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Permus  (1982 - ?)
Strand


Permus dimmer rack

Developed from Tempus dimmers
Permus Dimmer Racks, embodying Permus Thyristor dimmer modules, are the economic power-handling component for permanent, hard-wired lighting control systems. These shallow racks require only front access, plus top access for the electrical contractor, and can be mounted against a wall, or mounted back to back; either method ensures that only the very minimum of valuable floor space is required.

Dimmer Modules
The rugged and reliable Permus dimmer modules incorporate a temperature-stable trigger card with hard firing on each pair of tungsten surge-rated Thyristors mounted on generous heat-sinks. Hard-firing ensures stable operation on loads as low as 40 watts and for transformer-fed lamps. A new transfer characteristic has been incorporated to give increased control sensitivity, and improved standards of reliability, and safety, are ensured by elimination of the bottom-set potentiometer.

Dimmer Racks
The standard width Permus racks, stocked and ready for despatch, are already fitted with either 24 x 10A dimmers in twin module format, or alternatively 12 x 20/25A single dimmer modules. For maximum flexibility of the total number of dimmer channels, and to allow mixed ratings in a multiple rack installation, there is also a narrower rack available housing either 12 x 10A, or 6 x 20/25A dimmers. All Permus dimmer racks employ natural air flow ventilation, are available with either Reyrolle or Neozed close-excess current protection, and are internally wired for a three phase and neutral incoming supply. Provision is made to allow each two adjacent dimmer modules (4 x 10A) to be changed, on site, to a different phase, or to change to a single phase and neutral supply.

Tempus Control Desks
For use with Tempus desks a power supply unit needs to be added to one Permus rack and twin or quad control socket boxes are necessary to receive the plug-terminated flexible cable for each block of 6 channels.

From Rank Strand information leaflet "Preset Lighting Controls and Dimmers"

Related Venues:

See also:


Documents


Environ Fluorescent Dimming 
[836kb PDF]
From Jim Laws Collection

Permus Dimmer Racks datasheet (1982)
[1.5Mb PDF]
From Strand Archive

Preset Lighting Controls and Dimmers brochure (1982)
[3.6Mb PDF]
From Strand Archive

Permus Dimmer Racks datasheet (1984)
[1.7Mb PDF]
From Strand Archive

Permus Maintenance Handbook (1988)
[8.3Mb PDF]
From Mervyn Gould Collection

Strandbook - Permanent Dimmer Racks (1989)
[External Website]

1992 Insight Brochure - Page 2 (May 1992)
From Strand Archive

Catalogue & Journal Entries for Permus in the Backstage Heritage Collection


Product News: Stand Introduce New Electronic Dimmers (1982)

Permus - A New Range of Dimmers (1982)

Advert: Strand Lighting at the new Swan Theatre (1986)

Price List (1989)

Heathrow Project Takes Off (1990)

The Galaxy Looks Grand in Swansea (1990)

Dimmers and Control Systems (1990)

Back to Dimming and Multiplex (Strand)


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