pdf document from Article 8 FRAME SAFETY attention to see all the pictures you must see Article 283
below I have pictures intersected by section 283 with section 253 carefully this is only using this document includes only the most important information for you should consult the regulations

From 01/01/2013: For cars of Groups A and T1 T1B, the reference to the date of approval shall be understood as the first date of issue of the FFSA technical passport.

            The installation of a safety cage is mandatory.
It may be either:
 a) fabricated in compliance with the requirements of the following articles;
b) Homologated or Certified by an ASN in accordance with Regulation approval for safety cage;
A certification document or certificate, approved by the ASN and signed by qualified technicians representing the manufacturer, must be presented to the evnt's scrutiners .
Any new cage homologated by an ASN and sold from 01.01.2003 must  be  identified by means of an   identification plate affixed by the manufacturer this identification plate must be neither  copied or moved (ie embedded, engraved or self sticker destroying).
The identification plate msut bear the name of the manufacturer, the homologation or cetification numberof the ASN homologation from or certificate and the individual series number of the manufactuer.
Acertificate bearing the same numbers must be carried on the board and be presented to the event's scrutiners.
c homologated by the FIA according to the homologation regulations for safety cages
it must be subject of an extension (VO)to the homolgation from of the vehicle homologated to the FIA
The manufacturer 's identification and a series number must be clearly visible on all cages homologated and sold after 01/01/1997

The homologation from  the cage must specify where and how this information is indicated, and the buyer must receive corresponding numbered certificate.
Any modification to the  homologated or certificated safety cage  is forbidden
 To be
considered as a modification any process made to the cage  p by machining, welding, that  involves a permanent modification of the material or the safety cage .
All repair of a safety cage homologated, damaged after  an accident must be made by the manufacturer of the frame or with the approval of the latter.
Tubes of safety cages must not carry fluids or anything else.
The safety cage must unduly impede  the entry or exit of the pilot and co-pilot.

Inside the cabin, the passage of the following elements between the side hull spars and the safety reinforcement is forbidden:
-Canalisations carrying fluids (except liquid washing ice)
-Canalisations the system extinction.

Members  may intrude  on the space for occupantin opassing through the dash boardand trim , as wellas trough rear the seats
The rear seats can be folded down.

8.2.1 Safety cage:
Multi-tubular structure installed in the cockpit and fitted closed to the bodyshell, the functionof which is to reduce the deformation of the bodyshell(chassis)in case of impact

8.2.2 rollbar
tubular frameforming a hoop with two mounting feet

8.2.3 main rollbar drawing (253-1)
transverse and near vertical single pièce tubular hoop located across the vehicle behind the front seats

8.2.4 front rollbar  drawing (253-1)
similar to the main rollbar but is shapefollows the windscreen pillarsand the top screen edge

8.2.5  lateral rollbar drawing (253-2)
near - longitudinal and near vertical single piece tubular hoop located along the right or the left side of the vehicule, the front pillar of wich follows the windscreen pillaer and the rear pillar of wich is ner a vetical and located just behind the front sets

8.2.6 Half-lateral rollbar (drawing 253-3):

            Identical to the lateral rollbar but without rear pillar.

8.2.7 Longitudinal member
       Near longitudinal single piece tube joining the upper parts of the
front and main rollbars


8.2.8 Transverse member
Near- transverse single piece joining the upper parts of the lateral half rollbars or of the latéral rollbars       


8.2.9 Diagonal member

Transverse tube between one of the main roobar , or one of the ends of the transverse member in tyhe case of a latéral rollbar, and a the lower mounting point on the opposable side of the rollbar.ou the upper end of backstay and the lower mounting point of the other backstay


8.2.10 Removable member
member of the safety cage which must be able to removed

  Note the mandatory France.

8.2.11 Reinforcement cage
   member added to the safgety cage to improve is strengh 
8.2.12 mounting foot
Plate welded to the end of a rollbar tube to permit is bolting to thebodyshell/chassis, usually onto a reinforcement plate .

8.2.13 Reinforcement plate:
metal plate fixed to the bodyshell/ chassis under a rollbarmounting foot to better spread the load onto the bodyshell/ chassis

8.2.14 Gusset
            Reinforcement of a bend or junction in from sheet metal with a U shape (drawing 253-34), the thickness of wich must not be less than 1.0 mm.
The ends of this gusset must be situated  at a distance from the top of the angle  of between 2 and 4 times the outher  diameterof the biggest of the tubes joined   with respect to the top of the angle.

8.3.1 Basic Structure
            The basic structure must be according to one of the   following designs:

* 1 main rollbar + 1  front  rollbar + 2 longitudinal member  +2 backstrays + 6 mounting feet (Drawing No. 253-1).
* 2 lateral rollbars + 2 transversal member + 2 backstays  + 6 mounting feet  (Drawing No. 253-2).
* 1 main roolbar  + 2 lateral half- rollbars+ 1 transverse member +2 backstays + 6 mounting feet (Drawing No. 253-3).

                                    253-1                                                           253-2                                                            

        The vertical part  of the main rollbar  must be as close as possible to interior contour of the body shell .
 The front pillar of the front
rollbar or of lateral rollbar must follow the windscreen pillars  as closely as possible and have only one bend with its lower vertical part.
in order to built a safety cage , the connections of the transverse memebers to the latéral rollbars, the connectins of the longitudinal memebers to the front and main rollbars, as well the connections of a semi - latéral rollbar to the main rollbar must be situated at the roof level.
In all cases, there must be no more than 4 removable connections at the roof level..
The backstays must be attached near the roofline and near the top outer bends of the main rollbar on both sides of the car, possibly by means of removable connections.
They must form an angle of at least 30 ° with the vertical, must ru rearwards and be straight and as close as possible to the interior side panels of the bodyshell .

