Supply and delivery of six 44 kv metal-oxide gapless surge arresters for PRASA traction substations

Scope: appointment of a contractor to supply and deliver six metal-oxide gapless surge arresters for installation on the 44 kV incoming supply of a 3 kV DC traction substation, protecting high-voltage equipment against lightning and switching overvoltages.

Delivery address: Metrorail Electrical Depot, 1 Store Road, Germiston.

Key technical parameters: 44 kV nominal system voltage; 42 kV rated voltage (Ur); 33.6 kV continuous operating voltage (Uc); 10 kA nominal discharge current (8/20 μs); 100 kA high-current impulse (4/10 μs); Line Discharge Class 2; 40 kA pressure-relief capability; TOV 1s 48.3 kV; TOV 10s 45.7 kV; residual voltage steep current impulse 123 kV; residual voltage 10 kA lightning impulse 111.8 kV; residual voltage 500 A switching impulse 90.8 kV.

Compliance: Transnet Freight Rail BBB0845 and SANS 60099-4; suitable for effectively earthed system.

Quality: PRASA may reject non-conforming material; works quantified with PRASA assistance; payment against tendered rates.

Contractor obligations: all transport, equipment, tools, consumables, supervision, protection, and labour; liability for damage to PRASA, employee, or third-party property.

Handover: per portion upon testing and commissioning to Technical Manager's satisfaction, per PRASA handing-over documentation.

Closing date and time: 16 October 2026 at 10:00

No briefing, site visit, or clarification deadline stated in the document.

No named SCM or technical contacts stated in the document.

Delivery address:

Metrorail Electrical Depot

1 Store Road

Germiston

Returnable documents:

• Requirements as per the technical functionality (organisational experience and delivery commitment evidence)

Submission method: not stated in the document — bidders must confirm channel with PRASA SCM

Closing: 16 October 2026 at 10:00

Disqualification risks:

• Failure to submit technical functionality schedules
• Incomplete or unsubstantiated project experience claims
• Delivery commitment letter missing or not on company letterhead
• Unsigned or unauthorised submissions

Technical functionality evaluation (100 points total, minimum 70 to proceed)

Organisational Experience — 50 points

• Based on successfully completed similar projects (supply and/or installation of surge arresters) within 5 years
• Scoring: 0 projects = 0; 1 project = 10; 2 projects = 20; 3 projects = 30; 4 projects = 40; 5+ projects = 50
• Required evidence per project: appointment letter on company letterhead, project description, client name, client contact (email and telephone), start date, end date, extension of time if applicable, contract value inclusive of VAT
• Also required: completion certificate signed by client, or client letter confirming successful completion

Delivery Commitment — 50 points

• Letter on company letterhead, signed by duly authorised official, committing to delivery period
• Scoring: delivery period > 4 weeks = 10 points; delivery period ≤ 4 weeks = 50 points
• No information provided = 0 points

Minimum qualifying score: 70/100

Scope: supply and delivery of six (6) metal-oxide gapless surge arresters for 44 kV incoming supply of a 3 kV DC traction substation

Purpose: protect high-voltage equipment against lightning and switching overvoltages

Technical parameters:

• Nominal system voltage: 44 kV
• Rated voltage (Ur): 42 kV
• Continuous operating voltage (Uc): 33.6 kV
• Nominal discharge current: 10 kA (8/20 μs)
• High-current impulse: 100 kA (4/10 μs)
• Line discharge class: Class 2
• Pressure relief capability: 40 kA
• Temporary overvoltage (TOV) 1 second: 48.3 kV
• TOV 10 seconds: 45.7 kV
• Residual voltage — steep current impulse: 123 kV
• Residual voltage — 10 kA lightning impulse: 111.8 kV
• Residual voltage — 500 A switching impulse: 90.8 kV

Standards compliance: Transnet Freight Rail BBB0845 and SANS 60099-4

System type: effectively earthed

Quantity: 6 units

Delivery location: Metrorail Electrical Depot, 1 Store Road, Germiston

Quality assurance:

• PRASA may reject material not meeting specifications
• Contractor to quantify works with PRASA assistance; payment subject to tendered rates
• Handover when Electrical System tested and commissioned to satisfaction of Technical Manager

Organisational Experience requirement: evidence of successfully completed similar projects (supply and/or installation of surge arresters) within 5 years.

Required documentation per project:

• Appointment letter on company letterhead
• Project description
• Client name
• Client contact: email and office telephone
• Project start date and end date
• Extension of time if applicable
• Contract value inclusive of VAT
• Completion certificate signed by client, or client letter confirming successful completion

Scoring: 0 projects = 0 points; 1 = 10; 2 = 20; 3 = 30; 4 = 40; 5+ = 50. Weight: 50 points.

Delivery commitment: letter on company letterhead, signed by duly authorised official, stating delivery period commitment. Scoring: > 4 weeks = 10 points; ≤ 4 weeks = 50 points. No information = 0. Weight: 50 points.

Minimum to proceed: 70/100.

