Main Contractor Works

For every Sesame system, there are a range of procedures that may need to be put in place on each possibility to allow a fully compliant Sesame system according to British Standards BS 6440:2011.

The power requirements for the lift is a 240v, 13amp, single phase supply supplied from a type C or D motor rated breaker Commando Socket. If the position of the Power Supply is located within the Sesame Pit, a Commando Socket is not required, however the power supply will need to be flush mounted within the pit walls. The power supply will be supplied by the main contractor.

Sesame will provide the space requirements for the lift; it would then be down to the main contractor and the architects to form a pit to support the Sesame system and the surrounding area, staircase, handrails etc. The pit will require drainage. The pit will need to be made ready to accept the Sesame pit trim prior to the lift being installed. Fire proofing of the pit is also the responsibility of the main contractor. The pit needs to be built structurally ready to accept the weight of the Sesame Lift System.

The main contractor would clad the Sesame lift under Sesame engineers supervision. Sesame will issue a cut list for the risers and the treads to be fitted to the sesame lift. A flexible adhesive must be used to fix the treads and risers to our steel steps. We generally specify Bond It PU18

The main contractor will form cut outs for the Sesame upper and lower landing button stations, with one conduit 32mm from the button stations to the Machine room or two conduits each 25mm from the button stations to the Machine room located in the basement. The main contractor will also form a 100mm core drill conduit run from the lift pit to the Machine room.

The Sesame lift will need to control the automatic upper landing door. The lift will tell the door to open and close. The door must tell the Sesame lift that it is locked closed and open. Sesame can quote for the door actuator if necessary to keep the package under one roof, however this is not essential but the supplier of the actuator must be confirmed prior to Sesame issuing a final quote as this detail can be time consuming when a new company is involved.

It is important that Sesame speak to the fire officer on this site to assess the safest way of installing a Sesame lift if it is in a fire escape route.

Sesame can supplying a UPS battery backup that will run the lift 5 times in the event of a fire which will allow a member of staff to lower the lift to remove any wheelchair users using the lift during a fire and return the lift to a set of stairs. It is important to note that the lift should not be used in the event of a fire (unless someone is on the lift as the alarm goes off) so alternative means of escape for wheelchair users must be planned. For example an evac chair.

The fire officer may specify alarms to sound from the Sesame system if the fire alarm goes off when the lift is in use.

There may also be the requirement for an internal flashing sign to tell people inside the building that the lift is in use.

It is important that the upper landing door is released from the Sesame lifts control in the event of a fire to allow for independent exit.

Importantly the building must have procedures in place to allow for the unlikely event of the Sesame lift being in use when the fire alarm goes off. Generally a member of staff will need to check the lift is at the stairs at rest position, if it is not, then the staff member will need to return it to stairs “In Safe Mode” to allow pedestrians to escape the building.

The main contractor will need to mark out grid lines and datum levels local to the lift pit to enable Sesame engineers to position the lift correct to the drawings. Once the lift is positioned the Main contractor will need to sign off the location.

The main contractor will need to make good the surrounding area up to the Sesame system. Where applicable the side profile of the permanent stairs that is exposed when the Sesame stairs retract will need to be finished by plaster and painting or to whatever specification the architect recommends.

Where applicable upper landing light beams are needed to detect the presence of a pedestrian standing between the upper landing closed door and the top step riser. This is only necessary if the distance between the closed upper landing door and the top step riser is larger than 100mm. The main contractor will need to allow for conduit routs to the machine room from the light beams if they are used.

The surrounding walls that the lift passes must be flush and plumb. Any plaster work must not present any bulges for example. If there are crush zones (that cannot be moved for listed building reasons for example) highlighted during the design phase then Sesame can add safety strips to the lift to protect the user. This cannot be added once the lift is manufactured.

The Sesame lift sits 8mm from its surrounding wall, if the gap becomes greater than 10mm when the lift travels this will create a finger trap. Likewise if the gap gets smaller it can snag.

British Standards BS6440:2011 states that any protrusion greater than 1.5mm on a surrounding wall is a crush zone.

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