inoperative (OEI) net take-off fl ight path can be
constructed. The RVR minima used should not be lower than either of the values specifi ed in Table 1.A or Table 2.A.
(3) When RVR or meteorological visibility is not available, the commander should not commence takeoff unless he/she can determine that the actual conditions satisfy the applicable take-off minima.