Bill of Quantities item: Supply and delivery of 44 kV metal-oxide gapless surge arrester, 42 kV Ur, 33.6 kV Uc, 10 kA, Class 2 — Each, quantity 6.

Pricing: unit cost and total cost per item; total excluding VAT; VAT at 15%; grand total inclusive of VAT.

Rates: firm, fixed, all-inclusive per unit; no escalation permitted; used for final payment calculation.

Payment: monthly; preliminaries prorated to work executed; progress assessed jointly; VAT invoice with Progress Assessment Certificate.

Pricing format: firm, fixed prices for duration of contract; all-inclusive per-unit rates in Bill of Quantities

Bill of Quantities:

• Item: Supply and delivery of 44 kV metal-oxide gapless surge arrester (42 kV Ur, 33.6 kV Uc, 10 kA, Class 2)
• Unit: Each
• Quantity: 6
• VAT: 15%

Payment terms:

• Monthly claims for payment
• Payment for fully functional equipment only
• Rejected material not paid
• No escalation claims permitted at any stage
• Preliminaries prorated to value of work executed
• Progress assessed by Supervisor and Contractor together; Progress Assessment Certificate issued
• Contractor submits VAT invoice with Progress Certificate attached
• Electronic payments — contractor must provide banking details

Penalties:

• Delay: 0.05% of Contract Price per delayed day per order (clause 12.1)
• Alternative/delay reference (clause 4.3): 0.3% of Contract Price per delayed day per order
• Maximum penalty cap: 10% of Contract Price
• PRASA may set off penalties against fees due

Contract period: inclusive of 12-month delivery and warranty period

Servicing costs: stated separately, paid quarterly for service period

Financial capacity:

• Contractor liable for damage to PRASA property, employee property, or third-party property
• Contractor provides all transport, equipment, tools, consumables, supervision, protection, and labour

Safety and operational compliance:

• Valid driver's licences and Public Driver's Permits (PDP) for all drivers where applicable
• Valid Crane Operator's certificate for crane operators
• All vehicles roadworthy
• Protective clothing and equipment for all employees
• Suitable harnesses for employees climbing structures
• Security of personnel and material on site and during transit

Safety plan:

• Detailed safety plan required before site access certificate issued
• Compliance: latest OHS Act, SPK7, and E4E

Work standards:

• E7/1 Specification compliance
• Protection Manual measures
• Safety procedure for approaching rail traffic: compiled by Contractor, implemented before work commences, updated and communicated as needed

Subcontracting:

• Prior written permission from Project Manager required for any subcontractor

No explicit B-BBEE, CIDB, CSD, tax clearance, or local content thresholds stated in the document — bidders should verify with PRASA SCM whether standard PRASA compliance requirements apply.

Safety legislation: full compliance with all safety laws and regulations.

Personnel certifications: valid driver's licences and PDPs for drivers; valid Crane Operator's certificate for crane operators; roadworthy vehicles.

Protective equipment: contractor provides all protective clothing and equipment; climbing harnesses for structure-climbing employees.

Security: contractor responsible for personnel and material security on site and in transit.

Standards: E7/1 Specification; Protection Manual measures.

Rail traffic: contractor compiles and implements safety procedure for approaching rail traffic before work starts; updates and communicates changes to all employees before proceeding.

Safety plan: detailed plan required before site access certificate issued; compliance with latest OHS Act, SPK7, and E4E.

Pricing: firm, fixed rates for contract duration; all-inclusive per-unit rates in schedule of quantities; no escalation permitted.

Contract period: inclusive of 12-month delivery and warranty period.

Servicing: costs stated separately, paid quarterly for service duration.

Payment: monthly claims; fully functional equipment only; rejected material unpaid; preliminaries prorated to work executed; progress assessed jointly by Supervisor and Contractor; VAT invoice submitted with Progress Assessment Certificate; electronic payment via contractor-provided banking details.

Penalties: 0.05% of Contract Price per delayed day per order (clause 12.1), alternative reference 0.3% (clause 4.3); maximum 10% of Contract Price; PRASA may set off against fees; penalties do not relieve completion obligations.

Liability: contractor bears cost of claims for damage to PRASA property, employees, or third parties.

Subcontracting: prior Project Manager permission required.

Handover: per portion upon Electrical System testing and commissioning to Technical Manager satisfaction.

Subcontracting restriction: contractor may not use any subcontractor for works or any part thereof without prior written permission from the Project Manager.

Technical functionality — 100 points total, minimum 70 to proceed to next stage.

Organisational Experience (50 points): score based on similar surge arrester supply/delivery/installation projects completed within 5 years. Scoring: 0 projects = 0; 1 = 10; 2 = 20; 3 = 30; 4 = 40; 5+ = 50. Required per project: appointment letter on company letterhead, project description, client name, client contact (email and telephone), start date, end date, extension of time if applicable, contract value inclusive of VAT. Completion certificate or client confirmation letter required.

Delivery Commitment (50 points): letter on company letterhead, signed by authorised official, committing to delivery period. Scoring: > 4 weeks = 10 points; ≤ 4 weeks = 50 points; no information = 0.