How Is a YGİS Contract Structured? Scope and Process

When a YGİS proposal lands on your desk, it usually comes down to a single price line and a handful of generic phrases — "periodic maintenance," "fault response," "reporting." These three words can mean entirely different things in two providers' proposals. One might offer a single site visit per year while another performs monthly measurement and thermal scanning; one might say "we'll come when needed" while another commits a written response time in the contract. The only way to see this difference is to read the contract's scope line by line. This article covers what a YGİS contract should actually cover, how the process unfolds step by step, the factors that determine pricing, and the warning signs you shouldn't ignore when evaluating a proposal.

What a YGİS Contract Is, and Why It Must Be Written

A High-Voltage Operating Responsibility (YGİS) contract is the service agreement under which an EMO-registered engineer takes on responsibility for operating a facility's medium-voltage system in compliance with regulation. This responsibility is tied to the utility and relevant authorities through the engineer's personal signature, under the Power Installations Regulation (EKAT) and OHS Law No. 6331. Verbal agreements or a one-page proposal letter don't clarify the scope of this responsibility — when an accident or audit raises the question of "what was included, what wasn't," the answer comes from the contract text. That's why a YGİS relationship should rest on a written contract that clearly defines scope, frequency, and obligations — not just for legal protection, but so both sides work from the same expectations.

The Core Services a Contract Should Cover

A YGİS contract typically includes the following components:

• Formal appointment and registration: official notification of the responsible engineer to the utility and relevant authorities.
• Periodic maintenance: regular inspection of MV cells, the substation, and the protection system.
• Measurement services: earthing resistance measurement, insulation testing, thermal camera scans.
• Protection relay checks: verification and, when needed, updating of relay settings.
• Reporting: a written, dated report after each visit and measurement.
• Fault response: on-site response in the event of an unexpected outage or fault.
• Audit preparation: documentation and site checks ahead of OIZ or utility audits.

Each item should be defined separately; instead of vague phrases like "general maintenance service," the contract should specify which equipment is checked, at what frequency, and by what method.

How the Contracting Process Works

1. Preliminary survey: the engineering team reviews the existing MV system, equipment age, past maintenance records, and any prior YGİS reports, ensuring the proposal is built on a realistic scope.
2. Defining scope and frequency: maintenance frequency, measurement scope, and reporting schedule are clarified based on the assessment.
3. Proposal and contract draft: scope, responsibilities, response-time commitments, and duration are written down clearly.
4. Formal appointment: once signed, the responsible engineer's appointment is formally reported to the utility and relevant authorities.
5. Commissioning: the service begins with an initial site visit, baseline measurements, and a current-state report.
6. Ongoing operation: maintenance, measurement, and reporting continue per the schedule; in a fault, response follows the committed response time.

This typically takes a few weeks, though it varies with facility size and the state of existing documentation. For a newly built substation, the process naturally follows on from substation setup, beginning after provisional acceptance.

Factors That Affect Scope and Pricing

The scope of a YGİS service, and the cost that follows from it, isn't set by a fixed rate card — it's determined by variables specific to the facility. Understanding how these are evaluated before you get a quote helps you compare proposals meaningfully:

• Facility size and load profile: a larger MV system means more cells, more measurement points, and longer site visits.
• Equipment age and condition: an older substation, or one where maintenance has been neglected, may require a more intensive initial assessment and more frequent measurement.
• Visit frequency: choosing a monthly, quarterly, or annual maintenance schedule directly affects both cost and how well the service fits the facility's risk profile.
• Criticality level: a facility running continuous production doesn't need the same response-time commitment as a single-shift workshop.
• Geographic location: how often site visits occur and how quickly emergency response happens depends on whether the facility sits inside or outside an OIZ.
• State of existing documentation: if past measurement records are well organized, the initial assessment is shorter; if records are missing, extra work may be needed upfront.

These factors should be discussed and reflected in the proposal before any concrete figures are given. A fixed price quoted without a site visit is a sign the scope hasn't been realistically evaluated.

Clauses That Must Be in the Contract

A YGİS contract should contain the following clauses, stated clearly and measurably:

1. Response-time commitment: the time to reach the site from a fault notification should be written in hours. Phrases like "as soon as possible" are not an auditable commitment.
2. Maintenance schedule: which equipment is checked, in which month, and by which method should be listed explicitly.
3. Reporting frequency and format: the contract should state that a written report is delivered after every visit, and what measurements and findings it will include.
4. Out-of-scope work: what the contract does not cover (e.g., major repairs, equipment replacement) should be stated explicitly — otherwise, disputes over "this is out of scope" arise at the worst possible moment, during a fault.
5. Handover procedure: the notification period and transition process should be defined for the case of an engineer change.
6. Contract duration and renewal terms: duration, automatic renewal conditions, and the notice period for termination should be clear.
7. Communication protocol: who to call in an emergency and through which channel (phone, email, field team) should be defined.