8.3.2 Design:
            Once the basic structure is defined, it must be completed with compulsory members and  reinforcements  (see Article 283-, to which optional members and reinforcements may be added (see section 283- explicitly authorized and unless connections
Removable used in accordance with Article 283 -, and all spacers
tubular reinforcements must be steamers compulsory members and reinforcements: Diagonal member:

The cage must have one  diagonal  member defined by the drawings 253-4, 253-5 and 253-6. The orientation of the diagonal can be inversée.ou still drawing 253-7
In the case of drawing 253-6, the distance between the two mounting to the bodyshell / chassis must not be greater than 400 mm.
Members must be straight and may be removable.
The upper end of the diagonal must join the main rollbar no further than 100 mm from its junction with the backstays , or  the backstays no more thanr 100 mm from its junction with the main rollbar (see drawing 253-52 for the measurement).
· The lower end of the diagonal must join the main rollbar or the  backstay no further than  100 mm from the mounting  foot (except in the case of drawing 253-6).
    drawings 253-6 for only  groups T1A ET T1B and 253-7 for cars all  homologated since 01/01/2008 doorsbars :
At least one longitudinal strut is to be fitted on each side of the vehicle on the door (see drawing 253-8).
(S) tube (s) constituting the reinforcement must built into the rollcage and  its (their) angle with the horizontal tube must not exceed 15 ° (angled downwards and towards the front).
The latéral protection must be as high as possible, and if it comprises  of a single bar, at least 10 cm from the bottom of the seat, but in all cases its upper attachment points must be either than half   the total height of the door measured from the base.
If these upper attachment points are located in front of or behind the door opening, this height limitation is also  valid for the corresponding intersection of the strut  and the door opening.
In the case of doorbar in the form an "X" (drawing 253-9), it is recommended that the lower attachment points of the cross- struts be fixed directly onto the longitudinal memberof the bodyshell (chassis) and at least part of the "X" be one single  piece.
Connection of the  doorbars to rhe windscreen  pillar reinforcement  (drawing 253-15) is permitted.
For competitions without co-pilot, the member can be mounted only on the driver side. Transverse member  (drawing 253-29):

The transverse member fixed to the front rollbar is compulsory but it must not encroach upon the space reserved for the occupants.
It must be straight.
It may be placed as high as possible but its lower edge must not be higher then the uppermost point  of the dashboard.
For cars homologated as from 01/01/2007, it must  be located below the steering column. Roof reinforcement:
          Cars registered before 01/01/2007
The upper part of the rollcage must conform to one of the drawings 253-12 , 253 -
13 , 253-14 , 253-23 , 253-24 .
Homologated as from 01/01/2007 only car:
The upper part of the rollcage must conform to one of the drawings 253-12 , 253 -
13 and 253-14 .
Reinforcements may follow the curve of the roof.
For competitions without co-pilot , in the case of drawing 253-12 only, one
diagonal brace may be fitted but its front connection must be on the side of the driver.
The ends of the reinforcements must be less than 100 mm from the junction between the
rollbars and (not applicable to the apex of the V formed by the reinforcement drawings 253-13
and 253-14 ) .
Cars homologated as from 01/01/2014
Joining of the top of tubes V : If the tubes are not contiguous , the distance between
they must not be greater than 100 mm at their junctions with the rollcages  or
the crossbeam . windscreen pillar reinforcement :
for cars homologated since 01/01/2007

            It must be mounted on each side of the front rollbar (drawing 253-15).
It may be bent on condition that it is straight in a side view and the angle of the bend does not exceed 20 °.
Its upper end must be less than 100 mm from the junction between the front  (lateral) rollbar  and longitudinal (transverse)member .
Its lower end must  be less than  100 mm from the front mounting  foot (front) of the front  lateral rollbar  (see drawing 253-52 for the measurement). Diagonal strut rear (253-20 and 253-21 drawing):
Configuration drawing 253-21 may be replaced by drawing 253-22 if a reinforcement
roof according to drawing 253-14 used. Reinforced corners and junctions:
            The junctions between:
- The diagonal member of the main rollbar,
- The roof reinforcements (253-12 and configuration drawing only cars homologated as from 01/01/2007)
- The doorbars (configuration drawing 253-9),
- The doorbars and pillar reinforcement windscreen  (drawing 253-15) must be reinforced by a minimum of 2 gussets complying with Article 283-8.2.14.
If the  doorbars and windsreen  pillar reinforcement  are not located in the same plane, the reinforcement may be made of fabricated sheet metal , provided it  comply with the requirement of Article 283-8.2.14 dimensions. optimal member and reinforcements

  Except other indications given in Article 283-, member  and reinforcement shown on the drawings 253-12 to 253-14, 253-16 to 253-19, 253-21, 253-23 to 253-28 and 253 -30 to 253-33 are optional and can be installed at the discretion of the manufacturer.
The reinforcing tubes must be straight.
They must be either welded or installed by means of  through removable connections.
All members  and reinforcements mentioned above may  be used separately or combined with one another. Backstays diagonal  (drawing 253 20and 253 21):
Configuration drawing 253-21 may be replaced by drawing 253-22 if a roof reinforcement complying to drawing 253-14 is used.


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