Maintenance Schedule and Reporting Discipline

Maintenance frequency is set based on the facility's load profile, equipment age, and the intervals prescribed by regulation, but the contract needs to tie this schedule to concrete dates and checklists. Every visit should check and document: the general condition of MV cells, thermal scanning of connection points, earthing resistance measurement, verification of protection relay settings, and any signs of abnormal heating or partial discharge. Reporting discipline matters not just to build an archive, but to prove the facility's continuous compliance during audits. Irregular or poorly documented maintenance is little different from maintenance that was never performed — work that can't be proven doesn't count under regulation.

Emergency Response and Response-Time Commitments

The moment a fault occurs is when the contract is tested most concretely — can the YGİS engineer actually be on site. A service without a written response-time commitment operates, in practice, on a "we'll get to it" basis, which extends outage duration and raises safety risk. A well-structured contract clarifies the emergency notification channel, initial response time (phone-based assessment), physical time to reach the site, and the backup-personnel procedure that kicks in if the primary engineer is unreachable. Local field presence is decisive — a remotely managed contract doesn't help during a fault that requires physical intervention on an MV system.

Contract Duration, Renewal, and Termination Terms

YGİS contracts are typically structured in one-year terms with an automatic renewal clause. The contract should be clear on: the notification period before renewal, the written notice period required for termination, and how a gap in responsibility is avoided in the event of termination. A YGİS responsibility can never be left "vacant" — until the formal handover between the outgoing and incoming responsible engineer is complete, the facility is effectively without a registered responsible party in the eyes of the utility. A good contract therefore provides for a reasonable transition period during termination.

Red Flags to Watch for When Evaluating a Proposal

Watch for the following warning signs when evaluating a YGİS proposal:

• A fixed price quoted without a site visit: a sign the scope hasn't been realistically assessed.
• No written response time in the contract: a service that can't be held to an emergency commitment.
• Vague reporting format: ask for written documents with measurement values, dates, and findings — "we'll provide a report" isn't enough.
• Unverifiable EMO registration: the legal validity of the responsibility depends on it.
• A one-person team: no backup capacity for leave, illness, or unreachability puts continuity at risk.
• No references or active contracts to show: particularly no presence in OIZs in your region, which may indicate limited field experience.
• Out-of-scope work left undefined: raises the risk of unexpected extra charges during a fault.

More than one of these signs together is reason enough to reconsider the proposal.

How a YGİS Contract Relates to Overall Operating Responsibility

A YGİS contract is only one part of a facility's overall electrical safety strategy, but when properly structured it forms the framework for everything else — audit preparation, earthing measurement, fault response. For a broader look at what YGİS is and why it's mandatory, see our YGİS Bursa guide, or review our MV Operating Responsibility service page.

Common Mistakes

• Treating the contract as a one-page proposal letter: a document without scope, frequency, and response-time clauses offers no protection when a dispute arises.
• Deciding on price alone: the lowest bid usually hides the narrowest scope, the least frequent visits, or the weakest response-time commitment.
• Not asking about out-of-scope work: post-fault surprises like "that's out of scope, extra charge" stem from this clause never being clarified upfront.
• Not verifying EMO registration: the legal validity of the responsibility depends directly on this registration; skipping it is a serious risk.
• Terminating a contract without planning the handover: ending the old contract before the new responsible engineer is formally appointed leaves the facility in a temporary responsibility gap.
• Not archiving reports: being unable to access past maintenance records during an audit calls into question even the work that was actually done.

FAQ

How long does it take to set up a YGİS contract? The process from facility assessment to formal appointment typically takes a few weeks; the exact duration depends on facility size and the state of existing documentation.

Can the contract scope be changed later? Yes — as the facility's needs change (capacity increase, new equipment, additional buildings), maintenance frequency and scope can be renegotiated and updated.

What determines the price? Facility size, equipment age, visit frequency, criticality level, and the state of existing documentation — there's no fixed, one-size-fits-all rate.

Which clauses must be in the contract? Response-time commitment, maintenance schedule, reporting frequency, out-of-scope work, the handover procedure, and termination terms must all be in writing.

How should multiple proposals be compared? Not just on price — compare visit frequency, response-time commitment, reporting format, EMO registration, and team capacity.

Can a contract be terminated before its term ends? Usually yes, but the written notice period and the handover process to a new responsible engineer must be defined in the contract.

Does a small facility need a separate contract too? Yes — regardless of facility size, any facility with its own substation requires a YGİS appointment and a corresponding written contract.

When should the contract be arranged for a newly built substation? Utilities often require the YGİS appointment before energization, so the contract should be prepared in parallel with the provisional acceptance process.

Conclusion

A YGİS contract isn't a formality — it's the operational document that defines a facility's electrical safety and legal compliance. A contract with clear scope, a written response-time commitment, and defined reporting discipline is real protection during both audits and faults. Reading the scope before the price is how you manage cost and risk more accurately over the long term.